Results - April 24, 2024 FMT
| Actual Radio Frequencies (Hz): | ||
| 80m | 40m | |
| K5CM | 3,598,852.74 | 7,064,143.45 |
| W8RKO | 3,599,373.10 | 7,065,452.80 |
K5CM,W8RKO All (<=1.0 Hz):
AA3I, AA6LK, AF9A, AJ4YA, AJ5P, GW4BVE, K0MZ, K0WM, K1MU, K5CM, K5RKS, K6LL, K8GB, K8YUM, KA5QEP, KA8BRK, KB3HF, KB4XR, KC3VNB, KD2BD, KD5FX, KD5HIP, KD5MMM, KD7KDO, KD8RV, KE6ZLX, KN1H, N0PFE, N1HAC, N5TNL, N7WS, N8OBJ, N9BPL, NA2SW, VE2IQ, VE3GSO, W0HBK, W2FD, W2TX, W3JW, W4IVF, W5LAC, W5SSV, W6BM, W6OQI, W7SUA, W8TM, W8WTS, W9GR, W9INE, W9MDB, WA1SXK, WA5UCW, WA7BNM, WA7X, WB2CMF, WQ8T
K5CM 80 (<=1.0 Hz):
AA3I, AA6LK, AF9A, AG6AQ, AJ4YA, AJ5P, GW4BVE, K0MZ, K0WM, K1MU, K5CM, K5RKS, K6LL, K8GB, K8YUM, KA5QEP, KA8BRK, KB3HF, KB4XR, KC3VNB, KD2BD, KD5FX, KD5HIP, KD5MMM, KD7KDO, KD8RV, KE6ZLX, KK4KAZ, KM6QX, KN1H, N0PFE, N1HAC, N5TNL, N7WS, N8OBJ, N9BPL, NA2SW, VE2IQ, VE3GSO, W0HBK, W2FD, W2TX, W3FAY, W3JW, W4IVF, W5LAC, W5SSV, W6BM, W6OQI, W7SUA, W8GNM, W8TM, W8WTS, W9GR, W9INE, W9MDB, WA1SXK, WA5UCW, WA7BNM, WA7X, WB2CMF, WB7ABP, WB8REI, WQ8T
K5CM 80 (>1 to <=5 Hz):
AA7OO, W0DAS, WA2DVU
K5CM 80 (>5 to <=10 Hz):
(none)
K5CM 40 (<=1.0 Hz):
AA3I, AA6LK, AF9A, AJ4YA, AJ5P, GW4BVE, K0MZ, K0WM, K1MU, K5CM, K5RKS, K6LL, K8GB, K8YUM, KA5QEP, KA8BRK, KB3HF, KB4XR, KC3VNB, KD2BD, KD5FX, KD5HIP, KD5MMM, KD7KDO, KD8RV, KE6ZLX, KK4KAZ, KN1H, N0PFE, N1HAC, N5TNL, N7WS, N8OBJ, N9BPL, NA2SW, SP5LST, VE2IQ, VE3CXB, VE3GSO, W0DAS, W0HBK, W2FD, W2TX, W3JW, W4IVF, W5LAC, W5SSV, W6BM, W6OQI, W7SUA, W8GNM, W8TM, W8WTS, W9GR, W9INE, W9MDB, WA1SXK, WA5UCW, WA7BNM, WA7X, WB2CMF, WQ8T
K5CM 40 (>1 to <=5 Hz):
AA7OO, AG6AQ, WB8REI
K5CM 40 (>5 to <=10 Hz):
(none)
W8RKO 80 (<=1.0 Hz):
AA3I, AA6LK, AF9A, AG6AQ, AJ4YA, AJ5P, GW4BVE, K0MZ, K0WM, K1MU, K5CM, K5RKS, K6LL, K8GB, K8YUM, KA5QEP, KA8BRK, KB3HF, KB4XR, KC3VNB, KD2BD, KD5FX, KD5HIP, KD5MMM, KD7KDO, KD8RV, KE6ZLX, KK4KAZ, KM6QX, KN1H, N0PFE, N1HAC, N5TNL, N7WS, N8OBJ, N9BPL, NA2SW, VE2IQ, VE3GSO, W0DAS, W0HBK, W2FD, W2TX, W3FAY, W3JW, W4IVF, W5LAC, W5SSV, W6BM, W6OQI, W7SUA, W8GNM, W8TM, W8WTS, W9GR, W9INE, W9MDB, WA1SXK, WA2DVU, WA5UCW, WA7BNM, WA7X, WB2CMF, WB7ABP, WB8REI, WQ8T
W8RKO 80 (>1 to <=5 Hz):
SP5LST
W8RKO 80 (>5 to <=10 Hz):
(none)
W8RKO 40 (<=1.0 Hz):
AA3I, AA6LK, AF9A, AG6AQ, AJ4YA, AJ5P, GW4BVE, K0MZ, K0WM, K1MU, K5CM, K5RKS, K6LL, K8GB, K8YUM, KA5QEP, KA8BRK, KB3HF, KB4XR, KC3VNB, KD2BD, KD5FX, KD5HIP, KD5MMM, KD7KDO, KD8RV, KE6ZLX, KM6QX, KN1H, N0PFE, N1HAC, N5TNL, N7WS, N8OBJ, N9BPL, NA2SW, SP5LST, VE2IQ, VE3CXB, VE3GSO, W0DAS, W0HBK, W2FD, W2TX, W3JW, W4IVF, W5LAC, W5SSV, W6BM, W6OQI, W7SUA, W8TM, W8WTS, W9GR, W9INE, W9MDB, WA1SXK, WA2DVU, WA5UCW, WA7BNM, WA7X, WB2CMF, WB7ABP, WB8REI, WQ8T
W8RKO 40 (>1 to <=5 Hz):
W8GNM
W8RKO 40 (>5 to <=10 Hz):
KK4KAZ
| Entries (n=71): | ||||||||||||||
| Call Sign | QTH | Area | Grid | Method/Soapbox | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| AA3I | PA | W3 | FN20if |
|
Method: TS590S Transceiver, short vertical dipole, and laptop running WSJT-X with Trimble GPS receiver for calibration. WSJT data copied to an Excel spreadsheet for averaging and calibration correction. Soapbox: Received strong 40 meter sigs but 80 meter sigs weaker with QSB. Lots of late night data entry errors but think I got all the corrections. Always fun ! Thanks to K5CM and W8RKO ! | |||||||||
| AA6LK | CA | W6 | CM98kw |
|
Method: HP Z3805A 10MHz GPSDO, Marconi 2019 HF synth, HP 3325A LF synth, HP 54601A o'scope, FT-847 in AM/narrow mode, 5BTV antenna, Win10 laptop running SpecLab, Digipan for spotting, EZGPIB driving USBserial and Prologix USB-GPIB to control and interrogate the instruments and radio, GPSCon for monitoring Z3805A; the 2019 was set to inject a reference beat signal to produce a ~400Hz beat tone, and the 3325A was manually tuned for minimum phase slip between it and the beat tone as seen on o'scope. Each run was also recorded to a .wav file through SpecLab, though this time I just used the display as a sanity check. Soapbox: Thanks Connie and Mike for running the event. 40m signals were strong but wildly unstable. 80m signals were weak but less unstable. 73, L- | |||||||||
| AA7OO | AZ | W7 | DM43eh |
|
Method: (none) Soapbox: Lots of noise on both 40M and even more on 80M. The Scorpion Antenna setup was done cluggy since I'm in a "No Amateur Radio Antennas" HOA with Tile, foil roof insulation, and chicken wire Faraday Gage walls. Expecting violation letter shortly. Some of the noise is a noisy ground from multiple power substations and some radiation from power substation. Just have to accept and work with noise at this time. It was all identifiable in the Radio Displays, SpecLab Displays, and the M2600 Service Monitor. | |||||||||
| AF9A | IN | W9 | EM69wv |
|
Method: (none) Soapbox: Thanks guys for another great FMT. Good signals all around 10 - 30 dB over S9. | |||||||||
| AG6AQ | CA | W6 | CM97bf |
|
Method: RTL-SDR,OCXC-10MHz,Audacity(plot spectrum) Soapbox: First time participant. It's fun. | |||||||||
| AJ4YA | NC | W4 | FM05st |
|
Method: Used a K3s and dipole antenna for both 40M tests.For 80M I used a End Fed Long Wire cut for 80M. I zero-beat each signal, then adjusted my guess to arrive at my entry. Soapbox: Both stations had strong signals. It was fun. Thank you. | |||||||||
| AJ5P | MS | W5 | EM51kr |
|
Method: IC-705, FL-Digi Soapbox: Fair to good signals both stations. Lots of QSB and doppler. | |||||||||
| GW4BVE | DX | DX | IO82kq |
|
Method: SDRplay RSPdx GPS locked using an RFzero board. SpectrumLab on PC. Doppler correction using CHU data. Soapbox: Good signals from both stations. Thank you for another challenge. | |||||||||
| K0MZ | CA | W6 | DM03ts |
|
Method: TR-7 receiver, local oscillator into Heathkit IM-4100 clocked with HP 10544A OCXO. Tuned zero beat local oscillator by ear. Calibrated HP 10544A to WWV earlier in the day. Soapbox: Signal levels; K5CM 40 M, S-10 over 80 M, S-10 to S-20 over. W8RKO 40 M, S-7 to S-9, doppler +/- .4 Hz, 80 M, right at noise level. Thank you Connie and Mike. These FMT exercises are always fun to prepare for and participate in. | |||||||||
| K0WM | CO | W0 | DM79jt |
|
Method: Setup: Yaesu FT-1000MP Mark V, Rockwell/Collins 180S-1 tuner, 40-meter dipole, Fluke 8845A audio frequency meter. Calibrate the receiver with a Bodnar GPSDO. Have used my homebrew Excel spreadsheet to analyze several FMTs, with varying degrees of success. :-) Soapbox: The 40- and 80-meter signals were excellent. Very low frequency variation on K5CM’s 40-meter signal. Thanks to Connie and Mike for continuing support of this interesting event. | |||||||||
| K1MU | VA | W4 | FM18ju |
|
Method: IC-7610 with BG7TBL clock; Bodnar mini GPS clock for reference. Soapbox: W8RKO signals were good, but K5CM had much more doppler. Less confidence in those results. Hope I do better this time, but fun nevertheless. | |||||||||
| K5CM | OK | W5 | EM25ir |
|
Method: TX: HP Z3801 GPS frequency standard, HP-3336b. A 10 db transistor amp follows and drives a 12by7 / pair 6146. Then to the final amplifier (8877) running 800 watts out. There are no mixers or any device in the chain of amplifiers that might impact the accuracy of the GPS frequency source. RX: K3 in AM mode with low side injection from a GPS locked HP-3336B. Audio is feed to Spectrum lab. Soapbox: Mike was strong on both bands. | |||||||||
| K5RKS | OK | W5 | EM15gj |
|
Method: Injected RF signal into receiver using HP3336B at the same time as listening to off the air FMT signal. Measured audio tones coming out of receiver. Used homebrew FFT program to determine frequency of audio tones. This corresponds to difference in frequency of the injected RF signal and the FMT signal received off the air. Soapbox: Signal from K5CM on 80m was very weak. Other signals were S4 to S6. | |||||||||
| K6LL | AZ | W7 | DM22qq |
|
Method: Uncalibrated K3 receiver in AM mode. Bodnar GPSDO used as BFO. Spectrum Lab software and spreadsheet were used to analyze the resulting audio tone. No attempt at Doppler correction. My measured freq = GPSDO + averaged tone. Soapbox: Signals were loud and clear. Digital QRM on 80 quit in the nick of time. Standard Deviations of the tones on all four runs were low, and only two wild (>3 sigma) data points (out of about 240) were suppressed. | |||||||||
| K8GB | MI | W8 | EN82ln |
|
Method: RSPdx -- HFSDR 2.81 Beta 6 ECSS Mode Using Phase Scope Auto Calibration - Error correcction earlier using WWV 25 MHz Soapbox: (none) | |||||||||
| K8YUM | TX | W5 | EM00kb |
|
Method: (none) Soapbox: Signals were generally stronger than I am accustomed to seeing on these affairs, but the signals were "torn up" more due to propagation, the worst I can remember. | |||||||||
| KA1CXD | VT | W1 | FN32jw |
|
Method: Calibration with Chinese made gpsdo, using a rtlsdr with Sdrangel software, audio fed into PLL made with Gnuradio for audio frequency determination and logging. Soapbox: First try at this. Have to hone my data logging as I'm unsure of my final math results. 40 meters was very good was able to tune on the call up the average for almost the whole key down period. 80 was harder weaker signals more QRN and QRM, took all of the call up and was only able to average less than 1/2 the key down period. Hope to do this again!!! Thanks for putting this on!!! | |||||||||
| KA5QEP | OK | W5 | EM15ni |
|
Method: Receiver ICOM R9500. Audio was recorded and analyzed with Mathematica. Soapbox: All signals were received well. Doppler was minor. I'm trying a new method to correct Doppler effects. I'll be interested to see the correct frequencies. | |||||||||
| KA8BRK | OH | W8 | EN81fc |
|
Method: IC-706, IC-7100, 80 Meter Inverted Vee, Bodnar Mini and Homebrew GPSDO, Fldigi, LibreOffice, No Doppler Correction Attempted Soapbox: Good signals with some QSB and, I suspect, significant Doppler shift. Thanks to K5CM, W8RKO, and anyone else that helps with this | |||||||||
| KB3HF | MO | W0 | EM48qt |
|
Method: TS-890, WSPR software Soapbox: Great signals on all 4 sessions TNX. | |||||||||
| KB4XR | VA | W4 | FM18hw |
|
Method: ICOM 725 fitted with TCXO, FLDIGI FMT, Bodnar GPSDO for ref, spectral analysis of audio recording using Scilab tools. Checked WWV 5MHz &CHU 3.33 MHz for confidence. Attic G5RV. Soapbox: Really fun: challenging and totally absorbing! Thank you K5CM & W8RKO. Love reading how others do it. This is my 2nd FMT and hoping to be an order of magnitude better than my 3 Hz first-time performance by having my own reference. Still learning. Noise was S8 on 80 meters in VA but the carrier was coming through. I was getting some small discrepancies between spectral analysis and FLDIGI. Went with the spectral analysis. Didn’t try and take into account Doppler. Old rig (1990). Got to build a decent reference antenna with adjustable attenuation. | |||||||||
| KC3VNB | PA | W3 | FN00dl |
|
Method: ICOM-7300, 80m EFHW, Leo Bodnar mini-gpsdo. Used FLDIGI/FLRIG in FMT mode, using the Bodnar as a reference freq, approximately 1 kHz away from detected frequency. Measured 5MHz WWV after test to get a sense of Doppler shift for K5CM location - added 0.2/0.3 Hz to the measured results. Soapbox: FLDIGI recording was buggy after running for long time - got corrupted files with only a few usable measurements during test. Restarting it after the test appeared to get it back on track. Start FLDIGI fresh before test next time. Thanks to K5CM and W8RKO for running this. 73 | |||||||||
| KD2BD | NJ | W2 | FN20xd |
|
Method: All homebrew equipment including a carrier phase tracking receiver, a WWVB referenced frequency standard, electrically small vertically polarized loop antenna, and a frequency counter. Method involved phase locking the receiver's DDS LO to the frequency of the unknown carrier minus a 1 kHz offset, measuring the frequency of the receiver's LO over several 10 second integration periods and taking an average of the readings after factoring in the 1 kHz offset. Details available at: https://www.qsl.net/kd2bd/fmt-methodology.html Soapbox: K5CM had strong signals but W8RKO was noticeably stronger. The solar flux was 219 and the Kp-index was 2. All signals suffered from some QSB and short-term phase/frequency instability. The greatest frequency deviation was observed on K5CM on 80 (the longest path with the most hops), while W8RKO had the least on 40 (a shorter path with fewer hops). | |||||||||
| KD5FX | OK | W5 | EM16lr |
|
Method: FLEX6300 (no GPS) with fldigi FMT mode using 1 min average. Radio was calibrated to local Bodnar MiniGPS device. Soapbox: K5CM was 20 to 30 over S9 on both bands! W8RKO 10 to 20 over S9 on both bands! I really like the move to Tuesday night at 0300Z. | |||||||||
| KD5HIP | AR | W5 | EM36bd |
|
Method: (none) Soapbox: (none) | |||||||||
| KD5MMM | TX | W5 | EL19ds |
|
Method: FT-847, SpecLab, Spreadsheet, CHU for reference Soapbox: Loud sigs ,+20 or better, on all runs. Freq didn't seem very stable though. 'Not Sure' if I'll be <1Hz accurate. Thanks for the FMT!! | |||||||||
| KD7KDO | AZ | W7 | DM33xm |
|
Method: FLDIGI 4.2.03 using IC-7300 calibration using HP3336B Soapbox: Thanks fur running the contest... my 3rd time I think. I hope my fellow W7MOT club members did well. | |||||||||
| KD8RV | MI | W8 | EN82mj |
|
Method: GPSDO locked Elecraft K3 spots the keydown. GPSDO locked SDRplay RSPDx IQ file synchronous AM DSB demod provides a record, sanity, and error check. Soapbox: Strong signals all around but a frustrating amount of doppler shifting on K5CM's 40 meter transmission and W8RKO's 80 meter transmission. No confidence in resolving measurements to a tenth of a Hz. Watching CHU's shifting at the same time mimicked the same. Thank you to K5CM and W8RKO and ARRL for the test! 73 Greg KD8RV | |||||||||
| KE6ZLX | CA | W6 | DM13ie |
|
Method: SDR receiver based on the MSI 001 and MSI 2500 chip set running SDRuno. Distill am bandstop filter. Mega loop ant MLA-30. U-BLOX LEA-M8T-0-10 Huawei GPS module controlled by Ublox U-Center in fixed mode providing reference freqs. (UNK freq - REF freq) + REF freq. Signals analyzed with Spectrum Lab. Results plotted and outliers removed. Mean of remaining measurements reported after applying fudge factors. Soapbox: Nice signals into San Diego. Thank you K5CM and W8RKO for putting on the FMT. Great fun! | |||||||||
| KK4KAZ | FL | W4 | EL88rm |
|
Method: BG7TBL GPSDO,RSPdx SDR locked to 24 MHz,RIGOL 2-Channel Signal/Waveform Generator for 1) 24 MHz Ref In clock into RSPdx and for 2) Frequency Marker ~ 100 Hz below FMT Target Frequency, and HP53131A Counter to confirm accurate Reference Frequencies, and Audio was recorded via RSPdx for accurate reading of Marker and Target Frequencies. NOTE: my estimate for W8RKO 40m is bound to be a ways off since I cut off the Target Frequency by having the upper end of the baseband filter too low! Stupid mistake! Soapbox: RSPdx SDR worked fine EXCEPT that audio recordings from RSPdx were worthless! Could have been me since I "assumed" that the recordings should have been good, and I didn't put much time into it! Fortunately, I had taken photos of each baseband display, and I was able to make crude estimates by measuring distances between Marker and Target spikes, and comparing to the display scale! I'll be "lucky" if any of my estimates come in less than 1 Hz off! BUT, FMTs are a fun activity, and exercise for my 78 year old brain! LOL! Thanks to K5CM, and W8RKO, and all others who put in the work to make this a great event! | |||||||||
| KM6QX | CA | W6 | CM87wv |
|
Method: Used active magnetic loop antenna into a Flex-1500 locked to a GPSDO. Analyzed the ~600 Hz CWU tone with Spectrum Lab. Selected most probable spectrum peak having a stable frequency, then corrected for Flex’s small DDS VFO offset. Soapbox: Good signal conditions until W8RKO 40m run. Did not hear or see any signal until after run, when I found his 1 minute of signal way below the noise floor captured on Spectrum Lab's paused waterfall. | |||||||||
| KN1H | NH | W1 | FN33sg |
|
Method: IC-7300 with SW facing EWE. Audio results sampled and averaged using Spectrum Lab and Excel. Went into FMT 'cold' without the usual calibrations and corrections, so results are a guess. Soapbox: Thanks to Connie and Michael for providing us with another fun FMT! Both stations 599 on both bands in nearly noiseless conditions. | |||||||||
| N0PFE | TX | W5 | EM00ul |
|
Method: Equipment: Elecraft K3, AV640 used on 80 meters with signals very attenuated due to mismatch on 80m. Zero beat WWV on 5MHz only then zero beat and examine Spectrum Lab frequency response with target signal. Soapbox: Doing these is a lot of fun. I opted for the tried and true ear to zero beat method. It continued to work well for me in the past anyway. Both bands seemed fairly stable and quiet for me. Fade was greater on 80m with W8RKO this time. However, this year I could hear both on both bands just fine although their signals were very attenuated due to me using a 40m vertical on 80 meters. (Still no 80m antenna yet). | |||||||||
| N1HAC | NH | W1 | FN33xp |
|
Method: Equipment: Kenwood TS-480SAT w/ high stability TCXO, Leo Bodnar GPSDO in-band reference, 40M Horizontal Loop antenna. Method: FLDIGI FMT mode, record key-down transmissions, bring up recorded spread sheet, account for receiver dF/F factor, reference offsets. Also, recorded WWV/CHU before and after to double-check and try to detect any Doppler Shift (none definitively noted, stable ionosphere). Soapbox: (none) | |||||||||
| N5TNL | AR | W5 | EM25ui |
|
Method: Longwire to RX-888 clocked by Trimble Thunderbolt GPSDO. ka9q-radio recordings post-processed using SDR Console, Fldigi, and Spectrum Lab. Soapbox: Doppler? What's that? | |||||||||
| N7WS | AZ | W7 | DM42jh |
|
Method: Bodnar GPSDO through stepped attenuator to directional coupler to SDR-IQ RX input. Bodnar set to ~600 Hz below received signal. Record AM demodulated spectrum via SpectraVue S/W for later analysis. Extract keydown portion of audio with Audacity S/W. Analyze with Spectrum Lab S/W. Soapbox: Conditions were rough, noisy signals and Doppler/multipath was a problem on all frequencies, I saw >30 dB fading at times. The W8RKO signal on 40-meters looked like two signals 0.3 Hz apart. | |||||||||
| N8OBJ | OH | W8 | EN91fh |
|
Method: FLEX-6500 w/ HP Z3801A GPSDO, Used both Gap Titan & 80M OCF Dipole, FLDIGI V4.1.18 in Freq Analysis Mode Soapbox: Clean Signals - Ionosphere was not too turbulent 1 Sigma Results: KC5M 40M 0.073 80M 0.115 W8RKO 40M 0.234 80M 0.020 | |||||||||
| N9BPL | FL | W4 | EL96wi |
|
Method: RSP Duo with Leo Bodnar reference Soapbox: Thanks to all who worked to make this possible. | |||||||||
| NA2SW | NJ | W2 | FM29na |
|
Method: (none) Soapbox: (none) | |||||||||
| SP5LST | DX | DX | KO02md |
|
Method: Ant: HyendFed Multiband up 20m. Kenwood TS-890S syncronized with GPSDO. SpectrumLab Soapbox: Thank you so much for the FMT test! This time there were bad conditions at 80 meters 73! Konstantin SP5LST | |||||||||
| VE2IQ | ON | VE | FN15nt |
|
Method: E-probe > TS850(external clock) > laptop soundcard. Record all transmissions & go to bed. Analysis: FFT centered on approx 800 Hz over keydown interval, use Quinn or R&A interpolation. Soapbox: I've been doing these for over 20 years now, thought I had seen it all. But this time took the cake, I'll be lucky to get in the green, hi! Thanks to K5CM, W8RKO - very strong signals here, smoothly run. | |||||||||
| VE3CXB | ON | VE | FN03ag |
|
Method: SDRplay RSPdx calibrated against CHU. Frequency read from the spectrum display. Soapbox: No green box this time around. A lot of QSB on both 40m signals but I was able to get some sort of reading off of them. K5CM signal on 80m was unusable as it was too weak, and W8RKO on 80m had too much Doppler and QSB. Even so it was a good learning experience. Thanks to all for organizing this event. Looking forward to the next one. | |||||||||
| VE3GSO | ON | VE | EN92ix |
|
Method: Bodnar GPSDO set 400-500Hz below unknown. Receiver in AM mode narrow filter. Measured beat with Spectrum Lab running with 68mH bins Soapbox: Good strong signals tonight, 10-15dB overS9. Some sky wave-ground wave fading on 40m W8RKO. Checked 5MHz WWV between runs and no doppler shifts seen in a quick minute of checking. | |||||||||
| W0DAS | CO | W0 | DN70kn |
|
Method: IC-705 w/ fldigi, Frequency Analysis mode, ~1-minute "line of best fit/guess" on an XY scatter plot in Excel. Soapbox: I hit a roadblock with a new IC-7610 and fldigi on a Mac; couldn't get them to talk. Is there an IC-7610 .xml file somewhere? I couldn't find it, just a couple of 7600.xml that were tweeked that didn't seem to initialize. So I fired up my IC-705, it's .xml talking fine to fldigi on a Win 11 pc, tuned to WWV groundwave, and then hoped I would be close. Great signals for K5CM and W8RKO w/ 40m both 599 +10 and 80m K5CM 599 + and W8RKO 579 73, Dave, W0DAS | |||||||||
| W0HBK | IA | W0 | EN42da |
|
Method: FT-920 Direct frequency measurement Soapbox: All signals 599+ in Cedar Rapids, IA. Thanks for conducting the FMT! | |||||||||
| W2FD | PA | W3 | EN91wx |
|
Method: ICOM 7100, TEK-535 SCOPE,HP-205AG AUDIO GENERATOR, HP-5385A COUNTER. Measure near 600 HZ. CW and CW-R audio output of transceiver with scope sweep synched by audio generator and generator frequency measured with counter to .01 Hz. resolution. Receiver calibrated with 15 MHz.WWV signal before the measurement session. Soapbox: Thanks to Connie, Mike and those involved at ARRL for another good FMT Session. All signals were very strong S9 + 15 dB or greater at my location. All signals had very noticeable frequency variations except for W8RKO on 80 M. | |||||||||
| W2TX | GA | W4 | EM74se |
|
Method: KWM-380() modified to have an internal 10 MHz standard which is locked to the output of a homebrew GPSDO. A soundcard, also locked to the GPSDO, is used to feed SpectrumLab SW. The offset from the dial frequency is read from SpectrumLab. Soapbox: There was both more fading and more Doppler than I expected for that late at night. | |||||||||
| W3FAY | MD | W3 | FM18ox |
|
Method: Kenwood TS-890S w/Leo Bodnar GPSDO reference; Inv L with SGC SG-230 autotuner; FLDIGI Freq Analysis. Average of measured Frequency readings in Analysis csv file during key down period. Soapbox: First time trying FLDIGI for FMT, so it'll be interesting to see how it worked out. Ran in Frequency Measurement Test mode on WWV 10 MHz AM prior to test. Goofed up on first signal as I didn't switch mode to USB when running Freq Analysis mode. Was able to catch/measure post key down signal. All sigs nice and strong in Bowie, MD. Thanks for running these FMTs. Lots of fun! 73, Denis | |||||||||
| W3JW | VA | W4 | FM17tq |
|
Method: IC7610 (external precision xtal osc) into Spec Lab Soapbox: Tnx to Connie, Mike and all that make the FMT events possible. Signals were typical; K5CM-S9+30 on 40M, W8rko-S9+25 on 40 M, K5cm-S9+15 on 80M and W8rko-S9+20 on 80M.Most notable artifact was "unusually large" shift of freq during W8rko 40M transmission. | |||||||||
| W4IVF | VA | W4 | EM96to |
|
Method: GPS phase-locked reference injected into receiver input. Frequency delta measured with Spectrum Lab software. Soapbox: Enough doppler to confuse me. Thanks to all. | |||||||||
| W5LAC | MS | W5 | EM51hh |
|
Method: Flex3000 calibrated with Leo Bodnar GPSDO, Spectrum Lab. Soapbox: Strong signals all around, some interference from LSB signal on 40 m | |||||||||
| W5SSV | TX | W5 | EL39ax |
|
Method: HP 3586 SLM GPS locked. 80-10 fan dipole. Soapbox: Another fun team effort at our clubhouse in Nederland, Texas. Noise was not a problem so no abatement required. No significant doppler observed. Thanks for putting it on again guys! | |||||||||
| W6BM | CA | W6 | CM87uv |
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Method: Hammarlund SP600-JX17 + four synthesizers + thunderbolt Soapbox: Lots of Doppler, good signals, RKO weak on 80 Thanks guys for the test | |||||||||
| W6OQI | CA | W6 | DM04vf |
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Method: HP3586B selective level meter with reference from GPSDO Soapbox: Good signals from both stations on 40 and 80with the usual Doppler shifting. | |||||||||
| W7SUA | AZ | W7 | DM34rs |
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Method: fldigi fmt modem. GPSDO controlled K4D, GPSDO controlled SDG2042X ref fed in RX loop on K4D at 1 mw and 30 db attenuation, 2 element beam on 40 up on 40 ft tower on ridge behind house, 160m OCF inv-v on 80m hung from the tower. In a RF quiet rural area. FMT modem ref was 300 Hz below nominal unknown freq and did not change when unknown higher than expected. Soapbox: Thanks Connie and Mike! Much fun. Also good to see that I can take good data using the fldigi FMT modem even with data modes in the background. Much fun! | |||||||||
| W8GNM | OH | W8 | EN81nn |
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Method: FlexRadio 6600M is frequency locked to 10MHz. Trimble GPSDO with 1Hz dial resolution. DAX digital audio transfer to Spectrum Lab. USB carrier frequency set to 100Hz below unknown frequency. Average audio frequency measured near 100Hz on Spectrum Lab was added to Flex dial frequency to get final measurement result. Both K5CM and W8RKO signals were S9+ on dipole Rx antennas. Lots of Doppler shift on W8RKO 80m signal. Soapbox: This is always a fun test. I hope to get into the green boxes again this year. 73, W8GNM | |||||||||
| W8TM | OH | W8 | EM79te |
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Method: K3 calibrated vs. 10 MHz WWV. Soapbox: With improved indoor antenna/tuner, all signals peaked S7 to S9. | |||||||||
| W8WTS | OH | W8 | EN91jj |
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Method: Bodnar mini as reference, receiver is FT-1000MP with my design REF module that is referenced to a separate Bodnar mini. Signal processing by Fldigi 4.1.23. Soapbox: Signals were generally good on all four runs. I hope that W8EDU posts an entry. The standard deviations of my post-processed vectors are, CM/40: 0.0703, RKO/40:0.0461, CM/80: 0.0486, RKO/80: 0.0249. The standard deviations make sense given that CM is 1370 km from me and RKO is 312 km away, both in nearly the same direction. | |||||||||
| W9GR | CA | W6 | CM99mg |
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Method: FlexRadio 6500 locked to Trimble GPS, with correction of DDS frequency errors. Denon SD card audio recorder produces stereo wav file with FlexRadio output on the right channel, and a 2 kHz tone on the left channel from HP3325A signal generator locked to GPS for sampling rate correction. Homebrew GNU Octave code measures audio tone frequencies and applies corrections for sampling rate error. Soapbox: Always fun, thanks to K5CM and W8RKO. And while I'm on the soapbox, I will rant about the chip makers who produce DDS chips (and FPGA cores) for direct frequency synthesis. Why do you always use a BINARY phase accumulator? That produces goofy frequency steps like 100 MHz/2^32 = 0.023283064365386962890625 Hz. That is NOT a useful step size for radio purposes, especially for the FMT. Please include an option for a DECIMAL phase accumulator, which counts to an integer power of 10, so we can have EXACT frequency steps of 0.1 Hz, 0.01 Hz, 0.001 Hz, etc. using radio-friendly clock frequencies like 100 MHz, 1 GHz, etc. Down with binary DDS frequency errors! | |||||||||
| W9INE | CO | W0 | DN70gi |
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Method: FLEX-6700 & FLDIGI in "FREQ ANALYSIS" mode. Soapbox: Signals were strong. The S/N ranged from 45 dB to 55 dB. There was significant QSB but the frequency deviation was slightly less than November 2023. Thanks for all who contribute to this event. I like the later start time (03Z). | |||||||||
| W9MDB | IL | W9 | EM49hv |
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Method: IC-7300 with FLDigi FMT mode and Bodnar Mini GPS for reference. Soapbox: On K5CM 40M forgot to record so number is what I remember. Some Doppler but not too bad on all 4. I only recorded 1 second intervals so statistics really aren't worth reporting (standard deviation is of interest to show stability). | |||||||||
| WA1SXK | NC | W4 | EM95lf |
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Method: IC-7300 using Bodnar GPSDO REF signal. Record FMT test signal data using FLDIGI in FMT mode. Plot Data on charts and view to eliminate doppler effects. Soapbox: K5CM 80M .086 SD 40M .079 SD. (SD in Milli HZ) W8RKO 80M .160 SD 40M .024 SD. (SD in Milli HZ) ------------------------------------- Good signals from both stations, no fading on all bands in NC. No QRM on signals during FMT recordings. Heard Doppler effects with my ears as pitch changed on signals when the biggest doppler Freq. shifts occurred. Thank you both for performing the FMT for us, hope to hear you both in Nov. 2024 Best of 73 to all. Eric/wa1sxk | |||||||||
| WA2DVU | NJ | W2 | FM29nc |
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Method: 3586b, sl, gps locked. Soapbox: (none) | |||||||||
| WA2USJ | NY | W2 | FN30bq |
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Method: Kenwood TS-570D Soapbox: 73,Thank you | |||||||||
| WA5UCW | NM | W5 | DM65sd |
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Method: DIY direct conversion receiver with quadrature sampling detector, Leo Bodnar GPSDO as master oscillator, polyphase filter network, 7th order elliptical low pass audio filter, horizontal loop antenna. WSJT-X and Spectrum Lab to measure and log FMT data, Scilab and Excel to analyze and plot results, WWV over long-term interval for calibration. WWV over long-term interval for calibration. Soapbox: Generally strong signals with significant ionospheric propagation effects, both Doppler and short term variability. S/N ratios: K5CM_40m 55dB, W8RKO_40m 40dB, K5CM_80m 40dB, and W8RKO_80m 30dB. W8RKO on 40m had 2 frequency components about 0.7 Hz apart. K5CM on 80m had 2 frequency components about 0.35 Hz apart. Thanks to Connie, Michael, and ARRL for conducting this event. | |||||||||
| WA7BNM | CA | W6 | DM04td |
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Method: Receiver: Icom R-8600 Antenna: SteppIR DB-36 at 70 ft - used 40m setting for both bands Software: Fldigi 4.1.26 in Freq Analysis mode Used GPSDO as external frequency reference for R-8600. Averaged Fldigi measurements during middle 30 sec of key-down period. Soapbox: Signals in S.Calif: K5CM: 40m: S9+20, 80m: S6-7 W8RKO: 40m: S9 +0-20, 80m: S5-6 | |||||||||
| WA7X | UT | W7 | DN40cq |
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Method: GPSDO feeding a reference to HP Signal Generator, then comparing signals to each other with Spectran. Some math (hopefully good) and measured frequencies. Soapbox: Some broad foreign SSB on 40 crossing over signal, but didn't appear to degrade measurements. A digi signal on 80, but changing antennas I could keep it out of the measurements. W8RKO on 80 had some Doppler. | |||||||||
| WB2CMF | NY | W2 | FN30lu |
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Method: Kenwood TS-2000, Cushcraft R8 Vertical for 40Meters, End Fed Dipole for 80 Meters, HP Win 10 Desktop, Rigblaster PC Interface, Fldigi software v4.0.20 in frequency analysis mode. Soapbox: 40 meter signals were good. 80 meter K5CM was weak with lots of fading. 80 meter W8RKO signal was good, but also with some fading. | |||||||||
| WB7ABP | CA | W6 | CM88ok |
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Method: Anan-100D Fldigi Soapbox: Thanks | |||||||||
| WB8REI | OH | W8 | EN81jc |
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Method: Trying to teach myself a new method. New software, different hardware. Used FLDIGI and did not connect serial port. Spent to much time tuning radio then putting correct freq in FLDIGI. 1 minute didn’t leave much time. Will have serial port wired next time:) USED AN ICOM-IC718 ( no high stability osc ) also used an HP 8935 signal gen with modified E-MU 0202 ext sound card both locked to GPSDO. Had some issues with my spreadsheet data, using different spreadsheet software. Soapbox: Had a BLAST! Probably didn’t measure very well however I’m learning a lot. Sometime you have to change things up to teach yourself new things. Thanks again to Connie and Mike. Look forward to these events every year! Thanks to John and Ding for steering me toward the modified sound card. Had a great time doing the modification and installing the board. Even thou I probably didn’do so good this time around it has been an eye opener and a great opportunity to learn new things! Thanks guys for trying to guide me and teach me some really cool stuff! | |||||||||
| WQ8T | MI | W8 | EN74hf |
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Method: Equipment: HF2V antenna, an HP 3586C with an internal GPSDO, an RSP1A and a computer running SDRuno and DL4YHF's Spectrum Lab software to analyze a 15.625 kHz IF signal from the HP 3586C. Method: The RSP1A is used to find the frequency of the call-up signal and then the HP3586C is tuned to this frequency. SpecLab is used to determine the frequency of the peak of the IF signal from the HP3586C. The change of this value from 15.625 kHz is subtracted from the HP 3586C frequency setting to determine the received frequency. The sound card is calibrated using SpecLab’s continuous calibration using a 10 kHz reference signal, also from the HP3586C. Soapbox: Thank you K5CM and W8RKO. | |||||||||