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April 10, 2014
Actual Radio Frequencies (Hz):
| 80m | 40m | 20m | |
| W100AW/5 | 3,598,137.74 | 7,058,632.37 | 14,121,135.32 |
W100AW/5 All (<=1 Hz):
AA6LK, AA8K, AB4RS, AC0ZG, AF9A, AG6SV, K0MZ, K0PF, K3KO, K4CXX/4, K5CM, K5RKS, K5XL, K6APW, K6BZZ, K6OQK, K7HIL, K8CT, KD7F, KF4BQ, KF4MH, KG6HSQ, KK4BJV, KM6QX, KN4ZQ, KV6O, N2GL, N3FG, N5DM, N7AIG, N7EP, VE2IQ, VE3OAT, W0HBK, W2FD, W3DAD, W3JW, W4GO, W4JLE, W4UK, W6OQI, W7CQ, W7MOT, W7PUA, W8DPK, W9TJ, W9ZB, WA1ABI, WA2DVU, WA4FJC, WA9VNJ, WB0LXZ
W100AW/5 80 (<=1 Hz):
AA6LK, AA8K, AB4RS, AC0ZG, AE8I, AF6SN, AF9A, AG6SV, AI6RE, K0ANS, K0BJB, K0MZ, K0PF, K1GGI, K3KO, K4BSD, K4CXX/4, K5CM, K5RKS, K5XL, K6APW, K6BZZ, K6IQL, K6OQK, K7HIL, K8CT, KC0FNS, KD2BD, KD5MMM, KD7F, KF4BQ, KF4MH, KF5KEL, KG0HY, KG6HSQ, KI0LS, KK4BJV, KK5J, KM6QX, KN4ZQ, KV6O, N2GL, N3FG, N4AU, N5DM, N7AIG, N7EP, N9MVO, N9YKE, VE2IQ, VE3OAT, W0HBK, W0WCA, W1DOC, W2FD, W2KKJ, W3DAD, W3JW, W4ENN, W4GO, W4JLE, W4PH, W4UK, W4WJ, W4YXU, W5LAC, W6BM, W6OQI, W7CQ, W7JWM, W7KPZ, W7MOT, W7PUA, W8DPK, W9TJ, W9ZB, WA1ABI, WA2DVU, WA4FJC, WA6RZW, WA7KMR, WA9VNJ, WB0LXZ, WB8EVI, WK0I
W100AW/5 80 (>1 to <=5 Hz):
AA7OO, AE7XC, K6DSW, K8DJR, K9QHO, KC8IMB, KE4PT, N0XC, N3CRM, N5LUL, N8OQ, W2EMN, W9HLY
W100AW/5 80 (>5 to <=10 Hz):
WA6VPJ
W100AW/5 80 (>10 Hz):
K4BYN, K6YAZ, K9QJS, KI4FW, KK6JTL, KU4PY, N2GX, N2QLQ, N8PXW, VE2XL, VE3GTC, W2IY, W7BDB, WA6ZTY, WB0OEW, WR5J
W100AW/5 40 (<=1 Hz):
AA6LK, AA8K, AB4RS, AC0ZG, AE7XC, AF9A, AG6SV, K0MZ, K0PF, K1GGI, K3KO, K4BSD, K4CXX/4, K5CM, K5RKS, K5XL, K6APW, K6BZZ, K6OQK, K7HIL, K8CT, K8DJR, KD2BD, KD5MMM, KD7F, KE4PT, KF4BQ, KF4MH, KG6HSQ, KK4BJV, KK5J, KM6QX, KN4ZQ, KV6O, N0XC, N2GL, N3FG, N5DM, N7AIG, N7EP, N8OQ, N9MVO, VE2IQ, VE2XL, VE3GTC, VE3OAT, W0HBK, W0WCA, W1DOC, W2FD, W3DAD, W3JW, W4GO, W4JLE, W4UK, W5LAC, W6OQI, W7CQ, W7MOT, W7PUA, W8DPK, W9HLY, W9TJ, W9ZB, WA1ABI, WA2DVU, WA4FJC, WA9VNJ, WB0LXZ, WB6BNQ
W100AW/5 40 (>1 to <=5 Hz):
AA7OO, AF6SN, K6DSW, KC8IMB, W4WJ, WB8EVI
W100AW/5 40 (>5 to <=10 Hz):
N3CRM, W2EMN, WA6VPJ
W100AW/5 40 (>10 Hz):
AE8I, KC0FNS, KI0LS, KI4FW, KK6JTL, N2QLQ, N5LUL, N8PXW, SV8QG, W4ENN, W7BDB, W7KPZ, WA6ZTY, WB0OEW
W100AW/5 20 (<=1 Hz):
7L4IOU, AA6LK, AA8K, AB4RS, AC0ZG, AE7XC, AF9A, AG6SV, AI6RE, K0MZ, K0PF, K3KO, K4CXX/4, K5CM, K5RKS, K5XL, K6APW, K6BZZ, K6OQK, K6YAZ, K7HIL, K8CT, K8DJR, K9QJS, KC0FNS, KC8IMB, KD7F, KF4BQ, KF4MH, KF5KEL, KG0HY, KG6HSQ, KI0LS, KK4BJV, KM6QX, KN4ZQ, KV6O, N0XC, N2GL, N3FG, N4AU, N5DM, N7AIG, N7EP, N8OQ, N9YKE, SV8QG, VE2IQ, VE3GTC, VE3OAT, W0HBK, W2EMN, W2FD, W2KKJ, W3DAD, W3JW, W4ENN, W4GO, W4JLE, W4UK, W4YXU, W6BM, W6OQI, W7CQ, W7JWM, W7KPZ, W7MOT, W7PUA, W8DPK, W9HLY, W9TJ, W9ZB, WA1ABI, WA2DVU, WA4FJC, WA6RZW, WA7KMR, WA9VNJ, WB0LXZ, WB6BNQ
W100AW/5 20 (>1 to <=5 Hz):
AA7OO, AE8I, AF6SN, K0ANS, K1GGI, K4BSD, K4BYN, K6DSW, K9QHO, KD5MMM, KE4PT, KK5J, W4WJ, W5LAC, WK0I
W100AW/5 20 (>5 to <=10 Hz):
N2GX, N3CRM, WB8EVI
W100AW/5 20 (>10 Hz):
KD7TUN, KI4FW, KK6JTL, KU4PY, N2QLQ, N5LUL, VE2XL, W0WCA, W1DOC, W2IY, W7BDB, WA6VPJ, WA6ZTY, WB0OEW, WR5J
Result Details (n=119):
| Call | QTH | Area | Method/Soapbox | |||||||||
| 7L4IOU | DX | DX |
| Method: Softrock sdr, Spectrum Lab Soapbox: nice signal but QRM from domestic SSB stations tnx & 73, Hisami | ||||||||
| AA6LK | CA | W6 |
| Method: HP Z3805A 10MHz GPSDO, Marconi 2019 HF synth, HP 3325A LF synth, HP 54601A o'scope, FT-847 in AM/narrow mode,5BTV and 75M dipole antennas, Vista laptop running SpecLab, DigiPan for spotting, EZGPIB controlling Prologix USB-GPIB to set up and interrogate instruments, GPSCon for monitoring Z3805A; the 2019 was set to inject a reference beat signal to produce a ~400Hz beat tone, and the 3325A was tuned for minimum phase slip between it and the beat tone. Each run was
recorded to a .wav file through SpecLab, and at a later time replayed to export data to spreadsheet to refine submission numbers. Soapbox: Thanks to K5CM for running another fine event. All signals were easily heard but each had up to 1 Hz spreading due to rapid multipath changes. 73, L | ||||||||
| AA7OO | AZ | W7 |
| Method: Radio: (SDR) SDRStick HF2 DDC Receiver
Computer: ASUS AC-N56RJ
Software: (SDR) HDSDR
Software: (Audio) SpecLab
Network: Netgear 1GB Switch, 1GB ASUS AC-RT66R Router
Antenna: Scorpion mounted at 8ft with elevated ground plane.
10MHz standard Trimble GPS DO
Variable Signal Gen Motorola R-2600, E-12 with External GPS DO
Method:
Set R2600 Gen less than 2khz below expected FMT freq. Using HF2, recorded 1.7Mhz of RF band centered 2Khz below R2600. 3 recording were made, one for each FMT run. Recording auto started 5 minutes prior and 5 minutes post FMT schedule.
In "real time", calibrated HF2 RF Front End 5 minutes prior to FMT Start Time. HF2 Tune to R2600 measures Ref freq at sub 1hz resolution. During FMT Key Down, measured FMT freq and noted for reference. All radio setting; LO, Tune, Output Bandwidth, filter, etc.
Post analysis is done by playback of FMT band recordings using the HF2 receiver for playback. There are many different set-up and procedural options to choose in combination with a DDC receiver and SpecLab that will result in the same result, measurement of the FMT frequency. For POST analysis, I found this to be simple.
The playback HF2 audio output is streamed via a virtual audio cable to SpecLab for audio analysis. Three steps are performed during the playback, set-up of HF2 audio, set-up of SpecLab, and generating FFT export file. First, the HF2 is Tuned such that the audio output contains the R2600 audio_ref signal and audio_FMT signal. RF and Audio filters are applied to reduce nearby interfering RF & audio signals. Second, SpecLab is set-up to view the same HF2 audio output and the FFT export defined to capture the audio_ref & audio_FMT. Third, SpecLab FFT export is manually started and stopped for FMT Key Down.
The Export FFT data is then processed to determine the audio_Ref and audio_FMT. Techniques for used to qualify statistically relevant data points. Using the same techniques to eliminate any varriations in the receiver processing, a calibration factor is defined as the delta of R2600 Gen Ref and measured Ref. The difference of audio_ref and audio_fmt is then added to the correction factor which is added to the R2600 Gen Ref, results being a post FMT measurement. Soapbox: Enjoyed the FMT. Used a newly acquired DDC SDRStick HF2 receiver. An FMT forces one to learn how their DDC receiver really works, its all about the math. Very well executed FMT, spot on with the schedule, bands conditions were favorable to receive all FMT runs in Arizona. During each run there were some noted interference signals, but nothing that caused a real problem or concern. All FMT signals were received at least 5 db above noise, 20M was 10 db. 40M was 22 db above noise. and 80M was 6 db. STDev.p of raw data was 0.7 , 0.9 , and 1.1 respectively. | ||||||||
| AA8K | MI | W8 |
| Method: I used Open HPSDR (Mercury), Flex-Radio's PowerSDR, Trimble Thunderbolt GPSDO, and Spectrum Lab. I offset the HPSDR frequency about 500 Hz to make a tone with the HPSDR BFO, used PowerSDR to make a wave file. I played the file back in WMP and ran Spectrum Lab, noting the offset from the HPSDR frequency. I used a TAPR TADD-2 connected to the GPSDO and receiver as a marker generator to check for DDS tuning word and sound card errors. Antenna: ground-mounted vertical 10 meters high. Soapbox: EN82sx Wide frequency variation on 20 meter, another station near and above W100AW/5 on 40 meter, on 80 meter one of a digital station's tones was a couple of Hertz away from W100AW/5. Signal levels in dBm, all measured on the same vertical antenna: 20 meter -60 Noise Floor -105, 40 meter -50 Noise Floor -100, 80 meter -50 Noise Floor -90. WWV 2.5 MHz -80, 5 MHz -60, 10 MHz -50, 15 MHz -55, 20 MHz -95. CHU 3.3 MHz -60, 7.8 MHz -60, 14.6 MHz -100. | ||||||||
| AB4RS | VA | W4 |
| Method: Tuned and measured using a HP3586b locked to a Trimble Thunderbolt. Sampled the 15625 Hz IF and analyzed directly using SpectrumLab and a dart board. Soapbox: Good signals into VA on all bands. There were a couple of interesting hops in frequency during the call-up on 40m. Propagation on 80m gave me a couple distinct frequencies with energy shown. I hope I guess the right one | ||||||||
| AC0ZG | CO | W0 |
| Method: HPSDR Hermes with WWWV calibration Soapbox: Thanks! | ||||||||
| AE7XC | ID | W7 |
| Method: Used Digital Master as the frequency indicator. Radio calibration checked against WWV at 5, 10 and 15 Mhz to determine vfo error trend. Soapbox: Radio used was an old TS-680 in cw mode. Love those Kenwoods. | ||||||||
| AE8I | OH | W8 |
| Method: FLEX 1500 Soapbox: My first ARRL FMT - Hopefully I'm within 1 MHz. | ||||||||
| AF6SN | CA | W6 |
| Method: IC-703 Receiver beating with SDR-kits QRP2000 Si570 XO, calibrated to WWV. Dipole antennae for 20M, 40M; screwdriver vertical for 80M. Soapbox: 20M nice sig (599) on west coast. 40M sig weak (559) with RTTY QRM. 80M sig good (579) with heavy QSB. My first FMT. This was fun! Let's do it again!! | ||||||||
| AF9A | IN | W9 |
| Method: HPSDR Mercury, phase display, with external 10MHz OCXO calibrated to WWV & CHU. Soapbox: 20M signal was only about 10dB above the noise on peaks. 40M & 80M were great, 40+ dB above the noise. Thanks! | ||||||||
| AG6SV | CA | W6 |
| Method: 1) Used iCom receiver connected to an 80m dipole to locate tone to +/-10 Hz
2) Then used the following equipment chain: Large loop antenna, LNA (50 dB gain), Mixer (down converter), LPF (110 kHz), DC Amp. (40 dB gain), LPF (3.1 kHz), to DSO.
3) LO into mixer was from Synthesized Function Generator (DDS) with ext. ref. locked to a 10 MHz Station Standard.
4) Method: Set LO (DDS) to that recorded from the iCom in step 1. Next tuned LO (DDS) till approx. DC displayed on DSO. Then recorded DDS setting as frequency received. Soapbox: 20m was pretty quiet, but there was some QRM/RFI on 40m band & a lot more QRM/QRN/RFI on 80m. Thanks for the entertainment & hope to hear how well I did on my 1st HF-FMT. | ||||||||
| AI6RE | CA | W6 |
| Method: Flex6500 connect to GPS Clock - Spectran measuring beat offset to dial setting Soapbox: Could not copy 40m signal | ||||||||
| K0ANS | CO | W0 |
| Method: FT-817ND w/TCXO, Apple iMac running CocoaModem 2.0. Turned on the radio 2 hours before. Measured WWV before and after to find a correction factor. Soapbox: I didn't hear the 40m signal at all. 80m was so loud I switched to a 6m antenna. | ||||||||
| K0BJB | NE | W0 |
| Method: TS440S on am, fed HP8640B capacitively into 440 rx,measured audio beat note from 440 with counter, measured 8640B with counter. I usually set the 8640B below the freq I am measuring, but tonight it worked better on the high side, so I subtracted the audio counter number from the counter number of the one monitoring the 8640B. The bad thing is it requires a good signal. I thought I was going to get 14121. I heard them tuning up before broadcast time but I never could find them after that. The teletype screwed up 7055 and by the time I found the signal around 7058, it was to late to setup. | ||||||||
| K0MZ | KS | W0 |
| Method: Tuned signals with an Atlas 210X receiver. A Drake TR-7 transfer oscillator was counted with a Heathkit IM4100 counter and clocked with an HP 10544A time base. The TR-7 was tuned to the 210X signal by ear using whatever CW note sounded best for matching the pitch. Thank you, Connie, for performing this really fun FMT this evening. Soapbox: The 20 meter signal was quite weak here in Kansas measuring about S3 to S5 with no noticeable doppler. The 40 meter signal was much stronger, about S8 to S40 over. Quite a bit of QSB and with moderate doppler varied the signal a lot, but it was easily measured. The 80 meter signal was very strong with QSB at S20 over to pegging the meter. Here again there was moderate doppler swimming the signal. | ||||||||
| K0PF | CO | W0 |
| Method: Heterodyne mixing of signal generator and on-the-air signal. Match amplitudes and look for zero beat. OCXO reference for sig gen. Soapbox: 20 meters very weak here, 40 meters had lots of QSB, making heterodyne mixing difficult, 80 meters had RTTY on top of the FMT signal, but the signal was strong. Thanks for the fun, good luck to all. | ||||||||
| K1GGI | MA | W1 |
| Method: Heterodyne with HFO referenced to gps, analyze beat with SpectrumLab. Soapbox: Good copy on all, 20m was the most stable. Sad to hear QRM. | ||||||||
| K3KO | NC | W4 |
| Method: HP8657B (Rb locked) ref osc, HP5335A counter with HPIB file generation
K3 + computer 1, sound card 1,Spectrum Lab with data reduction in DPLOT
TS480 +computer2, sound card 2, Spectrum Lab and DPLOT
20 Beam, 40 dipole, 80 dipole Soapbox: Thanks for the FMT. All signals over S9. Glad I had a dual channel setup. On 40M, the results from one channel were all messed up. | ||||||||
| K4BSD | AL | W4 |
| Method: Same old school method, analog sig gen, Icom7000 RX, HP5328A counter.
Beat sig gen against received signal, count with HP. Soapbox: 20M Clear S1 40M Light QRM S9+20 80M Heavy QRM S9+20 | ||||||||
| K4BYN | NC | W4 |
| Method: Yaesu FTdx5000 using WSPR 2.11 Soapbox: First time, fun, not a clue as to what I was doing. Will do again though! | ||||||||
| K4CXX/4 | NC | W4 |
| Method: A good antenna in a quiet location with a SW RX with BFO, and a synthesizer capable of 0.1 Hz resolution with variable attenuation. Soapbox: All signals were 599 with no QRM on 20 and 40, and a minimal amount on 80. Propagation was superb, as WWVH in Hawaii could be easily copied as well as WWV in CO on both 10 and 15 MHz for post test measurement corrections. All measurements were by auditory means. | ||||||||
| K5CM | OK | W5 |
| Method: Method: For transmitting the FMT I use an HP-Z3801 GPS frequency source which clocks a HP-3336b and a PTS-250. This feeds a 10 db transistor amp which drives a 12by7 / pair of 6146. The final amp runs about 300 watts. There are no mixers or any device in the chain of amplifiers that might impact the accuracy of the GPS frequency source. I verify the accuracy of the TX system with a second GPS referenced Receive system. Antennas:80 meter dipole slopping down from a 140' tower. 40 meter dipole between two 80' towers, 4 element SteppIR in bi-direction mode for 20 meters. For RX I use an FT-1000D in AM mode with a PTS-250 for low side injection. Audio is feed to SpectrumLab. RX antennas are 500' Beverage Soapbox: Great fun to use the W100AW call to transmit the FMT. Just by chance W1AW/X was using frequencies near 7055, so had to scramble to find a "more clear" frequency a little higher. 80 meters also had RTTY QRM, but in general conditions were good for this FMT. | ||||||||
| K5RKS | OK | W5 |
| Method: Frequency standard is HP3336B using external 10Mhz GPS disciplined clock as a reference. I inject signal from HP3336B into antenna so that I hear tones from both the injected signal and the off-the-air FMT signal on my receiver. Then I use homebrew software, using FFT algorithm, to determine the frequency of the audio tones from receiver. Soapbox: 20m: The last ten seconds of the FMT signal was garbled due to QRM so I tossed out the last couple of 64K sample groups. [The way I run the FMT is that I make a separate FMT calculation for every group of 64K sound card samples -- which is approximately 8 seconds of measurements. Then I average all of the good 8.192 second runs together to get final reported result] 20m signal had QSB and noise and signal ranged from S3 to S5 and I noticed about +/- 0.3Hz of apparent "drift" back and forth on the signal -- evidently due to Doppler. 40m -- I noticed that the 40m callup was "not there" so I looked around and found the signal up a couple of KHz. 40m signals were S9+20dB and solid and stable. 80m -- signal was strong and stable with a strength of S9+20DB. Connie: Thanks for running this FB FMT. | ||||||||
| K5XL | TX | W5 |
| Method: Flex-1500 with GPSDO and Spectrum Lab. Soapbox: 20m signal weak and fading and Doppler was a wild ride. 40m and 80m signals were good with moderate Doppler shifting. Thanks ARRL and Connie! | ||||||||
| K6APW | CA | W6 |
| Method: Elecraft K2 transceiver and DDS signal generator beat to zero. Soapbox: Good signals. Measurements not as easy as with my previous equipment. | ||||||||
| K6BZZ | AZ | W7 |
| Method: GPSDO, HP-3336B, Flex 1500, Spectrum Lab, Win 7 , 20 meter antenna is a TransWorld 20-10, 40 meter attic dipole for 40 and 80. Soapbox: 20 mtr sig S9+,40 mtr S8,80 mtr S7. Not much doppler tonight. Moderate qsb on 40 and 80. 20 very strong and stable. Thanks Connie. We appreciate your dedication and hard work for this test. | ||||||||
| K6DSW | CA | W6 |
| Method: Frequency spot by Elecraft K3 transceiver. | ||||||||
| K6IQL | KS | W0 |
| Method: Audio Beat Method with RF Reference Synthesizer set about 500 Hz below unknown signal. Synthesizer clocked by Rb frequency standard. Rb calibrated to, but not locked to, Thunderbolt GPS by phase comparison at 10 MHz. Audio analyzed in real time by SL on one computer and also recorded as wav file on another computer along with 500.0000 Hz calibration tone to enable the sample rate error to be removed. Soapbox: Great fun as always. 20M signal very strong into KS. No measurement due to operator error. 40M - QRM did not acquire the signal at all. 80M very strong signal. Measurement ran smoothly. 80 M data should be good. Thanks Connie for another fine FMT. -73 john k6iql | ||||||||
| K6OQK | CA | W6 |
| Method: I sample the I.F. of my GPS referenced HP-3586B and feed the resultant 15625 Hz I.F. into the Y side of a scope. I feed a GPS referenced HP-3336A tuned to match the HP's 15625 Hz I.F. into the other side to obtain a 1:1 Lissajou pattern on the scope. I also feed a sample of the I.F to my laptop computer running Spectrum Lab. See:http://www.k5cm.com/k6OQK%20FMT%20NEW.htm Soapbox: The signals on all bands were pretty good in Glendale, CA, not too much Doppler for a change. Thanks to Pam N5KW for lending Connie(K5CM) to us this evening, and thanks to Connie himself for providing the signals to measure. _Burt, K6OQK | ||||||||
| K6YAZ | CA | W6 |
| Method: Kenwood TS-950SD, HP 8644A signal generator locked to GPS. Soapbox: 20 Meter signal, 40 and 80 very weak. QRM on 40, data. | ||||||||
| K7HIL | AZ | W7 |
| Method: IC7800 ref to GPSDO. Mode was CW with a 2 min CW pitch run after each band FMT. Main Rx to a 5BTV vertical and Sub Rx to Yagi (20/40) and Dipole (80). Spectrum labs used on both real time and playback data for analysis. Very little difference between vertical and other antennas Soapbox: Doppler prevailed. On 20M continual upward drift of about 250 mHz. 40M pretty stable and 80 was a disaster with about 1 Hz jumps. Prior to FMT listened to 40M and the QRM was horrid. Because of the narrow bandwidth capability of CW mode (50 Hz) selected I heard no QRM during the actual test. | ||||||||
| K8CT | MI | W8 |
| Method: GPS disciplined Flex-1500, monitor audio with Spectrum Lab, plot and analyze in Excel, apply estimated doppler correction. Soapbox: All signals were S9 or better here in Michigan. Thanks to all who make the tests and practices possible. | ||||||||
| K8DJR | MI | W8 |
| Method: Icom 756 Pro III and I-Phone Frequency generator App to beat against note. | ||||||||
| K9QHO | IN | W9 |
| Method: TenTec Omni 7 Soapbox: First Time | ||||||||
| K9QJS | WA | W7 |
| Method: Elecraft K3 with P3 panadapter, dipole at 35 feet. Soapbox: First time giving FMT a try and looking forward to learning more. | ||||||||
| KC0FNS | CO | W0 |
| Method: BAre bones setup: TenTec Jupiter + short g5rv. I zero beat on signals in CW mode. Calculated percent error from dial measurements using wwv etc, averaged the %error. Python program takes measured/dial frequency, outputs calculated actual freq. Soapbox: This was fun, made me think about what a frequency was on the dial. I realized in real life there are nearby stations and other signals to content with. This was fun to share with another ham buddy. | ||||||||
| KC8IMB | OH | W8 |
| Method: Yaesu FT-950 using FLDigi measured against WWV (on closest frequency). Soapbox: FB RX on all bands. Thanks! | ||||||||
| KD2BD | NJ | W2 |
| Method: All homebrew equipment including a quadrature phasing direct conversion receiver, WWVB referenced frequency standard, frequency counter, and end-fed wire antenna. Method involved phase locking the receiver's LO to the frequency of the unknown carrier minus a 1 kHz offset. The carrier's frequency was determined by measuring the frequency of the receiver's LO over a 10 second integration period while factoring in the 1 kHz offset, and taking an average of all the readings taken. Full details are available at: http://www.qsl.net/kd2bd/fmt-methodology.html Soapbox: I built a new higher frequency LO for my FMT receiver a few weeks ago to allow measurements to be taken on 40 meters. I saw only 0.05 Hz peak-to-peak deviation in my 80 meter measurements, and 0.275 Hz peak-to-peak deviation on 40. The Kp index was 1. Connie's signals were STRONG! TNX everyone! | ||||||||
| KD5MMM | TX | W5 |
| Method: Yaesu ft847, Spectrum Lab, chu as reference Soapbox: poor reception on 20m, 40 & 80 better. 73 all | ||||||||
| KD7F | WA | W7 |
| Method: Receiver:IC-751 in cw mode with 250Hz IF filter; HP8648B locked to a homebrew GPSDO to provide a marker signal of known frequency. Spectrum Lab software for tuning, wave file recording and initial frequency estimates. MathCad analysis of the saved wave files for final frequency determination. Soapbox: Good signals on all bands however the 80M signal had heavy RTTY QRM. This was my first FMT and I enjoyed it. Thanks to those who provided the test signals! This is an update to my original estimated values following additional analysis of stored wave file data. | ||||||||
| KD7TUN | WA | W7 |
| Method: IC-746pro, WWV, fldigi Soapbox: 1. What is a soapbox? 2. Why is the date above April 10 when the FMT is April 9? | ||||||||
| KE4PT | FL | W4 |
| Method: Icom 756 pro-III, Signalink-USB sound card, computer running Digipan.
Warm up equipment for more than 1 hour, set radio dial to about 1.5 kHz below test frequency in upper SSB mode, observe carrier frequency in Digipan waterfall. Measure WWV at 10 and 15 MHz before, during and after FTM transmission to obtain a radio frequency error in parts per million. During FMT, measure test transmissions using the Digipan waterfall. Finally apply the correction in ppm to the test transmissions. Estimated resolution is 0.1 Hz, estimated uncertainty is 1 Hz. Error sources include propagation Doppler shift, SNR, and waterfall resolution. I also measured the WWV 500 Hz and 600 Hz tones to make sure that the sound card / Digipan display was in calibration. Soapbox: I wanted to measure the test frequencies using nothing more than the ham station equipment: a modern transceiver, an external sound card, and digital communication software. Objective was a frequency measurement with an uncertainty of less than 1 Hz. | ||||||||
| KF4BQ | FL | W4 |
| Method: HPSDR Hermes with V2.7 FW(freq roundoff fixed). Also 2nd Hermes with .5Hz offset custom FW. PowerSDR used with panadapter/scope/phase displays. Thunderbolt GPS for 10MHz ext ref. Used both Hermes w/PSDR only to resolve freq. Have other test eq (locked freq gens) but used only radios for this test. CL33 up 25' for 20M. Long wire for 40/80M. Soapbox: First try at FMT. Didn't have hope for 20M but Rx'ed weak signal. Some strong QRM FMT guy Txing during test..what for, can't afford a coupler?? 40M surprised me a bit being so far up in freq. 80M came in best for my guesses !! Didn't realize that I would have to block much of the test becuz of QRM. Hope to better next time..experience helps !! Would be nice to have test with results due in 15min from end.. that would be fun!! | ||||||||
| KF4MH | AL | W4 |
| Method: Icom 7700 and Multi-Psk software Soapbox: Noticed abit of freq jitter on the 20m freq in the last 1 min. | ||||||||
| KF5KEL | LA | W5 |
| Method: FLDIGI and WWV Soapbox: 40m not heard at my QTH | ||||||||
| KG0HY | NE | W0 |
| Method: Receiver is a WinRadio G313. Antennas used were HF vertical and a dipole. Calibrated to CHU. FMT signals on 20M were fair, did not hear 40M, 80M was strong. | ||||||||
| KG6HSQ | CA | W6 |
| Method: HP 3586C, Spectrum Lab Soapbox: 20m was very stable, Fades and doppler on 40 & 80 | ||||||||
| KI0LS | MN | W0 |
| |||||||||
| KI4FW | VA | W4 |
| Method: IC703, cocoaModem Soapbox: This is my first FMT -- I have no method at all, as yet (I'm guessing), but the exercise interests me, so I'll try to figure a way to do this using the basic software that I possess. Thanks for doing this, Connie. /s/ Rich, KI4FW | ||||||||
| KK4BJV | AL | W4 |
| Method: Kenwood ic-7700 to Multi-Psk software Soapbox: 40m had some rtty close by, glad I was able to find you. | ||||||||
| KK5J | OK | W5 |
| Method: Equipment was HP select level meters disciplined with rubidium clocks. Calibrated to WWV. Soapbox: Thanks to K5CM, Connie for all the work. It was fun again. 20 meters was a bit difficult. Nice key down time allowed good measurement on all bands. QRM was bit much on 40 with someone trying hard to be a "Ringer". Hope I didn't measure his freq! | ||||||||
| KK6JTL | CA | W6 |
| Method: 40/20-foot, 18-gauge wire doublet to 25 feet of 300-ohm twinlead; RTL-SDR USB DVB-T (R820T) tuner (73ppm correction); Ham-It-Up up-converter, SDR-Sharp software on Windows 7 (64-bit) | ||||||||
| KM6QX | CA | W6 |
| Method: Flex-1500 in CWU 600Hz mode, clocked by GPSDO. Tone, via virtual audio cable into Spectrum Lab. Soapbox: FMT started at sunset here on West Coast, so Doppler was changing throughout the test. Strong S7 to S9 signals, nice job Connie. I saw several weaker stations suddenly try to contact your Call-Up. :) | ||||||||
| KN4ZQ | VA | W4 |
| Method: ICOM 7600, XP PRO, FLDIGI Soapbox: My first time trying | ||||||||
| KU4PY | AL | W4 |
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| KV6O | CO | W0 |
| Method: TS-2000, HP 8924C with OCXO as time base, K1JT's FMT tools from WSPR. Soapbox: Was going to use K3 as in previous attempts, but it seems to have course synthesizer steps which leads to increased error with this method. TS-2000 seemed better. Had some difficulty with the 40M signal, it was higher than expected and I wasn't prepared for that! Made a last minute change and used the results from a 20second sample... we'll see! 20M had a lot of fast QSB, 40 and 80 seemed better. | ||||||||
| N0XC | WI | W9 |
| Method: Elecraft K3 listening to unknown signal and a signal, 10 Hz higher, generated by a GPSDO disciplined HP3336B. Audio analyzed by Laptop running Baudline under Linux. Soapbox: My son Ben, KC9ROI and I had a bunch of fun. 40M had the most amount of doppler we have seen recently. Thanks Connie for the FMT! | ||||||||
| N2GL | OR | W7 |
| Method: GPS referenced Selective Level Meter IF output measured with Spectrum Lab plus windage for gray line Doppler experienced in earlier practice sessions. Soapbox: Good Signals in Oregon but heavy rtty qrm on 80M. Thanks to those responsible for running the FMT. | ||||||||
| N2GX | NJ | W2 |
| Method: HP8656B locked to a Lucent RFTG GPS-disciplined rubidium standard; ICOM IC-703 receiver; difference viewed with Spectrum Lab FFT software. Soapbox: Too much QRM on 40... but that's the challenge! | ||||||||
| N2QLQ | FL | W4 |
| Method: FT1000-MP
"Stealth" Attic Antenna
WSPR software
Homebrew Computer running XP with Soundblaster 9000 PCI card Soapbox: 20 meters had the best signal, but for some reason the software showed a poor S/N ratio, so the result may be off. 40 meters had a weaker signal but better data, and I could barely hear the 80 meter transmission, so no joy there. All in all, another fun FMT. | ||||||||
| N3CRM | PA | W3 |
| Method: FT-950 and FLdigi Soapbox: 80 meter carrier shifted up a few Hz several times. Good test guys, thanks for the effort. | ||||||||
| N3FG | PA | W3 |
| Method: K3, Spectran, dipole Soapbox: Good copy. Some QRN on 80M but not bad. I liked the format. Many thanks for the event. | ||||||||
| N4AU | AL | W4 |
| Method: Used FLDigi in Analysis mode with docked scope. Used CHU for calibration (my TS570 has 20MHz time base and sometimes interferes with WWV signals). Put readings into spread sheet for calculations. Soapbox: Good signal on 20M and excellent on 80M but didn't locate the 40M signal. I looked up 1Kc and down 600 Cycles. Must have been further from 7055. | ||||||||
| N5DM | TX | W5 |
| Method: Kenwood TS-480s with DigiPan v2.0 Yagi and Dipoles. Soapbox: 20m signal seemed to have a second beat frequency very near the fundamental. Significant QSB on 80m signal in STX. Thanks to ARRL and K5CM. | ||||||||
| N5LUL | TX | W5 |
| Method: Yaesu FT-920/ trial and error method Soapbox: Had fun playing in the sandbox tonight. Hopefully my "fudge-factor" on 20M is good enough to keep me in the game. From what the rig shows as compared to broadcast freq is usually a bit high, so subtract a bit from there. | ||||||||
| N7AIG | AZ | W7 |
| Method: IC-7600 AM detector, external DDS freq synth carrier gen locked to GPS disciplined Rb for heterodyne reference, Flex-1500, Spectrum Lab, FLDigi. Measure beat audio frequency between FMT signal and my local RF carrier in AM detector mode. Tune local carrier below FMT sig, then answer = carrier + audio frequency. Recordings made of audio in FLDigi and Spectrum Lab, also I+Q recordings from Flex-1500. Soapbox: 20m test was a relative breeze. 40m was surrounded by huge pile of big-gun RTTY stations. 80m took pure guts against huge buzzing QRN from various dirty power systems in the neighborhood. All in all, a good time was had! | ||||||||
| N7EP | WA | W7 |
| Method: IC-746, Spec Lab, WWV Soapbox: QRM on 80M awful, just returned from AZ, equipment not warmed up. UGH | ||||||||
| N8OQ | VA | W4 |
| Method: Elecraft K3 USB + G3RUH GPSDO + K3EXREF in active mode. Spectrum Lab frequency centered and read with cursor in real time, no post processing done. Frequency = K3 display frequency + Spec. Lab frequency. Soapbox: Good signal levels on all bands, Doppler jitter minimal, except near end of 80m key-down period. | ||||||||
| N8PXW | OH | W8 |
| Method: HP Z8301 Frequency Standard, HP 5335A Frequency Counter, HP 8656A RF Signal Generator, Icom 706MKIIG Receiver. I set the receiver to the TX freq, mode CW, and used the frequency counter to measure the audio tone. After the test, I set the ref locked RF generator to the exact freq displayed on the receiver and measured the audio tone. I then used this as a the correction factor to determine the exact freq received. I averaged 14 readings for the 40M test, and 30 readings for the 80M test. I couldn't copy the 20M signal at my QTH. | ||||||||
| N9MVO | IL | W9 |
| Method: Kenwood TS 570S to laptop computer running ARGO QRSS viewer V1 build 134. I measured the audio tone frequency of WWV carrier at 10, 5 and 2.5 MHz, then interpolated that difference for the 40 and 80 meter signal frequencies. Then tuned in the signal frequency, and measured the audio frequency of that. The difference of that frequency from the expected WWV frequency is added to the dial frequency. Soapbox: I missed the 20 meter signal transmission, as I had another task, but got in early enough to make the measurements on 40 and 80. The digital synthesis of the TS 570 made this possible. How would one make this measurement with an olde TS 830 with analog mechanical VFO??? Maybe that's a project for the next FMT... | ||||||||
| N9YKE | WI | W9 |
| Method: A K3 main and sub receiver connected to different antennas used to detect signal in CW mode.
Two thunderbolt referenced DDS signals injected into both receive path about 50 Hz below and above the K3 dial frequency.
Audio frequencies measured with Spectrum Lab running on two computers. Four results are combined based on measurement StdDev to give result. Soapbox: Twenty meter test was about S4 with fading. I did not find the 40 M signal. The 80 m signal was S9 with fading. Thanks for the test, I have a lot of fun preparing and measuring. | ||||||||
| SV8QG | DX | DX |
| Method: Flex 1500 locked to GPS, Spectan for data acquisition. CHU was 14,670,000.21 Soapbox: Clear ID and clear tone on 20 m. I can’t say the same for 40m, I guess that the measured signal was from W100AW. | ||||||||
| VE2IQ | ON | VE |
| Method: Rx: TS850 (500-Hz CW filter), Ant: Low Dipole, Tune by ear to zero-beat 800Hz, record to hard disk, analyze later with FFT software. I use callup + keydown + handoff parts, averaging about 300 spot frequencies. Submit as measured (no Doppler compensation). Soapbox: I do this differently each time - still haven't got the Doppler correction figured out. Tnx to Connie and ARRL for enjoyable test. | ||||||||
| VE2XL | QC | VE |
| Method: Transceiver,signal generator,counter,headphones for zero beat. | ||||||||
| VE3GTC | ON | VE |
| Method: FT-950 radio, Marconi 2019 frequency synthesizer locked to external 10MHz reference of HP 5335 counter having 10811 ovenized reference. Output of generator was mixed with antenna feed using Mini-circuits combiner and level adjusted using HP 355 attenuators. Frequency was determined using the program Baudline on Linux, measuring the on air signal and reference signal to determine difference and then adding or subrtracting from refernce signal to determine frequency of on air signal. Soapbox: Much QSB tonight as well QRM on all frequencies especially on 40m. I had to scramble a bit to find the signal then had limited time to take a measurement. In all this evening was a good exercise in frequency measurement. cheers, Graham ve3gtc | ||||||||
| VE3OAT | ON | VE |
| Method: Trimble Thunderbolt GPSDO to discipline an HP 3325B sig generator. Receiver in AM mode. SpectrumLab software to measure audio freq difference between unknown signal and HP sig generator. Hardware works fine; brain in gear only sometimes. Soapbox: All signals S9+10 dB or better. Propagation fairly stable with none of the messy and broad Doppler smearing that I observed last week. Many thanks to ARRL and K5CM for running this test. | ||||||||
| W0HBK | IA | W0 |
| Method: Yaesu FT-920 with TCXO. Direct frequency measurement. Soapbox: Thanks for another great FMT Connie. Excellent signals (599+) on all three bands here in Cedar Rapids, IA | ||||||||
| W0WCA | CO | W0 |
| Method: TT Jupiter calibrated to WWV. Zero beat signal to "spot" Soapbox: Probably pretty naïve but wanted to take a shot . . . | ||||||||
| W1DOC | GA | W4 |
| Method: Flex 6700 Soapbox: Trying out Flex Radio's 6700 with GPSDO. | ||||||||
| W2EMN | NY | W2 |
| Method: R-390a receiver and H/P 8660 synthesized generator | ||||||||
| W2FD | PA | W3 |
| Method: ICOM 706 (1 Hz. Resolution) Measure output audio for CW (LSB and USB) and correct digital frequency dial reading offset from the difference of approximately 600 Hz. Use WWV 20 MHz. for calibration. Soapbox: Very strong signals on all bands. Thanks again, Connie ! | ||||||||
| W2IY | NY | W2 |
| Method: IC706MKIIG | ||||||||
| W2KKJ | NY | W2 |
| Method: TS-2000 + GPSDO w/ divider down to 10kHz + Joe Taylor's WSPR FMT software. Soapbox: 40 meters was a pileup at this QTH. Listened up to 2 kHz higher but did not hear W100AW/5. | ||||||||
| W3DAD | MD | W3 |
| Method: Used the W4AVO method. Calibrate Spectrum Lab using WWV tones; Determine Radio error using WWV & CHU carriers and plot result. Make measurement using LSB while recording Spec Lab output for averaging. Calculate FMT frequency = Dial F - (Beat F +/- correction). Using K3 Radio with TCXO, Antenna Vertical GP. Soapbox: My first attempt at a FMT. Good signals on all three bands, but lots of QRM around 7055KHz here, and glad the FMT transmitter chose to move up the band. Quite a challenge with ordinary equipment. Hope I came close. Thanks for the opportunity. I'll try this again. | ||||||||
| W3JW | VA | W4 |
| Method: IC-7800 locked to Rubidium standard into Spectrum Lab Soapbox: Strong signals on all three frequencies. Negligible QRN but the Irascibility of the Ionosphere is definitely still there! Thanks to Connie and all. | ||||||||
| W4ENN | AL | W4 |
| Method: Kenwood TS2000X Spectrum Lab sound card software. Soapbox: Thanks for FMT transmitting station. Hope I got the TCXO correction factors right. | ||||||||
| W4GO | VA | W4 |
| Method: TS-480HX with TCXO, Griffin iMic, fmt software by K1JT calibrated to WWV and CHU. | ||||||||
| W4JLE | SC | W4 |
| Method: Icom 756 Pro and FLDIGI Soapbox: On 80 some clown was attempting to zerobeat your signal and managed to get within 7 Hz, that coupled with an RTTY signal made it fun. Good signal into SC on all frequencies. Thanks for the FMT! | ||||||||
| W4PH | NC | W4 |
| Method: I calibrated my radio to wwv Then checked the strongest signal on my win radio excalibor. | ||||||||
| W4UK | SC | W4 |
| Method: GPSDO stabilized Flex 5000 with Fldigi Soapbox: Good signals this time. Thanks to all for the test | ||||||||
| W4WJ | TX | W5 |
| Method: K3 calibrated against WWV @ 10MHz... w/1000Hz offset tone fed into
laptop running Spectrum Lab. Spectrum Lab calibration checked against 1000Hz tone from NAB Audio Test CD. Hal SPT-1, Spectra-Tune set to 1000Hz for quick tuning. Soapbox: While my Racal 6790GM is out for repair, I need to devise a quick and simple method of obtaining an accurate zero beat with the K3. Then I will refine my sub-Hz technique. FMT is always fun. TNX to Connie, K5CM for hosting W100AW/5 | ||||||||
| W4YXU | AL | W4 |
| Method: Trimble Thunderbolt GPS, Flex-6500, spectrumlab, Quatro-pro Soapbox: 20m hertz may be just a guess - I forgot to write down the integer hertz value from the flex (first FMT attempt - ever!). A cw QSO popped up on the 40m freq just before the test and they seemed to be working just a few hz either side so I didn't hear any of the 40m. I am hoping my 20m entry is a good one. Just wait until next time!!! | ||||||||
| W5LAC | MS | W5 |
| Method: Flexradio 3000, LSB mode. Placed Roland VT-12 vocal tuner near speaker
adjusted receive frequency until I was generating a 440 Hertz tone (A above middle C). Subtract 440 Hz from dial frequency. Soapbox: This method seemed to work when I was practicing with WWV prior to the test. I could be way off, but it was fun ! | ||||||||
| W6BM | CA | W6 |
| Method: Thunderbolt => 3 synthesizers => SP600-JX17, dual trace scope, 455 kHz synth on one trace, IF from SP600 on the other, other two local conversion oscillators. Soapbox: Total QRM wipeout on 40, solid on 20, 80 in Berkeley. Doppler on WWV15 about -0.5 Hz just before test. | ||||||||
| W6OQI | CA | W6 |
| Method: The measurement process begins with a HP Z3801 GPS disciplined 10 MHz oscillator. The 10 MHz signal is used as a reference for an HP 3336B synthesizer level generator and an HP 3586 selective level meter. The 15625 Hz I.F. signal from the HP 3586 is compared to the HP 3336 generator. A scope is used to compare the HP 3336 tuned to 15625 Hz. When the pattern on the scope stand still the HP 3586 is tuned to the unknown frequency. The display on the front of the HP 3586 will show the transmitted unknown frequency. Of course the display is subject to Doppler shift. Thus there is still some guessing involved. Soapbox: The W100AW/5 signals on all three bands were S9 or above. Doppler shift was not too bad this evening. | ||||||||
| W7BDB | OR | W7 |
| Method: FT-857 with SWAG Soapbox: Just saw the notice on ARRL and tuned in, no equipment to do monitoring justice. Maybe by next testing opportunity. | ||||||||
| W7CQ | OR | W7 |
| Method: 40 meter Dipole, Icom 756, a Shera GPS Locked Frequency Standard into a HP8656B Signal Generator, Spectrum Lab, and I wrote a Excel spread sheet to take care of all the number crunching. (Time well spent) Lots of numbers to calculate. Soapbox: This is my first ARRL FMT try. Thanks to Bob W7PUA for all his coaching and good ideas to get this long desired project off the ground and to John K6IQL for all his practice sessions this last week. They really helped refine what I needed to do. Signals were good on 20 and 80 but the signal on 40 was smeared real bad and hard to find the center of. Calculated WWV offsets against my GPS locked Frequency standard on 15,10,and 5 mhz to help in the calculations. The fastest 45 minutes in ham radio. Boy was I busy. Jimmy W7CQ | ||||||||
| W7JWM | AZ | W7 |
| Method: HP Selective Level Meter with GPS frequency standard. Soapbox: No FMT signal heard on 40 meters. Frequency was occupied with both RTTY and CW signals. | ||||||||
| W7KPZ | OR | W7 |
| Method: IC-718 with indoor wire antenna. Frequency measured with FLDIGI in Freq Analysis mode. Linear error correction function calculated before, during, and after the test using WWV. Soapbox: Extremely strong signal on 20 meters. Heard almost nothing on 40, just the faintest trace on the waterfall display which I guessed at. OK signal on 80 meters with some QRM. Good fun a usual. Hope I didn't make any stupid arithmetic errors this time! | ||||||||
| W7MOT | AZ | W7 |
| Method: Radio: (SDR) SDRStick HF2 DDC Receiver
Computer: ASUS AC-N56RJ
Software: (SDR) HDSDR
Software: (Audio) SpecLab
Network: Netgear 1GB Switch, 1GB ASUS AC-RT66R Router
Antenna: Scorpion mounted at 8ft with elevated ground plane.
10MHz standard Trimble GPS DO stablizing R2600 oscillator.
Variable Signal Gen Motorola R-2600, E-12 with External GPS DO
Method:
This is a "real time" direct measurement of the FMT frequency using a DDC SDRStick HF2 receiver.
Setup R2600 Gen less than 2khz below expected FMT freq. Using HF2, set LO about 4 Khz below R2600.
In "real time", calibrated HF2 RF Front End 5 minutes prior to FMT Start Time. Real time measurements were done using two methods with mode set to ECSS and then CW. Both methods gave the same result, even though the techniques are different. Setting HF2 Tune to R2600 frequency, measure Ref freq to 1hz resolution, limitation is HDSDR displays only 1hz resolution. During FMT Key Down, set HF2 mode to ECSS, set LO close to FMT frequency, allowed Tune to seek and lock on signal. Directly recorded FMT frequency. Then measured FMT in CW mode and measured frequency on Tune. Soapbox: This submission is under the W7MOT club call to allow entry using direct "real time" of a DDC SDRStick HF2. The intent is to demonstrate & compare in the heat of competition two different methods. See the AA7OO results to compare. The direct method is less than 2hz difference which is about the same as the correction factor calculated in AA7OO. At this time, logic indicates that the direct method should be closer than the calculated method which includes a correction factor. The direct measurement done after calibration should be more accurate. We shall see and evaluate both methods after FMT actual's are posted. | ||||||||
| W7PUA | OR | W7 |
| Method: Icom IC-706 MKIIG with N6GN 30 MHz GPS reference into Spectrum Lab. Set the radio in USB to put tone at about 600 Hz to measure with Spectrum Lab. Soapbox: Always fun and good mind exercise! Thanks to all for putting on the test. | ||||||||
| W8DPK | OH | W8 |
| Method: My ears! Just read the dial of my 756-Pro3 in CW mode, tuning until the received tone exactly matched the sidetone frequency. Soapbox: Decent signals in central Ohio, although heavy QRM on 40M just before the test had me a little worried. Luckily the frequency cleared during the actual test. This was fun. Thanks! | ||||||||
| W9HLY | IN | W9 |
| Method: FLEX-1500, Digipan, Spectrum Lab. Soapbox: Good signals. Tks to all. | ||||||||
| W9TJ | IL | W9 |
| Method: Icom IC-R75, HB slave to R75, Diarcy 10mc GPS Standard, Techtronix 465 scope, HB digital signal generator, Spectrum Lab. Soapbox: Too close to source so 20 mtr sigs very weak and fading. Both 40 and 80 were S-9+20 or more. Many TNX to Connie for his efforts in our behalf. | ||||||||
| W9ZB | IN | W9 |
| Method: SDR receiver cal'd with WWV & CHU. Used phase to get fractional Hz Soapbox: 20M sig almost buried in the S-6 local noise; 40 & 80 band sigs were S-9+ | ||||||||
| WA1ABI | RI | W1 |
| Method: WJ-8718 Receiver locked to Rb standard, beat note measured with DL4YHF's Spectrum Lab software. Soapbox: Very good signals into RI on all bands. Thanks to K5CM and ARRL for another well-run FMT. | ||||||||
| WA2DVU | NJ | W2 |
| Method: Icom 7600 for spotting, Hp 3598, 3336, Tek 465, gps, dart board. Soapbox: I think I am at the point where Doppler is the main error in our measurements. On ground wave AM broadcast transmitters that are gps locked I can measure within a few parts in 10-12. I wonder what the secrets that others out of ground wave are doing to get consistent good measurements. Better dart board? | ||||||||
| WA4FJC | VA | W4 |
| Method: 20 M beam, 40 M dipole, HP 3586B, Spec lab for tuning. Signal levels 20 M -64 dB, 40 M -85 Db, 80 M -80 dB. Soapbox: Thanks to K5CM for his effort in putting on the test. Thanks to ARRL for sponsoring the test. 73 Gordon | ||||||||
| WA6RZW | CO | W0 |
| Method: I use a Kenwood TS-570 radio, Stanford Research SR-620 frequency and a Rigol DG-1022 signal generator. All the hardware is interfaced and controlled by a Linux computer. The software is homebrew. The user interface is via webpage. The entire process can be operated via the web from any location, served by the internet. The signal measurement and sampling time is about 15 seconds, and the entire process takes less than one minute. Results are calculated in realtime, generally results can be reported before the end of the test transmission. I used a secondary frequency display, a Chinese E-Bay counter running in its internal reference. The Chinese counter provides a frequency display of within 1Hz accuracy, is adequate for this exercise. Soapbox: I was not able to find the 40M FMT, just CW station calling CQ. For this FMT I elected to use the internal reference of the SR-620 counter. Before the start of the exercise I calibrated the reference to a homebrew rubidium 10MHz oscillator. The signal generator is synced to the counter, the TS-570 requires no calibration. | ||||||||
| WA6VPJ | CA | W6 |
| Method: ICOM 746Pro and WSPR software Soapbox: Mostly good signals this time. | ||||||||
| WA6ZTY | CA | W6 |
| Method: Used synthesizer with 1Hz steps as BFO to generate ~1000Hz beat in AM mode receiver. Viewed audio on scope triggered with 1000Hz oscillator. Fine tuned that oscillator to match beatnode then did the math. Soapbox: 20M signal was FB, no QRM. 40M had RTTY stations above/below and straddling FMT signal but managed to find it in the rubble. 80M QRM wasn't bad, locked into FMT signal quickly. First time I've felt confident on all measurements. Hope I did the math right! | ||||||||
| WA7KMR | WA | W7 |
| Method: RX HP3586B, Calibration source HP3336B, both units locked to Thunderbolt GPS disciplined 10Mhz source. Computer software was Spectrum Lab. I used the HP3336B to calibrate the sound card to 1850Hz. With a calibrate signal of 10Mhz to the HP3586B the tone out was 1849.621Hz. This calibration was used for the frequency measurements. Soapbox: I did not hear a signal on 40 meters, 20 meters was reasonably strong but 80 meters was very noisy with RTTY interference. This is my second attempt at FMT, clearly I need more practice and an improvement in methods. There is always next time. | ||||||||
| WA9VNJ | WI | W9 |
| Method: Yaesu FT-857D with XREF-FT board driven from Trimble Thunderbolt. Spectrum Lab to collect WAV file data and a separate FFT method to find peaks. Soapbox: This is my first attempt at FMT since one around the late 1960s. The 80m and 20m signals were well into the noise here, some of which is from inside my house with its simple garage attic dipole antenna. I hope I added and subtracted when I was supposed to! Thanks for a fun adventure. | ||||||||
| WB0LXZ | KS | W0 |
| Method: HP3586B, HP3335A, Thunderbolt GPS-disciplined Clock, Spectrum Lab, 80m dipole, 20m dipole, miniwhip. QRM on 7055, but otherwise strong signals. I recorded 7 minutes of CHU 14.67, CHU 7.85, and WWV 5 in the 21 minutes before the FMT, and concluded that I should subtract .05 Hz from 20 and 40 meter measurements, due to doppler effect. -WB0LXZ Soapbox: Great fun, thanks to K5CM and ARRL. Not many ham calls include a double zero. - WB0LXZ | ||||||||
| WB0OEW | AZ | W7 |
| Method: KX3, temp stabilization procedure, zero beat. Soapbox: First time for me, amazed how quickly each test period flew by. Thanks much, see you again. | ||||||||
| WB6BNQ | CA | W6 |
| |||||||||
| WB8EVI | OH | W8 |
| Method: Yaesu FT-1000MP tuning slowly in CW mode with spot switch on. Then compared to HP 5334A counter. Soapbox: Wish I had the high stability oscillator in my rig. This is fun! | ||||||||
| WK0I | TX | W5 |
| Method: QS1R SDR clocked by Thunderbolt via XT-Ref frequency synthesizer. QS1R provides a DDC synchronized DAC out which was piped into an Asus Xonar sound card driving Spectrum Lab. The receiver chain was calibrated with referenced HP8657A generator. DDC step error was corrected with spreadsheet written by K5XL. Soapbox: 15 Mhz WWV exibited up to -600 mHz doppler before signal. 14 Mhz was received at -90dB Lot of QSB. 7 Mhz ....couldn't have picked a worse freq. CW with big FM could not have been better centered at 500Hz passband. Thought we have to stay within 10 Hz so I didn't look up.. I will know better next time. Hi Hi 3.598 Mhz Nice signal at -40dB. -20 mHz doppler at 5Mhz WWV. Not considered or corrected for. Thank you for doing this. Lots of fun. 73, de WK0I ...-.- | ||||||||
| WR5J | WA | W7 |
| Method: zero beat 600 Hz CW sidetone - count beats and divide into the time Soapbox: First FMT - very high noise here - 40M inaudible - although I'm not even sure if I should be subtracting my 600 Hz CW sidetone from the reported freq. (I didn't...) We'll see. Gonna be really embarassing if I'm 600Hz off... Nowhere to go but up! Fun fun fun... Now go back and read the websites... Thanks for doing this! vy 73 de WR5J |