Results - April 9, 2021 FMT
|Actual Radio Frequencies (Hz):|
K5CM,W8RKO All (<=1.0 Hz):
AA6LK, AB1UY, AD5MT, AF9A, AJ5P, K3KSB, K4PPK, K5CM, KD5HIP, KD5MMM, KE5O, KI5EE, KM6QX, KM6VHD, KQ6RS, N1JEZ, N3CRT, N5NHJ, N6LKA, N7WS, N8OBJ, N9BPL, N9CIF, VE3YX, W2FD, W2TX, W4IVF, W4TP, W4WJ, W5AJ, W5LAC, W7SUA, W8DPK, W9GR, W9INE, WA7BNM, WC0Y, WD4EGF, WQ8T
K5CM 80 (<=1.0 Hz):
AA3I, AA6LK, AB1UY, AB2UW, AC8NE, AC9LV, AD5MT, AD8Y, AF9A, AI6RE, AJ4YA, AJ5P, GW4BVE, K0VW, K0WM, K2LYV, K3KSB, K4PPK, K5CM, K5RKS, K6FOD, K6LL, K8DJR, K9XT, KA5QEP, KA8BRK, KD2BD, KD5FX, KD5HIP, KD5MMM, KE0NRE, KE5O, KE6ZLX, KF7NP, KG5X, KI5EE, KM6QX, KM6VHD, KQ6RS, N1IRO, N1JEZ, N3CRT, N3FG, N5LUL, N5NHJ, N6LKA, N7WS, N8OBJ, N8TW, N9BPL, N9CIF, N9KT, NO6B, VE2IQ, VE3GSO, VE3OAT, VE3YX, W2FD, W2TX, W3FAY, W3JW, W4EDX, W4IVF, W4TP, W4WJ, W5AJ, W5LAC, W6BM, W6OQI, W7SUA, W8BL, W8DPK, W8EDU, W8WTS, W8ZZZ, W9GR, W9INE, W9TN, W9ZB, WA4FJC, WA5UCW, WA7BNM, WA9FDO, WA9WTK, WB5MJM, WB6HYD, WC0Y, WD4EGF, WQ8T
K5CM 80 (>1 to <=5 Hz):
AA0CL, AJ6GZ, K8WXQ, KB2HSH, N3RF, WA7X
K5CM 80 (>5 to <=10 Hz):
K5CM 40 (<=1.0 Hz):
AA6LK, AB1UY, AB2UW, AC8NE, AD5MT, AD8Y, AF9A, AI6RE, AJ5P, AJ6GZ, GW4BVE, K0WM, K3KSB, K4PPK, K5CM, K5RKS, K6FOD, K6LL, K6UM, K8DJR, K8WXQ, K9XT, KA8BRK, KD2BD, KD5HIP, KD5MMM, KE0NRE, KE5O, KE6ZLX, KF7NP, KG5X, KI5EE, KJ6HYC, KM6QX, KM6VHD, KQ6RS, N1IRO, N1JEZ, N3CRT, N3FG, N5NHJ, N6LKA, N7WS, N8OBJ, N8TW, N9BPL, N9CIF, N9KT, NO6B, VE2IQ, VE3GSO, VE3OAT, VE3YX, W2FD, W2TX, W3FAY, W3JW, W4EDX, W4IVF, W4TP, W4WJ, W5AJ, W5LAC, W6BM, W6OQI, W7SUA, W8BL, W8DPK, W8WTS, W8ZZZ, W9GR, W9INE, W9TN, W9ZB, WA5UCW, WA6VPJ, WA7BNM, WA7X, WA9FDO, WA9WTK, WB6HYD, WC0Y, WD4EGF, WQ8T
K5CM 40 (>1 to <=5 Hz):
AA0CL, AJ4YA, K0VW, KB2HSH, N3RF, W8EDU, WB5MJM
K5CM 40 (>5 to <=10 Hz):
K5CM 30 (<=1.0 Hz):
AA3I, AA6LK, AB1UY, AB2UW, AC8NE, AD5MT, AF9A, AI6RE, AJ4YA, AJ5P, K0VW, K0WM, K2LYV, K3KSB, K4PPK, K5CM, K8DJR, K9XT, KA5QEP, KD2BD, KD5HIP, KD5MMM, KE5O, KI5EE, KM6QX, KM6VHD, KQ6RS, N1JEZ, N2GL, N3CRT, N3FG, N5NHJ, N6LKA, N7WS, N8OBJ, N8TW, N9BPL, N9CIF, VE2IQ, VE3GSO, VE3OAT, VE3YX, W1KU, W2FD, W2TX, W3FAY, W3JW, W4IVF, W4TP, W4WJ, W5AJ, W5LAC, W7SUA, W8BL, W8DPK, W8EDU, W9GR, W9INE, W9TN, W9ZB, WA4FJC, WA6VPJ, WA7BNM, WA7X, WA9FDO, WA9WTK, WB5MJM, WC0Y, WD4EGF, WQ8T
K5CM 30 (>1 to <=5 Hz):
AD8Y, K8WXQ, K9KJ, KB2HSH, KE0NRE, KE6ZLX, KF7NP, N9KT, W6BM
K5CM 30 (>5 to <=10 Hz):
W8RKO 80 (<=1.0 Hz):
AA0CL, AA3I, AA6LK, AB1UY, AB2UW, AC8NE, AD5MT, AD8Y, AF9A, AI6RE, AJ5P, AJ6GZ, GW4BVE, K0VW, K0WM, K2LYV, K3KSB, K4CXX, K4PPK, K5CM, K5RKS, K6FOD, K6LL, K8DJR, K9XT, KA5QEP, KA8BRK, KD2BD, KD5HIP, KD5MMM, KE0NRE, KE5O, KE6ZLX, KF7NP, KG5X, KI5EE, KJ6HYC, KM6QX, KM6VHD, KQ6RS, N1JEZ, N2GL, N3CRT, N3FG, N3RF, N5LUL, N5NHJ, N6LKA, N7WS, N8OBJ, N8TW, N9BPL, N9CIF, N9KT, NO6B, VE2IQ, VE3GSO, VE3OAT, VE3YX, W2FD, W2TX, W3FAY, W3JW, W4EDX, W4IVF, W4TP, W4WJ, W5AJ, W5LAC, W6BM, W6OQI, W6SKD, W7SUA, W8BL, W8DPK, W8EDU, W8WTS, W8ZZZ, W9GR, W9INE, W9TN, W9ZB, WA4FJC, WA5UCW, WA6VPJ, WA7BNM, WA7X, WA9FDO, WA9WTK, WB5MJM, WB6HYD, WC0Y, WD4EGF, WQ8T
W8RKO 80 (>1 to <=5 Hz):
W8RKO 80 (>5 to <=10 Hz):
W8RKO 40 (<=1.0 Hz):
AA0CL, AA6LK, AB1UY, AB2UW, AC8NE, AD5MT, AD8Y, AF9A, AI6RE, AJ5P, AJ6GZ, GW4BVE, K0VW, K0WM, K3KSB, K4PPK, K5CM, K5RKS, K6FOD, K6LL, K8DJR, K8WXQ, K9XT, KA5QEP, KA8BRK, KD2BD, KD5FX, KD5HIP, KD5MMM, KE5O, KE6ZLX, KF7NP, KG5X, KI5EE, KJ6HYC, KM6QX, KM6VHD, KQ6RS, N1IRO, N1JEZ, N2GL, N3CRT, N3FG, N5LUL, N5NHJ, N6LKA, N7WS, N8OBJ, N8TW, N9BPL, N9CIF, N9KT, NO6B, VE2IQ, VE3GSO, VE3OAT, VE3YX, W2FD, W2TX, W3FAY, W3JW, W4EDX, W4IVF, W4TP, W4WJ, W5AJ, W5LAC, W6BM, W6OQI, W7SUA, W8BL, W8DPK, W8WTS, W8ZZZ, W9GR, W9INE, W9TN, W9ZB, WA4FJC, WA5UCW, WA6VPJ, WA7BNM, WA9WTK, WB6HYD, WC0Y, WD4EGF, WQ8T
W8RKO 40 (>1 to <=5 Hz):
KA1AL, N3RF, W8EDU
W8RKO 40 (>5 to <=10 Hz):
W8RKO 30 (<=1.0 Hz):
AA6LK, AB1UY, AD5MT, AD7TM, AF9A, AJ5P, AJ6GZ, K2LYV, K3KSB, K4CXX, K4PPK, K5CM, K6FOD, K6LL, K6UM, KA5QEP, KD5HIP, KD5MMM, KE0NRE, KE5O, KE6ZLX, KF7NP, KG5X, KI5EE, KJ6HYC, KM6QX, KM6VHD, KQ6RS, N1JEZ, N3CRT, N5NHJ, N6LKA, N7WS, N8OBJ, N9BPL, N9CIF, NO6B, VE3YX, W2FD, W2TX, W4IVF, W4TP, W4WJ, W5AJ, W5LAC, W6OQI, W6SKD, W7SUA, W8DPK, W9GR, W9INE, WA5UCW, WA6VPJ, WA7BNM, WB5MJM, WC0Y, WD4EGF, WQ8T
W8RKO 30 (>1 to <=5 Hz):
AD8Y, AI6RE, W1KU, W8ZZZ
W8RKO 30 (>5 to <=10 Hz):
K0WM, N5LUL, VE3GSO, WA7X
|Method: Naked Elecraft K3 calibrated to WWV, tuned by ear to zero beat with CW sidetone. Indoor mag-loop antennas.|
Soapbox: I must not have tuned wide enough on 30m. Nothing heard.
|Method: TS590S transceiver with a laptop running WSJT-X in freq cal mode.|
Calibrate standard frequencies and make corrections to measured results using an excel spreadsheet.
|Method: Used GPDSO-locked HF synth to generate a beat tone in receiver. Used GPDSO-locked LF synth to tune for minimum phase slip of beat tone as observed on o'scope.|
Soapbox: Thanks Connie and Michael for running the event. Not sure I captured K5CM 30M correctly after his keyer broke. Generally weak signals all around with lots of variation.
|Method: SDRPlay RSP2 with SDR UNO software|
Soapbox: Tried makeing measurements directly from SDRuno software, without getting a sound card involved.
|Method: 98' long W5GI dipole oriented E-W connected to Icom IC-7000 (CW mode). SignaLink interface to laptop running Spectrum Lab. During call up, adjusted a GPSDO (Trimble Thunderbolt) referenced, HP 3335A frequency synthesizer to about the same frequency. After key-down, switched the radio input to the synthesizer (through an adjustable attenuator) and adjusted the synthesizer to the same frequency as seen on the waterfall. Read each frequency directly off the synthesizer. No radio or computer sound card calibration is needed with this method, but warmed both up for several hours so they were stable during the FMT.|
Soapbox: Only had a few seconds of K5CM 30m signal, so measurement won't be too accurate. Heard NO signal at all from W8RKO on 30m. 40m & 80m readings should be reasonable.
|Method: Flex Radio, WSPR|
Soapbox: Didn't hear W8RKO on 10 meters
|Method: FTDX101MP as front end fed into (calibrated) SDR Play...|
Soapbox: Poor and noisy band conditions here. Could only copy K5CM 80m
|Method: IC-R8600 w/external ref and WSJT|
Soapbox: Big thank you to the team for putting this on.
|Method: Test signal from HP33120A generator phase locked to undisciplined Rb oscillator. On air signal compared to test signal with R71 receiver and Spectrum lab.|
Soapbox: Unable to hear K5CM on 30m, minor QRM on W8RKO 80m.
Thanks to all for setting this up!!
|Method: ICOM IC-7610, Leo Bodnar Mini GPSDO, fldigi FMT mode in Windows 10, dipole antenna.|
Soapbox: Lots of equipment problems this time--the transceiver, flrig, and fldigi did not want to play together. Very little Ohio signal on 30 meters, other signals were all at least fair. Thanks for running this show, K5CM, W8RKO, ARRL!
|Method: Open HPSDR Mercury recvr with 10MHz OCXO calibrated to WWV, CHU. Measurements with WSJT-X FreqCal mode.|
Soapbox: W8RKO 30m signal was a challenge here in Indiana. On my spectrum display with an FFT bin width of 2.9Hz, the keydown signal was 10dB above the noise at best. Other signals were all 20dB or more above the noise. Thanks for another good FMT!
|Method: GPS Locked Flex 6600 offset 100hz and offset measured with "G String Tuner" app on Samsung S20 5g cell phone. Check error against WWV on 5mhz and 10 Mhz. Antennas are a Steppir dipole on 30m and 40m and a Cushcraft R9 Vertical on 80M.|
Soapbox: All six signals were good in San Jose and hopefully I did all the addition correct for the final results.
|Method: Elecraft K3s and zero beat to 'spot' tone. For 40m and 30m I used a fan dipole cut for those bands. For 80m I used a new End Fed wire antenna cut for 80m. This new antenna helped quite a bit.|
Soapbox: For the 30m run I lost the signal a few seconds after it began, but heard a tone about 5 mins later so I measured that. I have no idea if it was the correct tone. I could not hear W8RKO well enough to measure. Again, I had blast. Thanks.
|Method: Icom 705, fl-digi, indoor loop|
Soapbox: 30 m was very weak, backscatter? 40 was strong. 80 M noisy
|Method: IC-7610 with RFzero GPSDO reference. Small error in IC-7610 QRG corrected. Doppler estimated using CHU.|
Soapbox: Nothing heard on 30m :-) Could have made some errors as tests were in the early hours in GW and I was half asleep!!
|Method: Kenwood TS-890 calibrated w/WWV.|
Soapbox: Thanks for the challenge, lots of fun, keeps the grey cells active.
|Method: Measured receiver audio frequency in CW mode for unknowns and GPSDO standard. Used spreadsheets developed over several FMTs to calibrate receiver, correct for drift and calculate unknown frequencies.|
Soapbox: Strong steady signals for all runs. Thanks to Connie and Michael for continuing to support this interesting event.
|Method: Use WSJTX to give correction. Use Fldigi FMT mode to get "raw" frequency, then correct using calibration parameters from WSJTx.|
|Method: IC-7300, FLDIGI FMT mode.|
Soapbox: My CSV files were corrupted, so I'm flying blind.
|Method: Sloping multi-band nested Vee antennas (sloping 15 to 5 feet) favoring NW helped provide test signals for all frequencies. Also used local indirect referenced GPS frequency reference.|
Soapbox: Tried mixture of techniques with some suspected disappointing results. The decrease in the key down measurement time will accelerate some measurement improvements. As always, our thanks to K5CM and W8RKO for their sponsorship.
|Method: Icom FT-7000, CW, Tune to whole 1KHz points lower, use Android Spectroid app, Rx WWV, Tone noted for reference.cal, RX test station signals, measure tone, apply correction factor.|
|Method: Ten-Tec Omni VI Plus Vertical|
Soapbox: First attempt at FMT. Signals were poor on 30 meters but strong on both 40 and 80 meters.
|Method: Used and Icom 7300 linked to my computer running FLDigi set to the Frequency Measuring Mode. Calibrated the radio/software using WWV and established a baseline. Measured the transmitted tone and used the difference between the two as a plus or minus to the dial frequency.|
Soapbox: As always, it was a hoot.
|Method: For RX: HP-Z3801, HP-3336, K3 in AM mode, Spectrum lab, Ant: 500 ft beverage pointed North East.|
Soapbox: Mike's signal was good copy on all three bands. Because of my equipment problems on 30 M TX, measuring Mike on 30 meters was tight, but I did get most of his key down.
|Method: Injected signal from HP3336B into receiver along with signal from antenna using coax T connector. Observed signal graphically on spectrum display and noted peaks for injected signal and signal from antenna. Used homebrew software using FFT.|
Soapbox: 80m and 40m signals were solid.
I discovered software bug during 30m runs. This bug has been in my software for years and never showed up because this is the first time the FMT used 30m and the bug was only present on 30m runs. I ran a few test runs using WWV on 10Mhz and had results within 0.2 Hz of 10Mhz so I thought things were OK with the software. My bug was related to not considering that the 30m band from 10.10 to 10.15 was a legitimate ham band. My bug was that I was defining the 30m band to go from 10.15 to 10.15 Mhz. That bug caused my view of the band to be VERY NARROW. Specifically ZERO!
|Method: 24-foot receive-only broadband vertical antenna, HP3586B receiver + HP3336B signal generator (both referenced by Trimble Thunderbolt), displayed as Lissajous pattern on T922 analog scope in XY mode.|
Soapbox: K5CM's 30m signal was too weak to measure. The other five looked good. Noise increased progressively on lower bands, but overall wasn't bad. Thanks to Connie and Mike for a fun event!
|Method: K3 without TCXO. That's it.|
Soapbox: My first ever FMT. I just wanted to see how close I could come without any special equipment. I hope I didn't embarrass myself!
|Method: Elecraft K3 with EXTREF option|
Packrat Homebrew GPS disciplined 10 MHz oscillator
WB0OEW GPS Source (QEX Sept/Oct 2018)
Soapbox: Impossible to do all 6 during dinner hour.
K5CM 30m was botched as the phase noise of the GPS source is high and covered signal. Added a 30dB attenuator for W8RKO.
Measured 10M WWV at 0115z: 9,999,999.848
|Method: Icom IC-7300 calibrated to WWV with beats against 1000 Hz audio tone. Used same method to interpolate received FMT frequencies.|
|Method: ICOM IC-756PROIII Calibrated to WWV and using the 50Hz CW Filter.|
Used FLdigi to Calibrate the 600Hz Pitch on the ICOM.
Soapbox: Thanks to K5CM and W8RKO for a job well done. Great Signals on all 3 Bands herein Michigan.
73's to everyone that participated in the ARRL FMT and always fun.
|Method: Sorry - forgot to add frequency error correction|
|Method: Flex 6500 (V3.2.31) with Trimble Thunderbolt GPSDO and Pixel Loop antenna. |
Flex 6000 series receiver calibrated for each frequency using Ron Panetta, WB2WGH, FMT procedure. (Flex documentation)
WSJT-x (V2.3.1) using FreqCal application.
Meinberg NTP timeserver NTPD 4.2.8p15-o used to set PC clock.
I-7 PC running Windows 10 Pro.
Multiple measurements (minimum 26) taken each Key Down run and averaged using Excel.
Soapbox: First FMT. It was a lot of fun and I learned a lot about my radio and the software I use. Unable to copy W8RKO on 30M (too close - only 150 miles away). Strange problem with K5CM 30M run. Signal dropped after call up. I copied the signal that came up after the drop, no matter who the transmitter was. Suggest in future Tests the transmitting station QRS just a little bit!
|Method: AVALA-01 SDR, QUISK software|
|Method: Receiver Harris RF-590. Audio was recorded and analyzed with signal processing software written in Mathematica language.|
Soapbox: Overall, very good conditions on all frequencies. Some uncertainty in the frequencies on 40m.
|Method: Icom Ic-706 MKII, 80m inverted vee, WSJT-x, Excel|
Soapbox: Wish I had waited for K5CM on 30M, No signal at all from W8RKO on 30, weak signal from W8RKO on 40. Good signal from Connie on 40 and 80. Super strong signal, 50-60 over S9, from W8RKO on 80.
TNX to all who help with this test.
|Method: CAT-controlled FT-817 and fldigi.|
Soapbox: Still having fun with the FMT even though I do pretty lousy at it. 73 de KB2HSH
|Method: All homebrew equipment including a carrier phase tracking receiver, a WWVB referenced frequency standard, end-fed 40 foot wire 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: http://www.qsl.net/kd2bd/fmt-methodology.html|
Soapbox: The solar flux was 74 and Kp-index was 1. No copy of W8RKO on 30 meters. Found K5CM after his TX mishap with a rock-solid signal and a 0.15 Hz p-p FM deviation in readings. On 40, W8RKO had only a 0.05 Hz p-p FM deviation as did K5CM on 80. If only stability implied accuracy... TNX ALL ES GL 73.000 de John, KD2BD
|Method: Flex 6300, no 10 MHZ input, calibrated w/ Spectrum Lab to WWV 2.5, 5.0, and 10.0. Data captured with Spectrum Lab too.|
Soapbox: Good signals except for 30 meters from Connie, he's too close to me for that band.
|Method: ICOM IC-756PRO to RigExpert Standard to MixW v3.2.105 software. I just read the frequency off the MixW screen. I have checked calibration to 10-MHz WWV and it was better than 1 Hz.|
|Method: used FT-847, SpecLab and Excel. Forgot how to use FLDigi!|
Soapbox: K5CM dropped off on 30m just after key down, heard a sig near the same freq a minute or so later, used that.
Nice to have 6 freqs to measure, Thanks K5CM & W8RKO!
Also, I don't remember ever doing FMT on 30m!
73 all ..
|Method: 40m OCF dipole, IC-7300, LDG antenna tuner, Leo Bodnar Precision GPSDO, fldigi, HP Windows 10 laptop, Microsoft Excel|
Soapbox: After tuning by waterfall display to within 5 Hz of the key-down signal, I fine tuned fldigi's strip chart display to within 0.1 Hz and logged frequency measurements every 0.1 sec for the duration of each test. Then I set the GPSDO to the nearest 1 kHz and logged its fldigi measurements for 1 min to determine the 7300's calibration error. I used Excel to average over each test and GPSDO measurement interval and subtract the 7300 calibration error to obtain the estimate of the test frequency.
|Method: GPS disciplined HP 3586B in counter mode. Inverted V on 30 & 40. Full dipole on 80.|
Soapbox: Low receive levels on 30 and QRM and QRN on 40 & 80. TNX agn for a good time with the FMT! 73, Steve ke5o
|Method: Nooelec NESDR smart, Ham it up v1.0, Distill am bandstop filter. Mega loop ant MLA-30. GQRX and Fldigi FMT on a linux box. Goouuu Tech GT-U7 GPS module providing reference freqs. (REF freq - UNK freq) + GPS freq.|
Soapbox: Strong signals into San Diego. Thanks for a challenging and fun event.
|Method: Same equipment as always. An RSP2 Pro SDR with the external 24MHz reference input driven by a home brew GPS Disciplined oscillator. The software is SDR console which in later versions has a fixed error in it's frequency calculation that needs to be subtracted. A virtual audio cable is used to drive the audio to the WSJT-X software. This prevents the audio from being resampled and introducing another error. WSJT-X is configured in the frequency calibration mode which allows you to measure the audio frequency to 3 decimal places.|
Soapbox: Thanks to K5CM and W8RKO for putting on the FMT. I had fun as always. The first 30 meter transmission was a little short but I was able to get a reading. The signals were all reasonably strong with lots of QRN on 80 meters. I live in an HOA restricted development so my antennas consist of Hustler whips on my second story deck. I also usually have an s6+ noise level.
|Method: RSPDUO, CHA-250B vertical antenna|
Soapbox: No K5CM 30m signal heard this QTH. Lots of doppler shift.
|Method: Kenwood TS-2000 with a 40 meter and 20 meter inverted V antenna. Radio audio feed into computer using Spectrum Lab program.|
Soapbox: Radio signal were good except for K5CM 30 meter. I was still able to get frequency result for K5CM but a lot of doppler. All other frequencies were strong.
|Method: Temperature stabilized the IC-7610 for 8hrs, used 2.5k span & set for best resolution, calibrated to WWV to get freq correction factor, using 7610 waterfall display and magnifying glass to get test freq. digital reading, applied correction factor and reported.|
Soapbox: I do not have confidence in the below readings, reason stated.
K5CM 80M intermittent signal at my location, my reading 3597391 K5CM 30M QRM at my location, my reading 10102747
|Method: Used a Pixel magnetic loop antenna into a Flex-1500 locked to a Fury GPSDO. Analyzed the ~600 Hz CWU tone with Spectrum Lab. Selected most probable spectrum peak, then corrected for Flex’s small DDS VFO offset.|
Soapbox: All strong signals received here near San Francisco on magnetic loop antenna. The new frequency shift protocol between call-up and key-down, was an interesting new wrinkle to deal with. However, the strong 80 meter RTTY QRM (in northern CA) was a bit nasty.
|Method: Yaesu FT-450D in USB mode with audio output into an audio recorder. I recorded the FMT transmissions and also WWV 10, CHU 7.85, WWV 5, and CHU 3.33 between FMT transmissions (noting the displayed transceiver frequencies). Then I opened the audio files in sonic-visualiser, estimated the audio frequencies, added the results to the displayed frequencies, then added corrections based on the errors for the nearest WWV/CHU frequencies.|
Soapbox: My first FMT. I have no idea how accurate my method is, but this was a good exercise. Thanks for running the event!
|Method: Fldigi and a Bodnar GPSDO into an Icom IC-7300. Measured 5 MHz WWV before and after each run to estimate doppler.|
Soapbox: First time participating in a FMT event.
|Method: Kenwood TS-2000, Bodnar GPSDO, FLDigi 4.1.17, G5RV antenna|
Soapbox: Trying out FLDigi, a little confusing. Hope I didn't mess up the
observation. Tough to get all 6 I bet! Thanks for doing it!
|Method: OpenHPSDR Hermes SDR locked to Lucent RTFG-u GPSDO. Audio feeding Fldigi.|
Soapbox: This is my first time doing the FMT. W8RKO 30M signal was quite weak, but all others were OK.
|Method: 160/80M dipole,HP3586A selective level meter referenced to HP Z3816A GPS frequency standard|
|Method: Flex 6400 and WWV as reference - OLD FLdigi Frequency Analysis mode spit out to spreadsheets. Averages taken. Corrected using WWV measured errors.|
Soapbox: Almost no copy on W8RKO 30m. All other runs very strong signals with some QSB here and there. Quiet night, no static crashes. Lots of fun as usual! Thanks All!
|Method: K3, 40M dipole, WWV, CHU, Spectran|
Soapbox: Didn't hear W8RKO on 30M for some reason. All other signals were solid.
As usual, many thanks to both stations for another fine event.
|Method: HP 8657B Signal Generator + SpectrumLab through a Ten-Tec Orion II transceiver|
Soapbox: Some "first FMT jitters" and technical flubs resulted in nothing heard on the first K5CM 30m transmission
|Method: Yaesu FT920 Zero beat to WWV on 10Mhz for 30m and 5Mhz for 80 & 40.|
Create correction factor for each range and apply.
Soapbox: 1st 30M entry is a WAG. 2 interfering stations gave me probs on W8RKO 30M. I'll just wait and see how the other 4 tries played out.
Feel much better about 40 & 80.
|Method: FLEX 6400 GPS LOCKED, WSJT-X IN CALIBRATION MODE, AVERAGING|
Soapbox: What happened to K5CM's first run? I'm not sure if I got the right carrier. A better time accuracy will be appreciated. Next time I'll try to understand how to measure the doppler.
|Method: Win4Icom Suite spectrum waterfall to show signal, WSJTx, IC-7610 with GPSDO reference signal input, and wire dipole antenna. Calculated ionospheric variance by comparing received signals from WWV for fine-tuning.|
Soapbox: 30m and 80m was a bit tough for me to copy the signal due to my antenna setup. Lots of fun.
|Method: Primary RX: SDR-IQ running SpectraVue SW, Gross frequency read with TS-890 for sanity check. Injected ref signal from DG8SAQ VNWA in sig gen mode with GPSDO external reference. AM demodulated signal recorded for analysis. Analysis with SpectrumLab and/or Daqarta software after some clean up with Audacity.|
Soapbox: The K5CM 30-meter hiccup got me off task. If I'm within a few Hz I'll be surprised. I copied W8RKO so-so on 30-meters but my TS-890 numbers differ from the SDR numbers by 9 HZ or so. We'll see how this pans out. But my biggest problem was with the K5CM 80-meter signal. I couldn't believe this freq was used as there was huge QRM from a digital station, here in the southwest anyway. My results on this one are a SWAG.
Although I greatly appreciate the efforts of the two transmitting stations, I'm not fond of the constant tinkering with the format. One minute key down is too short IMHO and the need to copy six different signals is a stretch, as I'm sure some who couldn't copy some signals at all will agree.
Still it was fun and I'll do it again next time.
|Method: Flex-6500, HP Z3801A GPSDO, 80M OCF Dipole Ant, FLDigi Ver 4.1.18 in Analysis Mode (FMT mode doesn't track too well [it looses it] in the turbulent ionosphere I have to deal with here in NE Ohio)|
Soapbox: W8RKO was non existent on 30M using Vert ant (GAP Titan) - in noise floor on horz dipole. Must have been going right over the top of me...
Fair amount of QRM on 80M. What happened to KC5M on 30M - blow a fuse after 1 sec? Good comeback tho!
Nice job to both KC5M and W8RKO
|Method: Reference Signal Offset (USB Mode): GPS-Disciplined Rb Standard into a Fluke 6070A SigGen. Rig is a 1983 Yaesu FT-980.|
Soapbox: Could not pull the W8RKO 30M signal out of the noise, but all other test signals were "booming". Next time might try a Drake 2B to reduce phase noise ;)
|Method: Yaesu FT-450D modified to accept an external reference. The external reference is a Leo Bodnar GPSDO. I used another Leo Bodnar GPSDO to calibrate the FT-450D, since the Yaesu DSP adds a variable frequency offset that I could not reverse engineer. Audio capture and tuning indicator from Fldigi. Frequency analysis in Matlab.|
Soapbox: My second FMT. It is a fun technical challenge. Thanks to all involved in setting this up.
|Method: Icom IC-7200, dipole, WSJT-X|
Soapbox: W9RKO was pretty weak on 30m here. Thanks!
|Method: WSJT-X with 756PRO2. Nothing else! I let the radio sit on for 6 hours and then did a calibration run with WWV/CHU frequencies 30 minutes before the FMT. Then I do a TRIMMEAN on the numbers throwing out the top and bottom 10%-20%.|
Soapbox: Thanks Connie! Once again I had a blast. When you started your run and a fraction of a second later disappeared I freaked out, but then I heard you a little while later and got the run. I couldn't hear a peep out of W9RKO on 30m.
|Method: ICOM IC-7300, WSJTX Waterfall|
Soapbox: This is my first FMT activity.
|Method: SDRPlay RSP1a w/Leo Bodnar GPSDO weakly coupled into antenna port. GPSDO freq. set within 200 Hz of test signal. Demod output recorded w/Audacity, played back into Visual Analyzer for FFT analysis. Used 1048576 point FFT to determine freq. difference between GPSDO output & test signal, yielding the test signal freq.|
Soapbox: Interference from digital mode stations made 80 meter measurement difficult. 30 meter TX problem @ K5CM was unexpected but kept Audacity recording through it all, allowing routine measurement.
|Method: E-probe > TS850 (CW-narrow, external clock) > soundcard > software to measure audio frequency. Everything is recorded then analyzed next day when I am more awake. Reporting Connie's second 30M keydn, short first seemed to be about 1 Hz lower.|
Soapbox: Thanks to ARRL, Connie, Michael. No copy of W8RKO 30M (skip zone), all other sigs excellent.
|Method: Icom 7610 and Spectrum Lab|
Soapbox: W8RKO in the noise on 30m, and 30 overS9 on 80m. Lots of local static and QRM on 80m.
|Method: GPSDO reference for signal generator with output offset by about 500 Hz from target signal, all received in AM mode and audio beat note measured using SpectrumLab analyzer after calibrating the sound card. Old method, but works with minimal sources of error.|
Soapbox: Well, the ionosphere got me this time as my QTH was in the skip zone from W8RKO on 30 m band at that time. Couldn't hear him at all. Lots of fun! Many thanks for these interesting and challenging tests, Connie and all others involved.
|Method: Same as last Nov., used the new FMT mode in FLdigi. TS-870 with Bodnar GPSDO as int. ref. and a Marconi 2018A Sig, Gen, stabilized by a GPSDO for the Ref.|
Soapbox: Good signals on all bands from Connie, Mike's 30 m was quite weak. Various SSB and digital QRM to make things interesting. My Doppler guestimations ended up just being confusing. so I left them out. Thanks Connie and Mike.
|Method: EMU-0204 soundcard. RS-HFIQ SDR. Spectrum lab. LO calibrated against Trimble Thunderbolt day of test. Offsets computed from WWw10, WWV5, and CHU3.|
Soapbox: Measured the later K5CM 30m signal. Had some noise and QRM issues on other bands. Some of my LO notes are scrambled from tuning around for the signals on 40, so hopefully I don't have any multi-KHz errors! Thanks to both stations for running the FMT.
|Method: ICOM 7100 CW/R-CW MODES TO MEASURE NEAR 600 HZ. AUDIO CW OFFSET OUTPUT WITH AUDIO GENERATOR/FREQUENCY COUNTER/SCOPE|
Soapbox: VERY NOISY CONDITIONS ON ALL BANDS EXCEPT 80 METERS. BOTH K5CM AND W8RKO HAD S9 + 10-20 DB SIGNALS ON 80 METERS. ESPECIALLY POOR CONDITIONS ON 30 METERS. I LOST K5CM COMPLETELY ON KEY DOWN ON 30 METERS AND W8RKO WAS IN THE NOISE SO HIS FREQUENCY WAS MOSTLY A GUESS. THANKS TO W8RKO AND K5CM FOR THE EFFORTS IN RUNNING THE FMT.
|Method: RF-590 RX and external soundcard. All oscillators locked to GPS-derived 10 MHz reference. SpectrumLab SW.|
Soapbox: W8RKO was barely out of the noise on 30M. All other signal levels were FB!
|Method: Elecraft K3 w/TCXO option; 30 Ft. vertical w/ATU; Spectran audio analysis software. Prior to test, established freq error correction factor against WWV (5, 10, 15MHz) where Spectran measured the same 600Hz sidetone while toggling between CW and CW-R. During test, recorded K3 frequency where I measured the same 600Hz sidetone in Spectran (as with WWV) while alternating between CW and CW-R modes. Applied correction factor to recorded frequency for submission.|
Soapbox: Both K5CM and W8RKO had strong 80M and 40M signals. On 30M, K5CM was fair but couldn't hear W8RKO at all. I thought I might have heard him (very weak) after the test period at around 10102880. Fun as always.
|Method: IC-7610 (GPSDO Ref.) into Spec Lab|
Soapbox: K5CM 30M signal was S9+10db (until it wasn't!); no signal heard from W8RKO on 30M (not even a whif!) On 40M K5CM was S9+10 and W8RKO was S9+5. On 80M K5CM was S9 (heavy QSB) and W8RKO was S9+15. Multi path and doppler effects were about average (seen worse and seen better!)
|Method: IC-7610, Speclab, GPSDO|
Soapbox: 30 Mtr signal from K5CM went off air. 30 Mtr W8RKO 339 with heavy QRM.
40 and 80 Mtr from both stations 459 with QRM.
|Method: GPS phase-locked reference injected into receiver input. Frequency delta measured with Spectrum Lab software.|
Soapbox: Thanks to K5CM and W8RKO for the test. Rather weak signal from W8RKO on 30 meters.....no problem with the other transmissions, excepting the doppler.
|Method: lucent gpsdo flex 6600 spectrum lab software|
|Method: GPS: Lucent/Symmetricom Z3810AS |
RECEIVER: GPS Locked RACAL 6790/GM
Tunable in steps of 1000Hz, 30Hz or 1 Hz.
SYNTHESIZER: GPS Locked HP 3336B
ZERO BEAT INDICATOR: Tektronix 2213A
ANTENNAS: GAP Voyager, GAP Titan DX, NVIS Dipoles 40, 80 & 160m
This is a modified . LEGACY ZERO BEAT METHOD…
CONFIGURATION: The post-filtered 455 KHz IF from the RACAL is fed to CH A of the Tek. A precise 455,000.000Hz carrier from the HP3336B is fed to the EXT input channel of the Tek. The scope is then set to display 2 cycles of the 455KHz IF waveform, instead of the traditional Lissajous pattern.
PROCEDURE: Frequency readings to 1Hz resolution are quickly made by tuning the RACAL to near zero beat with the aid of the Tek scope. If a signal is “dead on” a Hz point, such as WWV, and there is no Doppler, the waveform will not “slip” in either direction but will just vary in amplitude with changes in signal strength, and the "exact" frequency will be the Racal frequency readout.
If a signal is not "dead on" a 1Hz point, and the waveform is "slipping" L TO R, then the RACAL is tuned BELOW exact zero beat. If a signal is not "dead on" a 1Hz point, and the waveform is "slipping" R TO L, then the RACAL is tuned ABOVE exact zero beat.
If “stepping” the receiver 1Hz causes the direction of "slip" to reverse, the exact frequency is BETWEEN the current and former readout, i.e. between two concurrent 1Hz points. Also, estimates closer than 0.5Hz, of the actual frequency, can be made by comparing the "speed" of the ABOVE and BELOW "slip." The slower "slip" is less than 0.5Hz from that 1Hz point.
For more accurate “in-between-Hz” measurements, the RACAL is tuned ABOVE the unknown frequency and the HP3336B is then tuned upward, in 0.001Hz steps, from 455,000.000Hz until the R TO L waveform "slip" stops. The milliHz DELTA is then SUBTRACTED from the RACAL readout to give the “exact” frequency.
Using the regular scope waveform allows very quick “zeroing” of signals, even those that are nearly in the noise. I find it much easier to use than the traditional Lissajous pattern. It is also very interesting to note the rate of “slip” that occurs during Doppler shift.
Soapbox: 30m rough Doppler K5CM -100dBm W8RKO -80dBm; 40m K5CM -60dBm W8RKO -70dBm; 80m K5CM -50dBm W8RKO -55dBm. 40m 80m Minimal Doppler. No QRM on test frequencies all bands. RX noise floor -120dBm. TNX to Connie and Mike for generating the unknowns! 73 Don W4WJ
|Method: Standard K3 (USB) with Spectrum Lab Audio software.|
Soapbox: Great FMT, the first test on 10mhz made things interesting, Glad K5CM stuck with it. Good signals on all three bands, 10mhz test S2, 40 over K5CM on 40Meters.
|Method: Flex3000 & Fldigi|
Soapbox: Thanks everyone !
|Method: Hammarlund SP600-JX17 + 4 synthesizers + thunderbolt + dual-trace scope|
Soapbox: Thanks again. QRM on K5CM/80, lots of Doppler on all
|Method: HP 3586B locked to GPS reference|
Soapbox: On 30 meters K%CM was weak while W8RKO was stronger at S3
On 40 meters K5CM and W8RKO were both S9 and of course with Doppler shift.
On 80 meters K5CM was S8 but right in the middle of some sort of strong digital signal that I have never heard before. W8RKO was S9 and the digital signal was gone.
|Method: TS-690S and fldigi "calibrated" using a QCX+ with GPS|
Soapbox: First time doing the FMT. Mouse batteries died on first run.
Doing a homebrew calibration using a QCX+ to remove the error in
the TS-690S frequency and that of fldigi.
Stressful but fun. Practice for next time.
|Method: I used the fldigi FMT Modem with a GPSDO driven Siuglent 2042X for my reference frequency. Receiver was a K3 with GPSDO 10 MHz input. The FMT modem takes out my K3 "frequency locked loop" cycling.|
Soapbox: Thanks K5CN and W8RKO for providing the test signals. 30m was easy to copy and clear of other signals. On 80m the K5CM was underneath what looked like a digital traffic signal but fldigi seemed to track fine. On 40m had to move my reference signal as there was a Pactor signal. Fun test. Lots of short and long term Doppler. Did not try to guess how much. I'm guessing based on ppFMT tests I am 0.05 Hz low on 30 and 0.22 Hz low on 40. No clue on 80m.
|Method: GPSDO Flex-1500, PowerSDR, WSJT-X|
Soapbox: 1st FMT. Hopefully I did the math right.
|Method: HP 3586B Selective Level Meter, HP 3326A Synthesizer, GPS disciplined oscillator.|
Soapbox: On 30m, K5CM's signaled disappeared 2 seconds into key down. W8RKO not heard. Signal strength on 40m and 80m all strong with minimal atmospheric noise or QRM.
|Method: IC-756PRO-III tuned 1 KHz below the unknown signal in USB mode. Compared the 1 KHz tone to a 1 KHz tone generated by my PC using the Goldwave app. It was easy to hear the zero-beat when the tones matched. Just read the dial of the PRO-III and added 1 KHz. Did this several times and averaged the results. The PRO-III calibration was verified to WWV and CHU before the FMT started.|
Soapbox: The ground wave 30m signal from W8RKO was VERY weak - I'm about 50 miles away. All other signals were very strong. Had lots of QRN on 80m due to nearby lightning. Thanks to everyone involved in these FMTs - lots of fun! 73
|Method: ICOM IC-7610, GPSDO Leo Bodnar, fldigi ver220.127.116.11|
Soapbox: This was a great night for our club. We had three first year students up here throughout the night- the shack hasn't been this lively in some time. Excellent discussions of precision, accuracy, AM modulation, and who could get the best standard deviation amongst ourselves. We has some issues with fldigi early on, but persevered and overall had a great night.
|Method: Yaesu FT991A and WSJT-X. Monitored closest WWV or CHU signals to FMT frequency just before and just after test for calibration|
Soapbox: Copied K5CM solid on 30 M but did not get enough of the key-down to measure. NO W8RKO on 30 M. Neither K5CM or W8RKO on 40 M. No K5CM on 80 M. Solid W8RKO. First time participant. Enjoyed the experience. Wouldn't be surprised to find major error in measurement due to proceedure.
|Method: FT-1000MP with REF UNIT replaced by Bodnar Mini Precision GPS Reference Clock for receiver. Measurement and analysis by Fldigi 18.104.22.168.|
Soapbox: At 0130, the path MUF from here was 6 MHz to W8RKO and 7 MHz to K5CM, so hearing them on 30 m was pure fantasy. Their signals were good on the other bands.
|Method: This was my first attempt at FMT. My equipment was:|
IC-7300, Leo Bodnar GPSDO, ZFSCJ-2-1-S+ Splitter/Combiner, Step Attenuator, 40 meter EFHW antenna, FLDIGI.
|Method: FlexRadio 6500 locked to Trimble GPSDO, audio recorded on Denon digital recorder. HP3325A also locked to GPSDO drives Denon recorder second channel with 2 kHz reference tone to calibrate Denon's sampling rate. Homebrew GNU Octave code measures frequency which is averaged and weighted as a function of received signal strength.|
Soapbox: Good signals from both stations on all bands even though FMT was during daylight hours here on the west coast. Unfortunately there was a strong and fairly wide digital mode interfering station on top of K5CM on 80 meters but very sharp numerical filtering in GNU octave pulled the K5CM signal out of the digital crud. W8RKO's 80M frequency was away from the digital interferer. Thanks to both for their efforts.
|Method: FLEX-6700 & FLDIGI FREQ ANALYSIS|
Soapbox: Signals were good. S/N ranged 20 to 60 DB. K5CM strongest at my QTH.
|Method: The usual heterodyne method with GPS locked signal generator injecting known signal to create beat note which is measured with Spectrum Lab. Have been experimenting with tuning indicators in the audio chain to speed up getting the beat note on frequency. Using an old scope to create a Lissajous figure and also an HP 53310A modulation domain analyzer in fast histogram mode.|
Soapbox: A lot of fun as usual. Unfortunately couldn't get a reading on W8RKO on 30m since I'm in the skip zone. Other signals were strong. Thanks Connie and Mike and the crew.
Soapbox: Murphy's law ruled.
|Method: Kenwood TS-570S cw filters,OCF dipole 45ft high|
Soapbox: 73 Thanks Connie rough copy
|Method: 80 M dipole and HP SLM,|
Soapbox: I should have set up equipment sooner. An awful lot of static crashes tonight. Thanks to all who made this possible. Did not hear W8RKO on 30 Meters.
|Method: QRP Labs direct conversion receiver with quadrature sampling detector and polyphase network. Leo Bodnar GPSDO, set for 27.00 MHz output as master oscillator for rcvr. DIY audio filter, 7th order elliptical low pass with 1000 Hz corner freq.|
Spectrum Lab to display and save spectrum images. WSJT-X to calculate and log FMT data. Scilab and Excel to plot and process results.
Verified receiver calibration with WWV, CHU, other reference stations.
Soapbox: I could not hear K5CM on 30m. Otherwise, received signal strengths were adequate.
I observed some Doppler / multipath effects on 40m and 80m. Used magic wand to separate 'good' data from 'bad' data.
Great fun as always. Thanks to Connie, Mike, and ARRL for making this event possible. I would enjoy having FMT events four times per year.
|Method: Ten-Tec Omni VII|
Checked and calibrated with WSJT-X
Read audio tones with WSPR and adjusted accordingly
Soapbox: Nothing heard from K5CM on 80M.
Thanks to all.
|Method: Receiver: Icom R-8600|
Antenna: SteppIR DB-36 w/80 option at 70 ft
GPSDO: Jackson Labs Fury
Software: Fldigi 4.1.08
Used GPSDO as external frequency reference for R-8600.
Averaged Fldigi measurements during key-down period.
Soapbox: K5CM 30m signal was barely copyable. W8RKO's was 5-10 db louder.
K5CM 40m signal was S9+20, while W8RKO was S9+10
K5CM 80m signal was in the middle of a loud/wide digital signal, while W8RKO was in the clear and S9+25
Heard later K5CM 30m signal, but wasn't sure what it was, so only used first several seconds of 0133Z signal for measurement.
Also measured WWV 10 MHz signal before K5CM 30m run and after W8RKO. Two measurements were within 0.02 Hz of each other and about 0.14 Hz low, but didn't try to correct 30m FMT using this data.
|Method: GPS disciplined 10 MHz fed to HP signal generator then compared using Spectran to received frequencies of test signals and coorelated end frequencies|
Soapbox: Signals both strong and clear in Utah. All except last W8RKO 80 meter (full horizontal loop) using Butternut vertical. W8RKO had a brief QRM from a CW station during key down. Noted K5CM late on first 30 meter test. Hope my math is right!
|Method: HP 3586C Selective Level meter Locked to 10 MHz.GPSDO|
Soapbox: This is my first attempt at the FMT. No copy on W8RKO 30m
|Method: FT991A with wsjtx using the Frequency cal mode to measure the offset from the dial setting. I verified calibration by checking WWV at 2.5, 5.0 and 10.0 as well as CHU at 3.330 and 7.850. All were within a few tenths of a Hz.|
Soapbox: Noticed that K5CM seemed to have a problem with the key-down following his 30M callup. I only got half a second of the carrier, then it went away and finally at 01:36 he came back with the carrier.
|Method: Kenwood TS-480HX calibrated with WSJT-X "freqcal" offset.|
Soapbox: Interesting that immediately after t 60 second steady carrier on 40 meters from K5CM, several other very loud CW/steady carrier signals suddenly appeared on both sides of the FMT frequency. Coincidence?
|Method: Receiver: Flex Radio Systems, FLEX-1500|
Software: PowerSDR v2.7.2
Antenna system: 135' lazy-'L' sloper with 9:1 balun and MFJ-901B tuner
Method: Receiver allowed to warm for at least 30 minutes; receiver calibrated to WWV 25MHz; 'panascope' feature enabled; mode set to 'DSB'; band pass filter ('BPF') set to ±30 Hz; panascope sweep time set to 10 seconds.
Flex-1500/PowerSDR frequency display allows resolution to 1 Hz. After closest tuning, panascope will show number of cycles offset over a 10 second period. Tuning up 1 Hz and down 1 Hz will show which direction the offset lies from the closest tuning point. Divide the offset cycles by 10 for tenths of a Hz offset.
Soapbox: This is my first involvement with the ARRL FMT. It took some time to discover the capabilities of the Flex receiver and software. Development of a consistent measurement technique was the next step. After that, I began to feel ready enough to participate.
|Method: dipole, Flex 6400, WSJT-X freq cal mode, GDO reference. HP3336B synthesizer for calibration|
Soapbox: Good strong signals here but there was heavy QRM on 80M. The first part of the 30M run from K5CM was not heard except for the last 10S or so. It was as if he forgot to turn on the transmitter after the call up. What happened? The call up was a good strong signal and then nothing.
|Method: Frequency reference was the OCXO in my FTDX-5000. Used a Rubidium frequency standard to correct tuning and sound card errors. fldigi was used for data collection.|
Soapbox: This was my first FMT. I learned a lot and am ready for the next one.
|Method: Flex 6600 with Bodnar GPSDO and Spectrum Lab software with a button assigned to a "peak_rf" function to display the tone freq, which was added to the Flex dial freq. to come up with the semi final number. Allowed for some doppler by checking WWV/CHU to get a final freq to submit. Added some "best guess" in with the doppler!|
|Method: Inject a reference frequency signal into the antenna feed line. Measure the audio frequency difference between the unknown and the reference frequencies with DL4YHF's Spectrum Lab software.|
Soapbox: Thank you K5CM and W8RKO. K5CM signals into SE Michigan were excellent. W8RKO's 30M signal was in the noise most of the time, but 40M and 80M signals were ok.