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July 2, 2009
Actual Audio Frequencies (Hz):
| 80m Tone 1 | 80m Tone 2 | 80m Dif | 40m Tone 1 | 40m Tone 2 | 40m Dif | |
| W1AW | 2,144.57 | 2,344.75 | 200.18 | 2,144.02 | 2,344.37 | 200.35 |
| WA6ZTY | 2,124.87 | 2,289.34 | 164.46 | 2,131.16 | 2,295.00 | 163.83 |
W1AW/WA6ZTY All (<=1 Hz):
W1PW
W1AW 80 Tone 1 (<=1 Hz):
AB2UW, AB4T, K1GGI, K3JA, K3JQ, KD2BD, PA3FWM, W1PW, W3JW, W4JLE, W6IHG, WA1ABI, WA3OZX
W1AW 80 Tone 1 (>1 to <=5 Hz):
AC8Y, KC2KY
W1AW 80 Tone 1 (>5 to <=10 Hz):
[none]
W1AW 80 Tone 1 (>10 Hz):
K3LLH, K4OL, VE4OV
W1AW 80 Tone 2 (<=1 Hz):
AB2UW, AB4T, AC8Y, K1GGI, KD2BD, PA3FWM, W1PW, W3JW, W6IHG, WA1ABI
W1AW 80 Tone 2 (>1 to <=5 Hz):
K3JA, K3JQ, KC2KY, W4JLE, WA3OZX, WB5EXI
W1AW 80 Tone 2 (>5 to <=10 Hz):
[none]
W1AW 80 Tone 2 (>10 Hz):
K3LLH, K4OL, VE4OV
W1AW 80 Dif (<=1 Hz):
AB2UW, AB4T, AC8Y, K1GGI, K3LLH, K4OL, KC2KY, KD2BD, PA3FWM, VE4OV, W1PW, W3JW, W6IHG, WA1ABI, WA3OZX
W1AW 80 Dif (>1 to <=5 Hz):
K3JA, K3JQ, W4JLE
W1AW 80 Dif (>5 to <=10 Hz):
[none]
W1AW 80 Dif (>10 Hz):
[none]
W1AW 40 Tone 1 (<=1 Hz):
AA7OO, AB2UW, AB4T, AC8Y, K1GGI, N6TTO, PA3FWM, W1PW, W3JW, W6IHG, W6OQI, W7ITM, W7MOT, W9TJ, WA1ABI, WA4TII, WA7ZZB
W1AW 40 Tone 1 (>1 to <=5 Hz):
K3JA, K3JQ, KC2KY, N5JOA, WA3OZX, WB5EXI
W1AW 40 Tone 1 (>5 to <=10 Hz):
AE5KP
W1AW 40 Tone 1 (>10 Hz):
K4OL, K6APW/7, N0RMZ
W1AW 40 Tone 2 (<=1 Hz):
AA7OO, AB2UW, AB4T, AC8Y, K1GGI, N6TTO, PA3FWM, W1PW, W3JW, W6IHG, W6OQI, W7ITM, W7MOT, W9TJ, WA1ABI, WA4TII, WA7ZZB, WB5EXI
W1AW 40 Tone 2 (>1 to <=5 Hz):
AE5KP, K3JA, K3JQ, KC2KY, N5JOA, WA3OZX
W1AW 40 Tone 2 (>5 to <=10 Hz):
K6APW/7
W1AW 40 Tone 2 (>10 Hz):
K4OL, N0RMZ
W1AW 40 Dif (<=1 Hz):
AA7OO, AB2UW, AB4T, AC8Y, AE5KP, K1GGI, K3JA, K3JQ, K4OL, KC2KY, N5JOA, N6TTO, PA3FWM, W1PW, W3JW, W6IHG, W6OQI, W7ITM, W7MOT, W9TJ, WA1ABI, WA3OZX, WA4TII, WA7ZZB
W1AW 40 Dif (>1 to <=5 Hz):
N0RMZ, WB5EXI
W1AW 40 Dif (>5 to <=10 Hz):
K6APW/7
W1AW 40 Dif (>10 Hz):
[none]
WA6ZTY 80 Tone 1 (<=1 Hz):
AA7OO, K6HGF, N6TTO, W1PW, W6BM, W6OQI, W7ITM, W7MOT, WA7ZZB
WA6ZTY 80 Tone 1 (>1 to <=5 Hz):
[none]
WA6ZTY 80 Tone 1 (>5 to <=10 Hz):
K6APW/7, K6BZZ, N0RMZ
WA6ZTY 80 Tone 1 (>10 Hz):
[none]
WA6ZTY 80 Tone 2 (<=1 Hz):
AA7OO, K6HGF, N6TTO, W1PW, W6BM, W6OQI, W7ITM, W7MOT, WA7ZZB
WA6ZTY 80 Tone 2 (>1 to <=5 Hz):
K6APW/7
WA6ZTY 80 Tone 2 (>5 to <=10 Hz):
K6BZZ, N0RMZ
WA6ZTY 80 Tone 2 (>10 Hz):
[none]
WA6ZTY 80 Dif (<=1 Hz):
AA7OO, K6BZZ, K6HGF, N0RMZ, N6TTO, W1PW, W6BM, W6OQI, W7ITM, W7MOT, WA7ZZB
WA6ZTY 80 Dif (>1 to <=5 Hz):
[none]
WA6ZTY 80 Dif (>5 to <=10 Hz):
K6APW/7
WA6ZTY 80 Dif (>10 Hz):
[none]
WA6ZTY 40 Tone 1 (<=1 Hz):
AA7OO, AB4T, K1GGI, K6APW/7, K6HGF, N6TTO, W1PW, W3JW, W6BM, W6IHG, W6OQI, W7ITM, W7MOT, WA1ABI, WA7ZZB
WA6ZTY 40 Tone 1 (>1 to <=5 Hz):
W9TJ
WA6ZTY 40 Tone 1 (>5 to <=10 Hz):
K6BZZ, VE4OV
WA6ZTY 40 Tone 1 (>10 Hz):
N0RMZ
WA6ZTY 40 Tone 2 (<=1 Hz):
AA7OO, AB4T, K1GGI, K6HGF, N6TTO, W1PW, W3JW, W6BM, W6IHG, W6OQI, W7ITM, W9TJ, WA1ABI, WA7ZZB
WA6ZTY 40 Tone 2 (>1 to <=5 Hz):
[none]
WA6ZTY 40 Tone 2 (>5 to <=10 Hz):
K6APW/7, K6BZZ, VE4OV
WA6ZTY 40 Tone 2 (>10 Hz):
N0RMZ, W7MOT
WA6ZTY 40 Dif (<=1 Hz):
AA7OO, AB4T, K1GGI, K6BZZ, K6HGF, N6TTO, VE4OV, W1PW, W3JW, W6BM, W6IHG, W6OQI, W7ITM, W7MOT, WA1ABI, WA7ZZB
WA6ZTY 40 Dif (>1 to <=5 Hz):
N0RMZ, W9TJ
WA6ZTY 40 Dif (>5 to <=10 Hz):
K6APW/7
WA6ZTY 40 Dif (>10 Hz):
[none]
Result Details (n=34):
| Call | QTH | Area | Method/Soapbox | |||||||||||||||||||||
| AA7OO | AZ | W7 |
| Method: equipment:
source: GPS receiver standard: Tremble Thunderbolt (GPS-DO)
standard: Spliter (1000hz and 10Mhz)
generator: Motorola R2600
radio: IC-703
computer: Dell latitude D820
sound card: Sigma Tel High Definition Audio CODEC
Spectrum Lab's software
Goldwave software
Method:
1. From GPS receiver into Tremble Thunderbolt GPS-DO then into spliter with 1000hz and 10Mhz standard output.
2. Use 10Mhz standard as the input reference for the R2600
3. To copy the CW on carrier, the radio was dialed 500hz high.
4. The R2600 was set to the specified carrier frequency minus 1500hz (LSB). This generates a 1000 hz signal on the LSB of the carrier. The generator output impedance is 50 ohms.
5. The R2600 gen output was then bridged into the antenna feedline.
6. This bridged feed was plugged into the IC-703.
7. The audio output of the IC-703 was then feed into the “line-in” of Dell Laptop. The sound card is a Sigma Tel Audio card with Sigma Tel High Definition Audio CODEC.
8. The digital output was used as the input to the Stectrum Lab 2.7b12 frequency analyzer for processing. Additionally the output was copied to a .WAV file for post processing.
Calibration:
1. The sound card was calibrated using a 1000 hz signal from the spliter. Calibration was required to find the sample rate error ratio.
Calulations:
1. Calibration of the audio card required anlaysis by SpecLab data to determine what the processed 1000hz signal vs actual 1000hz standard input. The ratio of standard/processed signal will then be applied to all processed frequency’s.
2. See 1K Calibration tab of spreadsheet for actual data analysis.
3. The other calibration is the test runs effective processed 1000 hz calibration signal. The processed 1K calibration is made up of the difference of the IC703 dial indicator and the actual carrier, plus the delta of processed 1000hz calibrated delta.
4. these two components are then applied to each of the two processed tone frequencies (f1 and f2). Line-In correction ratio = (processed 1K) / (1000hz GPS-DO spliter)
1K ref = | (R2600 – Carrier) | note: this is going through the radio then to Line-in
1K ref delta = ( processed 1K-ref * ratio ) - 1K-ref ) note: this calibrates the SL scale
Tone1 = ((processed audio Tone 1) * ratio )-(1K-ref delta)-(dial offset)
Tone2 = ((processed audio Tone 2) * ratio ) - (1K-ref delta) -(dial offset) Soapbox: This is the my first FMT. It was fun and educational. There was a lot of pre-work and then setup. This activity was done as a club event. Participants: each participant will individually analyze and submit results under their own call sign. The participants will average all of the individual analysis and submit as the club's submission. Norm Johnson, AA7OO Dusty Morris, W7ITM Majdi Abbas, N0RMZ A few observations follow. 1. The test runs were received starting with the CW message and the two tone test. 2. The Spectrum Lab displayed the near realtime processed visuals of frequency vs amplitude and waterfall. 3. While each of the three tones was observed and could be directly read from the display, this measurement was not considered accurate since there is a uncorrected error in the IC-703 dial and real carrier frequence tuned; and and uncorrected error in the audio card and frequency processed by the Spectrum Lab software. Look forward to doing this again. Norm Johnson, aa7oo | ||||||||||||||||||||
| AB2UW | NY | W2 |
| Method: Icom IC-7000, Signalink USB interface to laptop running Digipan. Three hour warmup, then tuned to WWV on 5001, 5002 & 5003, so WWV carrier acted like LSB tone. Did the same thing with CHU, tuning the radio to 7851, 7852 & 7853. Used AFC feature on Digipan to get readout of tone frequency on Digipan & then adjusted "REF adjust" in IC-7000 to get 1, 2 & 3 kHz tones as close as possible - noted discrepancies. W1AW tone length was enough to get AFC in Digipan to work - looked at phase scope in Digipan to see when AFC had "locked" on to W1AW tone. Averaged 3 or 4 tone readings & corrected for the slight discrepancies. Soapbox: The sound card in the Signalink is much better than the one in the laptop, less noise & seems very stable after warmup. The IC-7000 is good for this because it has an adjustment for its internal frequency reference. Laptop didn't get as much warmup as I would have liked. 40 m signal was much weaker at my QTH than the 80 m signal. | ||||||||||||||||||||
| AB4T | NC | W4 |
| Method: Elecraft K3, SignaLink USB soundcard, MixW software. Warmed up all equipment for several hours. Checked calibration of radio/soundcard against CHU at 3.33 mHz, and WWV at 5 and 10 mHz. Set K3 on published carrier frequencies in LSB mode. Used AFC and phase scope on MixW to help center tones. Read audio frequencies from MixW in real time. Averaged tones and added calibration correction factors. Soapbox: As expected, could not hear WA6ZTY at all on 80m. Thanks for conducting this test. | ||||||||||||||||||||
| AC8Y | VA | W4 |
| Method: WJ-8718A Receiver, HP-5334A Frequency Counter, referenced to an HP-58503A GPS frequency standard. | ||||||||||||||||||||
| AE5KP | OK | W5 |
| Method: Yaesu FT-857D and Spectrum Lab software. Soapbox: First time FMT participant. Never heard the 80m transmission from this QTH. Switched to 40m and caught the last 2 cycles of the 40m W1AW transmission. | ||||||||||||||||||||
| K1GGI | MA | W1 |
| Method: Heterodyne with known frequency from signal generator calibrated to gps, Measure audio tones with SpectrumLab. Soapbox: Good signals from W1AW. No copy of WA6ZTY on 80, around S4 on 40. | ||||||||||||||||||||
| K3JA | MD | W3 |
| Method: ICOM 756 Pro III and a frequency counter (which happened to be an old Tektronix CMC251, but this is not critical) connected across the speaker terminals.
Prior to the FMT, frequency of WWV at 5, 10, and 15 MHz was measured. With the mode set to USB, and the transceiver tuned to
4998 kHz, 9998 kHz, and 14998 kHz, the frequency counter read 2.006 kHz, 2.014 kHz, and 2.023 kHz, respectively, indicating that the measured frequency was 6 Hz high at 5 MHz, 14 Hz high at 10 MHz, and 23 MHz high at 15 MHz. Measurements were repeated in the LSB mode, confirming these offsets.
Interpolating these offsets to 7095 kHz gives an offset of 9 Hz high for the 40m test, and extrapolating to 3597.5 kHz, gives an offset of 4 Hz high for the 80m test.
At the time of the 80 m test, I set the PRO III to 3597.5, LSB, with 3.0 kHz bandpass filter and waited to record the frequencies measured by the frequency counter. It didn't quite go according to plan, and I switched to USB, tuned around to find the signal, set the dial to 3594.8 kHz, and recorded the frequencies measured by the counter.
Things went a little more smoothly for the 40m test, with a setting of 7095 kHz, LSB, 3.0 kHz filter.
The offsets determined from the WWV measurements were applied resulting in the values shown in the entry. (Hope I did all my additions and subtractions correctly!) Soapbox: This is my first try in the FMT, and I wanted see what could be done without specialized equipment or spectral analysis software. This method clearly requires a fairly good s/n ratio without a lot of QRN. I did have a good s/n ratio at my QTH, but there were sufficient "static crashes" to give the frequency counter a few conniptions. It would probably help to try to zero in on the transmitted frequency and switch to a narrow cw filter. | ||||||||||||||||||||
| K3JQ | MD | W3 |
| Method: ICOM 756 Pro III and a frequency counter (which happened to be an old Tektronix CMC251, but this is not critical) connected across the speaker terminals.
Prior to the FMT, frequency of WWV at 5, 10, and 15 MHz was measured. With the mode set to USB, and the transceiver tuned to
4998 kHz, 9998 kHz, and 14998 kHz, the frequency counter read 2.006 kHz, 2.014 kHz, and 2.023 kHz, respectively, indicating that the measured frequency was 6 Hz high at 5 MHz, 14 Hz high at 10 MHz, and 23 MHz high at 15 MHz. Measurements were repeated in the LSB mode, confirming these offsets.
Interpolating these offsets to 7095 kHz gives an offset of 9 Hz high for the 40m test, and extrapolating to 3597.5 kHz, gives an offset of 4 Hz high for the 80m test.
At the time of the 80 m test, I set the PRO III to 3597.5, LSB, with 3.0 kHz bandpass filter and waited to record the frequencies measured by the frequency counter. It didn't quite go according to plan, and I switched to USB, tuned around to find the signal, set the dial to 3594.8 kHz, and recorded the frequencies measured by the counter.
Things went a little more smoothly for the 40m test, with a setting of 7095 kHz, LSB, 3.0 kHz filter.
The offsets determined from the WWV measurements were applied resulting in the values shown in the entry. (Hope I did all my additions and subtractions correctly!) Soapbox: This is my first try in the FMT, and I wanted see what could be done without specialized equipment or spectral analysis software. This method clearly requires a fairly good s/n ratio without a lot of QRN. I did have a good s/n ratio at my QTH, but there were sufficient "static crashes" to give the frequency counter a few conniptions. It would probably help to try to zero in on the transmitted frequency and switch to a narrow cw filter. | ||||||||||||||||||||
| K3LLH | SC | W4 |
| Method: IC-7000, FLDIGI Soapbox: ... first time try; only measured the one pair | ||||||||||||||||||||
| K4OL | GA | W4 |
| Method: HP 5300 Freq Counter across the speaker terminals. Yaesu FT 920 set to LSB on the published frequency Soapbox: Prior to the FMT test I checked tjhe FT920 against WWV on both 5 & 10 MHz. I tuned plus and minus each freq to determine approx center freq. I figured the rig was less than 50 Hz off, however I did not try at attach any instrumentation to try and determine the actual frequency error. | ||||||||||||||||||||
| K6APW/7 | OR | W7 |
| Method: Ten Tec Argonaut V, digital audio generator, find beat and calculate absolute frequency, subtractions for shift. Soapbox: Could not resolve 80M carriers absolute. | ||||||||||||||||||||
| K6BZZ | AZ | W7 |
| Method: FT-817, Spectrum Lab, Vista computer. Soapbox: Missed W1AW run due to operator error. In usb instead of lsb. That doesn't work! Big lesson learned for next time. | ||||||||||||||||||||
| K6HGF | CA | W6 |
| Method: Audio output of GPS locked 3586B tuned to published frequencies displayed on Spectrum Lab. | ||||||||||||||||||||
| KC2KY | NY | W2 |
| Method: 1.) Elecraft K-3 with TCXO option
2.) Zero beat 10 MHz WWV signal to K3 800 Hz side tone using the K3's built-in reference calibration procedure
3.) PC running Digi-Pan, adjusting sample rate correction option to calibrate the AFC and frequency display to the WWV 800 Hz pitch produced by the K-3 in CW mode Soapbox: Band conditions were much better than they were in the November test. W1AW was 40 over S-9 at my QTH on 80 meters, 10 over on 40 meters. No copy from WA6ZTY. Experience from the November FMT made the July FMT go a lot smoother. For the next drill, publishing a screen shot of the blank data entry page in advance would be helpful in clarifying the rules. | ||||||||||||||||||||
| KD2BD | NJ | W2 |
| Method: A homebrew WWVB-disciplined frequency standard, ICOM IC-R2 receiver, Linux-based PC, soundcard, homebrew audio recording software, and Baudline spectrum analysis software were used in this FMT exercise.
W1AW's signals were received using the IC-R2 operating in AM mode. A 3600 kHz carrier generated by the frequency standard was mixed with W1AW's signals to serve as a BFO. Audio from the receiver was recorded by the soundcard's left audio channel, while the right channel recorded a 1000 Hz reference tone generated by the frequency standard.
The accuracy of the soundcard, recording software, and Baudline software combination was first determined by performing a precise frequency measurement of the 21st harmonic of the 1 kHz audio reference. Next, Baudline analysis of W1AW's audio was performed, with the final results adjusted according to the soundcard's sampling error determined in the previous step.
An Elecraft K2/100 was also on-hand to receive W1AW's signals. It was used to take ballpark readings during the FMT, and to serve as a "sanity check" for the final results. Soapbox: Good signals were received from W1AW on 80 despite nearby thunderstorms. This FMT represents my first involving soundcard frequency analysis techniques. | ||||||||||||||||||||
| N0RMZ | AZ | W7 |
| Method: This is my individual submission as part of a group effort amongst the members of the Motorola Amateur Radio Club of Arizona (W7MOT). Norm Johnson, AA7OO, and Dusty Morris, W7ITM also participated, and will be making individual submissions as well as one for the group.
Equipment:
Thunderbolt GPS receiver providing 10 MHz reference for a Motorola R-2600 service monitor used as a signal generator, tuned 1 kHz below the receiver, an Icom IC-703+, to provide a reference audio tone between the carrier and audio tones. Laptops equipped with Spectrum Lab for the audio tone measurement.
In retrospect, due to local noise sources, the receivers should have been powered off of battery. Something for next time :)
No copy of W1AW on 80 meters here, but 40M and the west coast transmissions were fine. Soapbox: W1AW was buried in the noise on 80M at this location. I will need to remember to run the receivers on battery for future FMTs to bring the noise level down. I was part of a group FMT effort sponsored by the Motorola Amateur Radio Club of Arizona (MARCA; W7MOT). Many thanks to Norm Johnson, AA7OO and Dusty Morris, W7ITM, who also participated. And thank you, ARRL and WA6ZTY, for another FMT! | ||||||||||||||||||||
| N5JOA | FL | W4 |
| Method: AOR AR 7030 Receiver, Dipole Antenna and Spectran Software on Windows 98 OS Computer. Direct tone measurement. Soapbox: LSB Signal 5-5 at 0152 UTC. | ||||||||||||||||||||
| N6TTO | CA | W6 |
| Method: Receiver: Flex 5000A fed with an external GPS disciplined 10 MHz reference oscillator (Trimble Thunderbolt).
Local reference signal generated at 1800 Hz in the passband using a second GPSDO, homebrew tripler feeding a DDS-60 (AD 9851).
Recorded and analyzed using Spectrum Lab with increased FFT size (262144 points). Averaged frequency over 3 measurements of each 10 second tone. Soapbox: Multipath and propagation effects showed up as dispersion of the received signals - even as close to WA6ZTY as I am! Some custom DSP software to analyze and average over all the samples would be very helpful to try and filter these effects out. Maybe next time I'll have learnt enough about DSP programming and resorted to hacking the software myself! | ||||||||||||||||||||
| PA3FWM | DX | DX |
| Method: Homebrew direct-sampling SDR hardware was used to record parts of the HF spectrum around both FMT frequencies and CHU at 3330 and 7850 kHz.
Afterwards, I measured the received frequencies in deeply zoomed waterfall diagrams made using homebrew SDR software. The CHU recordings served to calibrate my receiver (and perhaps also the ionosphere). Soapbox: Not having anticipated 5 minutes of CW at the beginning of W1AW's transmission, I had scheduled the recording too short, and thus lost most of the 40m tones. Therefore I used the tones sent on 40m during the 80m test for my 40m submission, hoping they match. WA6ZTY's signals were undetectible. The ionosphere does weird things to signals; CHU on 3330 and 7850 kHz seemed to differ by about 0.1 ppm, and W1AW on 80m was spread out over more than 1 Hz. | ||||||||||||||||||||
| VE4OV | MB | VE |
| Method: Icom IC765 Xcvr, 20 meter dipole, Spectrum Lab. I warmed-up the gear for 24 hrs., and zero-beat to WWV at 10 MHz. I also used CHU for a cross-check. I found that my rig read high by 86.5 Hz on LSB, so I subtracted this number from the Spectrum Lab. readings for tone 1 and 2. I recorded the whole session using Spectrum Lab., and post-processed the results using its expanded frequency capabilities. I also found that the suppressed LSB info on CHU is readable with the software, so this helped to calibrate my aging IC765. Soapbox: My first FMT. W1AW on 80m very readable here in MB, but I could not hear the 40m transmissions. WA6ZTY unreadable on 80m but good on 40m. This explains my submissions. I learned a lot about my Xcvr and the difficulties of doing this test. I prepared and rehearsed using the radio and the software, so that I could pull this off. The FMT is a great idea, and should be promoted and continued. Thanks to W1AW and WA6ZTY. Vy 73, Rick. | ||||||||||||||||||||
| W1PW | AZ | W7 |
| Method: FT-817ND in LSB mode. Calibration with Trimble Thunderbolt GPS-Disciplined 10 MHz reference. Signals measured using Spectrum Laboratory FFT software. Excel spreadsheet to calculate measurement corrections per GPS reference results Soapbox: Spectrum Lab was Amazing! I could not (acoustically) hear ANY trace of the W1AW signal on 80 mters, but when I ran the audio through Spectrum Lab, the signals were fairly easy to see and measure. | ||||||||||||||||||||
| W3JW | VA | W4 |
| Method: Antenna is a 260'long inverted Vee at 60';Receiver is Icom 7800 locked to external Trimble Thunderbolt 10 MHz GPSDO; measurement software is Spectrum Lab. Soapbox: Band conditions were about average for a summer night. The 80 M W1AW signal was very strong (at least 20 db over nine). Both 40 M signals were medium readable. The WA6ZTY 80 M signal did not make it to the east coast at that hour of the evening. For any chance of detection and measurement it would have had to be delayed about one and a half or two hours (either that or wait till next winter when mother nature will have rotated the solar daylight clock!). | ||||||||||||||||||||
| W4JLE | SC | W4 |
| Method: ICOM 746 Pro / FLDIGI frequency measurement mode. Soapbox: 10 seconds to measure, write, calculate is a bear! | ||||||||||||||||||||
| W6BM | CA | W6 |
| Method: Described in 2006 entry with pictures. HP 5061A => 5110 => 2 x 5100, SP600-JX17 with external synthesized LO, BFO, digital measurement of beat note. | ||||||||||||||||||||
| W6IHG | VA | W4 |
| Method: FT2000, HP3336 Reference Generator with GPS discipling, SpectrumLab, Delta Reference method Soapbox: No west coast 80m signal heard in VA | ||||||||||||||||||||
| W6OQI | CA | W6 |
| Method: HP3586B locked to HP Z3801 GPS receiver. The HP3586B was tuned to the announced frequency while in the LSB noise/demod mode. The resultant tones were fed to a computer running Digipan. The tone frequencies were read from the Digipan display. A Digipan/sound card correction factor was determined by measuring a GPS locked signal generator before and after the FMT. Soapbox: No signal was heard from W1AW on 80 meters. The W1AW 40 meter signal was about S5. WA6ZTY was strong on both 80 and 40 meters at my QTH near Los Angeles. | ||||||||||||||||||||
| W7ITM | AZ | W7 |
| Method: AA7OO,N0RMZ, and W7ITM as a MARCA (W7MOT) club effort used a IC-703, Motorola R-2600 locked to a Trimble Thunderbolt, and Spectrum Lab to record the FMT. Each operator then processed the recorded files. These are the results by W7ITM. We could not copy W1AW on 80m. | ||||||||||||||||||||
| W7MOT | AZ | W7 |
| Method: equipment:
source: GPS receiver standard: Tremble Thunderbolt (GPS-DO)
standard: Spliter (1000hz and 10Mhz)
generator: Motorola R2600
radio: IC-703
computer: Dell latitude D820
sound card: Sigma Tel High Definition Audio CODEC
Spectrum Lab's software
Goldwave software
Method:
1. From GPS receiver into Tremble Thunderbolt GPS-DO then into spliter with 1000hz and 10Mhz standard output.
2. Use 10Mhz standard as the input reference for the R2600
3. To copy the CW on carrier, the radio was dialed 500hz high.
4. The R2600 was set to the specified carrier frequency minus 1500hz (LSB). This generates a 1000 hz signal on the LSB of the carrier. The generator output impedance is 50 ohms.
5. The R2600 gen output was then bridged into the antenna feedline.
6. This bridged feed was plugged into the IC-703.
7. The audio output of the IC-703 was then feed into the “line-in” of Dell Laptop. The sound card is a Sigma Tel Audio card with Sigma Tel High Definition Audio CODEC.
8. The digital output was used as the input to the Stectrum Lab 2.7b12 frequency analyzer for processing. Additionally the output was copied to a .WAV file for post processing.
Calibration:
1. The sound card was calibrated using a 1000 hz signal from the spliter. Calibration was required to find the sample rate error ratio.
Calulations:
1. Calibration of the audio card required anlaysis by SpecLab data to determine what the processed 1000hz signal vs actual 1000hz standard input. The ratio of standard/processed signal will then be applied to all processed frequency’s.
2. See 1K Calibration tab of spreadsheet for actual data analysis.
3. The other calibration is the test runs effective processed 1000 hz calibration signal. The processed 1K calibration is made up of the difference of the IC703 dial indicator and the actual carrier, plus the delta of processed 1000hz calibrated delta.
4. these two components are then applied to each of the two processed tone frequencies (f1 and f2). Line-In correction ratio = (processed 1K) / (1000hz GPS-DO spliter)
1K ref = | (R2600 – Carrier) | note: this is going through the radio then to Line-in
1K ref delta = ( processed 1K-ref * ratio ) - 1K-ref ) note: this calibrates the SL scale
Tone1 = ((processed audio Tone 1) * ratio )-(1K-ref delta)-(dial offset)
Tone2 = ((processed audio Tone 2) * ratio ) - (1K-ref delta) -(dial offset) Soapbox: This is the clubs first FMT. It was fun and educational. There was a lot of pre-work and then setup. This activity was done as a club event. Participants: each participant will individually analyze and submit results under their own call sign. The participants will average all of the individual analysis and submit as the club's submission. Norm Johnson, AA7OO Dusty Morris, W7ITM Majdi Abbas, N0RMZ A few observations follow. 1. The test runs were received starting with the CW message and the two tone test. 2. The Spectrum Lab displayed the near realtime processed visuals of frequency vs amplitude and waterfall. 3. While each of the three tones was observed and could be directly read from the display, this measurement was not considered accurate since there is a uncorrected error in the IC-703 dial and real carrier frequence tuned; and and uncorrected error in the audio card and frequency processed by the Spectrum Lab software. Look forward to doing this again. Norm Johnson, aa7oo President, MARCA Inc. | ||||||||||||||||||||
| W9TJ | IL | W9 |
| Method: Direct measure of received frequency. Soapbox: Missed second tone of W1AW on 80. Signals good on W1AW. No signal heard on 80 from west coast. 40 from west coast was weak and QRN. No frequency measurement on either cw signal to establish doppler. | ||||||||||||||||||||
| WA1ABI | RI | W1 |
| Method: WJ-8718 Rcvr with Rb timebase. DL4YHF's Spectrum Lab software. Soapbox: Thanks ARRL and Mike WA6ZTY for the FMT. 73. | ||||||||||||||||||||
| WA3OZX | NJ | W2 |
| Method: Ten-Tec Argonaut V (516) tuned to announced carrier frequency and set to LSB mode on each band. Audio to HP Pavilion N5425 running Ubuntu Linux 8.04. Tone frequencies measured using fldigi 3.02 waterfall spectral display. Soapbox: I think the lower audio tone was sent first, i.e., Tone 1, on each band, but I am not sure. So, I may have the Tone 1 and Tone 2 frequencies reversed. Things were happening fast and I forgot to make a note of it. ;-) | ||||||||||||||||||||
| WA4TII | GA | W4 |
| Method: FT1000MP AND SOUND CARD | ||||||||||||||||||||
| WA7ZZB | WA | W7 |
| Method: IC-706MK2G w/TXCO & Fan Mod.
fldigi Soapbox: W1AW not heard on 80, quite weak on 40. TNX to WA6ZTY for providing west coast signal. | ||||||||||||||||||||
| WB5EXI | TX | W5 |
| Method: IC-706MKIIG; Dell GX-270 Computer; SignalLink SL-1 Interface; Hamscope software. Calibrated radio and software against WWV at 5 & 10 MHz for both absolute frequency offset and the 500 & 600 Hz WWV tones; preset radio for 80 and 40 mtr with corrected frequencies based on WWV calibration; used Hamscope to read tone frequency; Except used USB to calibrate instead of CW, which was what I needed to do the measurement, so had to make last minute adjustments: Afterward, I rechecked WWV and found that WWV was at 701 HZ instead of 1000 Hz we used for calibration, so added 299 to Hamscope readings. Soapbox: I was able to hear W1AW, but did not hear WA6ZTY. I need to be more carful when doing setup calibration for the FMT. Hopefully I will remember next time to set radio to CW for WWV calibration and for preset of FMT frequencies. I had fun and enjoyed the challenge; please keep doing the FMT. I do like the twice a year timing. |