November 3, 2017
Actual Radio Frequencies (Hz):
|RF Low Freq||AF Freq Dif|
80m/40m RF All (<=1 Hz), 80m/40m AF Dif All (<=0.1 Hz):
AA6LK, AB2UW, AE7MY, AE8TF, AF9A, K1GGI, K3JQ, K3KO, K3OK, KA5QEP, KA7OEI, KD5MMM, KF7NP, KG6KGP, KI5EE, KO0Y, KS1H, VE2IQ, VE3OAT, VE3YX, VE7CNF, W1KU, W2KKJ, W2TX, W3DAD, W3JW, W7LUX, W7PUA, W8XN, W9GR, W9INE, WA1ABI, WA5FRF, WA9VNJ, WD4IYE
80m RF (<=1 Hz):
AA6LK, AB2UW, AE7MY, AE8TF, AF9A, AH6EZ, AJ4YA, K0WM, K1GGI, K2LYV, K3JQ, K3KO, K3OK, K3TCT, K4IVF, K5RKS, K6APW, K6UM, K7HIL, KA5QEP, KA7OEI, KD5FX, KD5MMM, KF7NP, KG5X, KG6KGP, KI4NVX, KI5EE, KK4KAZ, KM6QX, KO0Y, KS1H, N1IRO, N3CRT, N4VSD, N5DM, N5LUL, N7EP, N9CIF, NU0C, VE2IQ, VE3OAT, VE3YX, VE6GRT, VE7CNF, W0HBK, W1KU, W2FD, W2KKJ, W2TX, W3DAD, W3FAY, W3JW, W4WJ, W6BM, W7CQ, W7LUX, W7MRF, W7PUA, W8XN, W9GR, W9INE, W9ZB, WA1ABI, WA1SXK, WA2DVU, WA4FJC, WA5FRF, WA6RZW, WA7BNM, WA7IRW, WA9VNJ, WB0OEW, WB2CMF, WB6HYD, WD4IYE, WX4TW
80m RF (>1 to <=5 Hz):
KD2BD, N0MFD, VE9DAN, WB0VGI
80m RF (>5 to <=10 Hz):
80m RF (>10 Hz):
K0TNT, KG0HY, N5KAE, N8OOU, W5TV, W7GW
80m AF Dif (<=0.1 Hz):
AA6LK, AB2UW, AE7MY, AE8TF, AF9A, AJ4YA, K1GGI, K3JQ, K3KO, K3OK, K3TCT, K4IVF, K6UM, KA5QEP, KA7OEI, KD5FX, KD5MMM, KF7NP, KG6KGP, KI4NVX, KI5EE, KO0Y, KS1H, N3CRT, N8OOU, N9CIF, NU0C, VE2IQ, VE3OAT, VE3YX, VE6GRT, VE7CNF, VE9DAN, W1KU, W2KKJ, W2TX, W3DAD, W3JW, W4WJ, W7KPZ, W7LUX, W7MRF, W7PUA, W8XN, W9GR, W9INE, W9ZB, WA1ABI, WA2DVU, WA5FRF, WA7BNM, WA9VNJ, WB0OEW, WB0VGI, WD4IYE, WX4TW
80m AF Dif (>0.1 to <=0.5 Hz):
AH6EZ, K0WM, K5RKS, K7HIL, KK4KAZ, KM6QX, N1IRO, N4VSD, N5DM, N5LUL, W0HBK, W2FD, W3FAY, W5TV, W6BM, W7CQ, WA6RZW, WA7IRW, WB2CMF, WB6HYD
80m AF Dif (>0.5 to <=1.0 Hz):
K6APW, N7EP, W7GW
80m AF Dif (>1.0 Hz):
K0TNT, K2LYV, KD2BD, KG5X, N0MFD, N5KAE, WA1SXK, WA4FJC
40m RF (<=1 Hz):
AA6LK, AB2UW, AE7MY, AE8TF, AF9A, AH6EZ, AJ4YA, K0WM, K1GGI, K2LYV, K3JQ, K3KO, K3OK, K5RKS, K6APW, K6UM, K7HIL, K8YUM, KA5QEP, KA7OEI, KD2BD, KD5FX, KD5MMM, KF7NP, KG5X, KG6KGP, KI5EE, KK4KAZ, KM6QX, KO0Y, KS1H, N1IRO, N3CRT, N5DM, SV8QG, VE2IQ, VE3OAT, VE3YX, VE6GRT, VE7CNF, W0HBK, W1KU, W2FD, W2KKJ, W2TX, W3DAD, W3FAY, W3JW, W4WJ, W5TV, W6BM, W6DSR, W7CQ, W7LUX, W7MRF, W7PUA, W8XN, W9GR, W9INE, WA1ABI, WA1SXK, WA2DVU, WA4FJC, WA5FRF, WA6RZW, WA7BNM, WA9VNJ, WB2CMF, WD4IYE, WX4TW
40m RF (>1 to <=5 Hz):
KI4NVX, N0MFD, N4VSD, N5LUL, N7EP, VE9DAN, W7GW, W9ZB, WA7IRW, WB0VGI
40m RF (>5 to <=10 Hz):
40m RF (>10 Hz):
K0TNT, K3TCT, KG0HY, N5KAE, WB6HYD
40m AF Dif (<=0.1 Hz):
AA6LK, AB2UW, AE7MY, AE8TF, AF9A, K0WM, K1GGI, K2LYV, K3JQ, K3KO, K3OK, K5RKS, K8YUM, KA5QEP, KA7OEI, KD5MMM, KF7NP, KG6KGP, KI5EE, KK4KAZ, KM6QX, KO0Y, KS1H, N5DM, N7EP, VE2IQ, VE3OAT, VE3YX, VE7CNF, W1KU, W2KKJ, W2TX, W3DAD, W3FAY, W3JW, W5TV, W6BM, W6DSR, W7CQ, W7LUX, W7PUA, W8XN, W9GR, W9INE, WA1ABI, WA1SXK, WA5FRF, WA6RZW, WA9VNJ, WB0VGI, WD4IYE
40m AF Dif (>0.1 to <=0.5 Hz):
K6APW, K6UM, K7HIL, KD5FX, KI4NVX, SV8QG, VE9DAN, W2FD, W4WJ, W7KPZ, W7MRF, WA2DVU, WA4FJC, WB2CMF, WX4TW
40m AF Dif (>0.5 to <=1.0 Hz):
40m AF Dif (>1.0 Hz):
AH6EZ, AJ4YA, K0TNT, K3TCT, KD2BD, KG5X, N0MFD, N1IRO, N3CRT, N4VSD, N5KAE, N5LUL, W0HBK, W7GW, W9ZB, WA7BNM
Result Details (n=91):
|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 controlling Prologix USB-GPIB and USB-serial 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. Each run was also recorded to a .wav file through SpecLab, and at a later time replayed to export data to spreadsheet to recover the "2nd" frequency and to refine submission numbers.|
Soapbox: Thanks Connie for another fine FMT. Strong signals and quiet bands this time, but still had more than 0.5 Hz smearing on both. WWV_5 and CHU_3.3/7.8 about the same, though WWV_2.5 had solid line. 73, L.
|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 referenced, HP 3335A frequency synthesizer to about the same frequency. After about 30s of key-down, switched the radio input to the synthesizer and adjusted the synthesizer to the 'same' frequency (used SL peak detect function). Moved radio & synthesizer 170 Hz up for the second tone and did the same thing. Read each frequency directly off the synthesizer; subtracted to get the shift. 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: All signals were clearly readable in FN30. Observed more doppler shift on the 80m signals.
|Method: GPS disciplined Rb oscillator driving sound card (1pps) and external PLL stabilizing IC746pro 32MHZ osc. spectrum lab to analyze audio.|
Soapbox: first time mistake, ignore if you can 80M entry as I transcribed numbers incorrectly.
|Method: ICOM IC-7300 using Spectrum Lab to record and analyze the output of the rig's USB Sound interface. Used reference measures of WWV at 2.5, 5 and 10 MHz before and after each run to attempt to correct for the rig's VFO errors.|
Soapbox: My first FMT. 40m signal was very clear, 80m had a lot of noise, including something that sounded like intentional jamming that started about 3 seconds in to the first tone and lasted for about 15 seconds.
|Method: Open HPSDR Mercury, WSJT-X FreqCal, calibrated against WWV, CHU.|
Soapbox: 40m signal about 10-15 dB above the noise. 80m 30+ db above the noise. Thanks Connie!
|Method: Flex 6700 with Spectrum Lab. Offset receiver by 1KHz and zoom into Spectrum Lab carrier peak. Averaged jitter.|
Soapbox: Needed to Practice Spectrum Lab navigation. Screwed up the second 40m carrier. Guessed at it for entry form success. :(
|Method: Elecraft K3s I used the results from April to estimate the difference in actual freq. and observed freq on the radio, plus estimated error on 40 meters using WWV at 7.850Mhz tone. Zero-beat the signals, added the corrections to get my SWAG. I need to credit my bride for her help with the zero-beat. Her hearing is much better than mine.|
Soapbox: I had a blast doing this, but I always do.
|Method: Flex 3000.|
Soapbox: Good copy, pretty rough measurements.
|Method: Equipment is a Yaesu FT-1000MP Mark V 60-Hz CW bandwidth, Rockwell/Collins 180S-1 tuner, 40-meter dipole, Fluke 8845A multimeter. Calibrate receiver on WWV 2.5, 5.0 and CHU 7.85 MHz. Apply analysis to remove obvious fades, use statistical process control to discard outliers, correct for receiver drift.|
Soapbox: Good signals on WWV 2.5, 5.0, CHU 7.85, plus 40 and 80 meters. WWV 2.5 was remarkably consistent this time. The highest frequency variation was on 80 meters. Thanks to Connie K5CM for his effort and continued support of this interesting event.
|Method: Heterodyne with LO locked to GPS, measure beat note with SpectrumLab|
Soapbox: Tnx for another fun one
|Method: WSPR frequuency measuring tools on Ubuntu|
Soapbox: Interesting variation on the traditional test.
|Method: HP 3586B Selective Level Meter referenced to Trimble Thunderbolt GPS Receiver. Audio output analyzed with Spectrum Lab running on Windows 7 Desktop. Antenna is Carolina Windom 80 Short, 60 ft up.
System calibration performed by using power splitter to feed GPSDO reference 10 MHz to 3586B input so as to determine center frequency audio output as measured by Spectrum Lab to be 1849.643 Hz.|
Soapbox: For this FMT, system was calibrated using 10 MHz GPSDO reference, rather than over the air WWV signals. I previously used the WWV transmissions on the assumption that this would give some information on Doppler shifts and other path differences, but after some discussion with K3KO (thanks, Brian), I concluded that it was better to use the absolute calibration provided by the GPSDO. Disclaimer: I nearly bungled the FMT when I made a received frequency adjustment of 3 kHz instead of the 3 Hz that I intended!
|Method: K3 + Spectrum Lab + Rb locked HP8657B Ref Osc. Measured pitch difference in CW mode between signal and Ref.Osc.|
Soapbox: Thanks Connie. Atmosphere not as stable as warmup session. This time 80M was the more unstable of the two. 40M signals 4 S units stronger than the warmup session. 80M 3 S units weaker than warmup session. Both signals >S7.
|Soapbox: Rig: Yaesu FT-955. Software: Spectrum Lab & Fldigi|
|Method: Kenwood TS-590SG, Spectrum Labs software and Hustler Vertical|
Soapbox: Really needed a bit more time between forty meter transmissions to adjust setup preparation to measure difference frequency for better accuracy
|Soapbox: Good signals on 40....I just got behind in what I intended to do and botched the measurement.|
|Method: Injected RF signal from HP3336B into antenna input of receiver along with FMT signal off the air. Receiver in USB mode. Measured audio tones coming out of receiver using homebrew FFT software. HP3336B used external 10Mhz GPS "Thunderbolt" reference.|
Soapbox: 40 meter sigmal was S5 with noise level about S4. 80 meter signal was 20dB over S9.
|Method: Receiver characterized to WWV and CHU, digital audio oscillator through hybrid combiner with receiver audio.|
Soapbox: Preparation for naught. Path instability, noise and short measurement times made it very tough. Differential frequency error less than a half-Hertz is serendipity.
|Method: Elecraft K3 with EXTREF option
HP 0960-0477 OCXO (Ovenaire)
Soapbox: The K3 with external reference is only good to +/- 0.5 Hz. Maybe time to move on to an SDR for the FMT.
|Method: Flex, recorded CW pitch then post test matched with house standard|
Soapbox: Messed up the RTTY measurement, esp on 40M. When I switched frequencies it killed Spec Lab and only got a couple of seconds data. Doppler +/- a Hz here in AZ on both bands.
|Method: SDR-14 from active loop antenna, recorded RF voltage waveform in IQ
format from early call-up through end. Analyzed results the next
morning with home brew SW. Ref was 10 MHz WWV recorded for about 1 minute immediately afterwards and given similar processing.|
Soapbox: Was getting too sleepy to try 80m- this was past my bedtime. I aspire to someday own a Rb- this was kind of fun.
|Method: Receiver Harris RF-590 with old crystal oscillator frequency standard. Data were recorded to wave files and processed with a program I wrote using Mathematica language.|
Soapbox: 40 meter data showed spectral peaks moving around. 80 meters was better. All in all, pretty good conditions.
|Method: Antenna: 200+ FT circumference lazy loop
RX: FT-817 with TCXO
Signal Gen: Schlumberger Stabilock 4031
Freq. ref: Z3801 GPSDO
Method: Receiver tuned 1 kHz below nominal, USB, with a reference carrier injected into receive path at 500 Hz above nominal. After FMT, signal reference retuned to nominal frequency.
Audio from FMT was recorded and played back using the embedded reference signals for differential measurement to determine absolute frequencies of both test carriers using Spectrum Lab with very narrow FFT. The use of different reference frequencies also provided a "sanity check" as well as redundancy to catch errors.
Previous to FMT, a precise 4 kHz tone was amplitude-modulated, received in AM on the FT-817 and used to calibrate the sample rate in Spectrum Lab.|
Soapbox: Good signals on both 80 and 40 meters. Approx. +/- 0.25 Doppler shift was noted on both 80 and 40 - slightly faster moving on 40.
|Method: All homebrew FMT equipment, so just hearing the transmission is considered a great accomplishment! Same carrier phase tracking methodology as used in previous years, except a voltage controlled dual DDS VFO was employed as the RCVR LO for the first time. The VFO's OLED display blanked out for unknown reasons (Murphy) each time a QSY was needed forcing a VFO "reboot", which left little time to make the follow-up measurement. As such, no green line this year as my delta readings are probably VERY wrong.|
Soapbox: The Kp-index rose to 4 during the FMT. Signals were very strong, BUT as luck would have it, some very deep fades occurred on 40 just as the keydown period began. There was also some digital QRM during the start of the 80 meter keydown. This was a great exercise, but may I suggest more A0 and less A1 in the future so that propagation effects can be examined more closely?
|Method: FLEX6300 and Spectrum Lab|
Soapbox: S8 here in Ponca City on 40 Mtrs and S9+30dB on 80 Mtrs!
|Method: ft847, signalink, speclab, excel|
Soapbox: hope to be close, Not Sure about <0.1hz !!! 73 all
|Method: The equipment here consists of an RSP2Pro SDR receiver and a homebrew GPSDO providing the 24 MHz clock input to the RSP2Pro. The PC is a Dell XPS-15 with an I7 6700HQ CPU which is heavily loaded with this configuration. The software is SDR Console using Virtual Audio Cable to supply audio from multiple receivers to multiple copies of WSJT-X. WSJT-X is running in FreqCal mode with a frequency tolerance of 20 Hz. SDR Console allows recording the actual RF samples to allow replaying the data later. This also allows me to sample from 2.3 MHz to 10.3 MHz and have multiple receivers configured. This allows you to have a receiver set for the 40 and 80 meter frequencies in addition to 2.5,5 and 10 MHz WWV.|
Soapbox: This was my first FMT and I still have a lot to learn. This includes trying to understand the effect of Doppler shift on the signals. I also need to make improvements to my GPSDO.
|Method: Powered-up 0100UTC, receiver is WinRadio G313, antenna is 100 feet dipole, used on 40M and 80M. Check calibration with CHU.|
Soapbox: 40M was fading into the noise. 80M signal was +20dB over. Casey KG0HY
|Method: SDRPlay RSP-2 calibrated with WWV|
|Method: HP 3586 with opt 01 tuned with a GPSDO but not using GPSDO as a reference. Wanted to see how close I could stabilize the OXCO in the 3586. Used a custom routine in spectrum lab to measure the 3586 audio output and gen a list of average peak freq readings. We'll see if this method is more accurate.|
Soapbox: I'm not wild about this test as the second measurement, the AF freq. difference, being only in the 170hz range relies almost entirely on the software's ability to do long FFTs. If the second frequency was outside the audio band width then it would be more challenging.
|Method: RSP2pro. Used FMT utilities included in WSPR/WSJTX8-beta.|
Soapbox: First timer. Tons of fun. Generally clear signals at my QTH. Signals rocked fairly steady between S6-S8 on both frequencies. Strong, strange,'hashy', interfering signal, approximately 2000 HZ wide,that lasted approx. 10 seconds just after the start of the 3MHZ 1st signal run. The FMT tools found the carrier just fine right through that garbage. Impressive.
|Method: I used a Kenwood TS-2000 working with a computer running Spectrum Lab.|
Soapbox: I charted my radio frequency error using WWV on several frequencies. This frequency error was then charted on Excel spread sheet to determine the error at the transmitted frequency. To keep the radio from drifting, I made sure that my radio room was cold and stable so that the internal radio fan would not cycle on and off causing the frequency error to change up and down.
|Soapbox: Frequency variations of over 1 Hz, on both bands, here in West Central Florida. May not make 1 Hz limit for Low Freq, but hoping that Freq Dif of SRSQs of each sample group will help zero in on < 0.1 Hz for Fdiff!|
|Method: Pixel loop into Flex-6700. CW mode 1,000Hz tone into Spectrum Lab set for 0.09 Hz bins. Picked most consistent peaks (not average) then calculated AF difference.|
Soapbox: Very strong K5CM and CHU signals on both bands with typical amount of Doppler for Bay Area just after sunset. During last week's drill, CHU 7850 had NO signal, and Doppler was very small.
|Method: Anan 200D with GPSDO, active vertical whip, Spectrum Lab. I averaged all readings, then removed those more than one standard deviation away from the mean (.22 Hz on 80, .27 Hz on 40). I rounded to hundredths.|
Soapbox: First time at this.
|Method: ICOM 746pro with spectrum lab software calibrating with chu and wwv|
|Method: Flex 3000, no other equipment, compared to WWV and CHU. Weak signal on 40M, 80 M was stronger.|
|Method: Kenwood TS-2000 with Ext 15.6 MHz Ref from Bodnar GPDSO, into SpectrumLab on computer soundcard.|
Soapbox: Was hard to get readings during the one minute carrier, but it was my first time ever so I will do better next time! Thanks for doing this!
|Method: Flex-3000, FLdigi, WWV before and after.|
Soapbox: I did not do as careful of an evaluation of WWV that I usually do. I just scribble things on paper. Thank you! Lots of fun. 73
|Method: Programmable Arduino GPS oscillator.
Spectrum View software
Soapbox: Too close for skip on 40 and the groundwave signal, though visible on the spectrum trace was too weak to measure with any accuracy.
|Method: FT-3K with Digipan V2.0. 80/40 Dipoles.|
Soapbox: South Texas...all signals S9+10 and QRN/QRM/QSB free.
|Method: Kenwood TS850. Measured high and low heterodynes within bandpass on LSB mode, divided by two, and took that as center transmitted frequency. Did this for each of the four measurements. Took difference between high and low freq. for each band.|
Soapbox: Interesting test. If I am anywhere close, I will be surprised, due to my crude methodology.
|Method: Yaesu FT920 zero beat to WWV.
reading 5000017 at 5000000 to form "fudge factor"
Zero beat 1st and 2nd test signals.
Submit 1st freq. and difference between 1st and 2nd.|
Soapbox: Signals were loud and clear on both bands. Thanks for putting this on again Connie! Brad- N5LUL
|Method: FLDIGI, IC-7000, WWV LOTS OF LUCK, GOOD AND BAD|
Soapbox: EXCELLENT SIGNALS INTO ARIZONA
|Method: Kenwood TS-480 radio and a computer to count cycles above 3.598Mhz.|
Soapbox: This is my first FMT event. I didn't understand how it worked so I had to use the 40m transmission to learn what I needed to do. I don't expect to be right, but I hope I am close.
|Method: Icom IC-7200 and K1JT's fmt program|
|Method: Delta=F method in an SSB receiver
Drake TR-7, Butternut HF-6V antenna
HP/Agilent E4420B generator locked to Tracor 304SC Rubidium standard.
reference signal at 3597500.00.|
Soapbox: Good signals on 80M but not even a whisper in the wind on 40M this year. Thought my rig was broken!
|Method: Flex 1500 locked to TRIMBLE NTPX26AB GPS Timing Receiver, Spectran for data acquisition, using CHU for Doppler correction.|
Soapbox: 40M signal weak but clear, 80m unreadable. The error spread from Doppler for CHU @ 7850 KHz was .29 Hz and the Measurement uncertainty at 40m low frequency 0.35 Hz and 0.28 Hz, at the higher, so very difficult to be in the 100mHz target… my answer is more a guess work than extensive calculations.
|Method: Dipole > TS850 (ext ref) 500-Hz CW filter > record audio to disk. Analyze with FFT-based homebrew software. Use last few seconds of the low tone and first few seconds of high tone, hoping Doppler didn't change much over such a short time.|
Soapbox: Signals good both bands but heavy powerline QRM. Sounded terrible but spectrogram normal. Connie's strong signals got through the noise. Thanks to everyone who made this happen.
|Method: Receiver in AM mode with BFO injection from external oscillator referenced to a 10 MHz GPS-disciplined oscillator. Resulting audio tones measured using SpectrumLab software.|
Soapbox: Good signal levels received here, but Doppler struck again. Observed some peculiar trends in my once-per-second frequency measurements. Alas, one minute transmissions are too short to sort out these mysteries. It is certainly a good test of our equipment, method, and savvy. Many thanks to ARRL and K5CM for providing these tests.
|Method: TS-870 with GPSDO. Set the tone on Fldigi to 1 KHz to measure the lower freq., then adjust rig freq. to set the higher tone to 1 KHz to measure the higher freq. Separately, record the audio with an IC-R8500 and Audacity and later, use Fldigi to measure the freq. difference. The 2 methods yielded the same difference freq. to 2 decimal places.|
Soapbox: Thursday evening works better for me. I like the addition of the freq. difference. Thanks; Bob VE3YX
|Method: SDRplay RSP-2 reciever, SDRUNO software calibrated to WWV & CHU, audio fed through the sound card for frequency measurement using homebrew software.|
Soapbox: Great signals in Calgary, it is rare to hear 80m that well.
|Method: Used a Trimble 57963 GPS Disciplined 10 MHz reference with a Rigol DG1032Z function generator to give reference signals at 3598085 and 7064085 Hz, between the two unknown frequencies. Receiver is an IC-7410 in CW mode with 200 Hz bandwidth. Spectrum Lab on a laptop was used to measure audio peak frequencies for the low, reference, and high tones. FFT bin size was 0.061 Hz and about 15 measurements were averaged for each tone.|
Soapbox: Thanks for the challenge and I hope I got close. Signals peaked S7 on 40m and S8 on 80m, with noise around S2 and rapid QSB.
|Method: Yaesu FT-920 with TCXO. Direct frequency measurement.|
Soapbox: Thank you Connie for conducting the FMT again! 599+ on both bands in Cedar Rapids.
|Method: E-MU 0204 soundcard and RS-HFIQ SDR with Fox924 TCXO for LO. Spectrum lab. 192 KHz sampling rate decimated by 12, 262144 input FFT. Soundcard sampling calibrated and SDR calibrated with Trimble Thunderbolt GPSDO PPS and 10 MHz prior to test. Over-the-air offsets calculated from CHU3.3, WWV5, and CHU7.85 and interpolated linearly for 40m and 80m tests. I messed up 40m data acquisition, so my submission is an estimate from the live processing I was running during the test. 80m analysis done offline later.|
Soapbox: Prior participant who missed the last few tests. I'm interested to see how everyone does on the audio-frequency offset calculations. Thanks.
|Method: IC706 CW mode/narrow filter/1 Hz. dial resolution. Used near 600 Hz. receiver audio output compared to stable audio signal generator with Lissajous pattern and frequency counter to measure output frequency of the audio generator and the receiver. This near 600 Hz. audio was used to improve the resolution of the dial frequency to the nearest 0.1 Hz. Calibration used WWV 10 MHz. for test signal.|
Soapbox: Thanks for your efforts in providing another good FMT Test, Connie. Signals on both bands were very strong with only a slight problem with interference from another station.
|Method: Quadrature Phasing Narrowband Receiver designed by KD2BD. My first attempt at using it. Trimble GPS receiver, Heathkit IM-2420 interfaced with an RPi3 taking measurements every 10 seconds.|
Soapbox: Wow ... One minute is not much time to get a measurement. Received frequencies here bouncing around by about 100 mHz.
|Method: KWM-380() and sound card, both locked to GPSDO. Tune the receiver in USB, using 300 Hz BW filter, to match a 500 Hz tone. Read the audio frequency (nominal 500 Hz) from Spectrum Lab and add the two frequencies.|
Soapbox: Both signals were well above normal noise levels, but have had VERY high noise levels since the hurricane. I saw signal spread of up to 1 Hz wide in Spectrum Lab; don't know if this was due to propagation or to the local noise (poor signal-to-noise ratio).
|Method: OCXO+K3S/TXCO and Spectrum Lab. Using LSB mode measured beat frequency and using dial frequency, calculated actual RF frequency. Calculated shift by subtracting both RF frequency measurements.|
Soapbox: Signal on 80 meters was a bit weak here (MD) on the vertical GP, but usable. Good signal on 40M. No QRM this time. Thanks and 73.
|Method: Elecraft K3 w/TCXO option; 30 Ft. vertical; Spectran audio analysis software. Prior to test, calibrated K3 against WWV (5 & 10MHz). During test, recorded K3 frequency where 600Hz sidetone frequency measured the same in Spectran while alternating between CW and CW-R modes. Measured audio shift in Spectran at second frequency.|
Soapbox: Fun as always! Good signals on both bands. Stuck with just measuring the audio shift on the second frequencies as I couldn't adjust the VFO fast enough in fine tuning mode to get K3 on frequency within the two minutes. :)
|Method: Flex 6700 into SpectrumLab. Data collected using receiver BW of approximately 400Hz with post test analysis in narrow SL windows centered on respective test frequencies.|
Soapbox: All test signals were s9+, plenty of multipath as always on 80 and 40 M. Tnx to all who make these tests possible.
|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 & 80m
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 a 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”, 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. If the waveform is moving >>>, the RACAL is tuned BELOW exact zero beat. If the waveform is moving <<<, 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 right to left waveform movement stops. The milliHz DELTA is then SUBTRACTED from the RACAL readout to give the “exact” frequency.
The AF DELTA is simply the result of subtracting the lower frequency from the higher frequency.
Using a 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 Lissajous pattern. It is also very interesting to note the carrier frequency variances that occur during Doppler shift.|
Soapbox: 40m... -65dbm, slow doppler; 80m... -50dbm, erratic doppler
|Method: Flex 6500 with 10 MHz rubidium frequency standard
fldigi frequency analysis|
Soapbox: This was a different type of FMT. I enjoyed this and look forward to the next FMT
|Method: SP-600 with GPS-locked synthesizers for LO, BFO, SpectrumLab to measure audio note.|
Soapbox: Thanks for the rehearsal. Lots of Doppler: signals strong but more than 0.5 Hz wide.
|Method: Coherent receiver to counter both locked to GPS disciplined 10 MHz reference. Counter readout at 10 Hz by PC with Excel to do linear fit to data.|
Soapbox: Background noise on 40 was -121 dBm into 200 Hz bandwidth, signal was -97 dBm, so nice strong carrier. Background noise on 80 was -118 dBm, signal was -117.5 dBm into 200 Hz bandwidth, so nothing to measure on 80 here in Sunnyvale, California.
|Method: ICOM 765 with 1 HZ readout and a 30 MHz IF Injection locked to Shera GPS 10MHz Frequency Standard, Spectrum Lab, 80 meter Dipole at 70 feet.|
Soapbox: Interesting Test. I would like to see longer times spent on each frequency. I think the time format was too short. Maybe a key time of 1 minute on lower, 2 minutes on shift and back low for 1 minute might help, or maybe 2 minutes on each frequency would allow to properly gather data. 40 meters was straight forward with clean signals but the signals on 80 were smeared over 1.1Hz on both signals. Just my thoughts, I still had fun, Jimmy W7CQ (Hope I didn't make any dumb math errors this time)
|Method: K3, GPSDO, W1PW correction factors|
|Method: IC-718 with CR-338 crystal. Indoor wire antenna. FLDIGI on Windows7 computer. Calibrated the rcvr with WWV before the test. Then averaged the freqs fldigi measured.|
Soapbox: 40M signal strong, but 80M signal was weak. I didn't do any statistics this time, just eye-balled the readings and guessed at the average. Next time I'll try to use my little SDR receiver.
|Method: K3, TADD-2, PRS-10, Fldigi, Old XP laptop. Tried correcting for Doppler by measuring 5 MHz WWV between FMT measurements.|
Soapbox: Thanks for hosting the FMT.
|Method: E4436B 10 MHz gps locked + spectrum lab.|
Soapbox: first trial on FMT very exciting
|Method: The receiver is an Icom 706MKII, Glenn Elmore modified with Shera-GPS lock. Spectrum Lab does the hard work, including CI-V control of the receiver and wave file recording and playback.|
Soapbox: I was not going to be home for the test, so I used Conditional actions in Spec Lab to make seven different WAV files of WWV and the FMT signals from K5CM. This worked so well that I plan to use the method in the future, even when I am at home. The spectral spreading was an issue on both bands, and it was particularly bad on 80-m. Another minute at each frequency would have reduced the guessing, probably. It is always interesting. Thanks to K5CM for the strong signals.
|Method: RFSpace NetSDR+ locked to a Trimble Thunderbolt, Pixel magnetic loop antenna, analysis done in Octave.|
Soapbox: I haven't tried a FMT in a while, so my rustiness is likely to show. Both bands produced S9 signals, although a passing thunderstorm, rare this time of year, bumped up the noise level. Thanks for an interesting FMT, Connie, I had a great time.
|Method: FlexRadio 6500 locked to Trimble GPS. Stereo WAV file made on Denon SD card recorder with 2 kHz reference tone on second channel (to calibrate out Denon sampling rate error) from HP3325A also locked to GPS. I use my own GNU Octave code to filter and detect frequency from WAV file.|
Soapbox: Significant QSB on both bands with short fades to lower than -30 dB, but I weight frequency data as a function of received signal strength. Just for fun I hacked my GNU Octave code to squelch on Morse key-up, and made measurements of the CW call-up period. On 40 meters I got 7064003.91 Hz (-0.03 Hz from tone) and on 80 I got 3598003.24 Hz (+0.01 Hz from tone). Submitted data are from the continuous tone only. Thanks to K5CM for running the test.
|Method: FLEX 6700.|
Soapbox: 40 MTR Signal -88 dBm with no QRM, QRN, or QSB. 80 MTR signal -94 dBm with no QRM or QRN; some QSB.
|Method: Icom706MKIIG in 600 Hz CW mode, DDS 600Hz, DSO138 scope. Sum both 600 Hz into scope, count beat difference, divide by time for 60 beats, add to approximately 2Hz low offset.|
Soapbox: 40M signal again weak, but at least readable at about S-2 with QRN. 80M signal much better, and I cranked the receiver up about 170 Hz quickly to have enough time to get a reading on the 2nd frequency.
|Method: WJ-8718 receiver locked to Rb standard, BFO beat note measured with DL4YHF's Spectrum Lab software.|
Soapbox: Good signals on both bands in this fast-paced and challenging FMT. Thanks to K5CM for producing another great FMT, to ARRL for promoting, and to Bruce for entry processing.
|Method: Icom 7300 calibrated to WWV (+ -) .25Hz Then during FMT test record data using WSJT-X APP to record spectrum waterfall data into a .wav file, then take the data to analyze the frequency of each tone.|
Soapbox: My 1st time to enter the FMT contest. Enjoyed learning new uses of the WSJT-X APP, with the help from my friend and Elmer "Mike Black W9MDB". Thanks for all your help and 73s Mike, Eric WA1SXK
|Method: 3586, 3336,455 scope, 5316a counter, lucent gps.|
Soapbox: entered fx using 3586,3336,455 set up. Fed counter from earphone jack. 80 meter diff from jack = .09 hz 40 meter diff from jack = .157 hz 80 meter sig = clear fx very little doppler -66db 40 meter sig = digital qrm some doppler - -75 db
|Method: HP SLM, 40 M dipole, SpecLab & Thunderbolt GMS standard.|
Soapbox: Thanks for the FMT Connie
|Method: Icom R8600 receiver, Mac Book Pro and Dell Lattitude laptops. Record WWV at 5 MHz before and after test for calibration as well as FMT signals during test using a high resolution .wav recorder for post processing. Separately calculate FMT frequencies on each laptop and average results. Software programs were Cool Edit and Spectrum Lab.|
|Method: HP3586B as receiver, SR-620 Counter, Heathkit IG-5218 as IF2 reference, measured with Thaoxin F-2700L counter. All reference, IF, audio and antenna signals interconnected via Extron Crosspoint 84 and 88 video switchers. No computers or spreadsheets used. Arithmetic done on back of envelope.|
|Method: Rig: Elecraft K3/P3 Antenna: SteppIR DB-36 GPSDO: TrueTime XL-DC Ref Generator: HP-3336C Software: Spectrum Lab Vers. 2.92. For each band measured the two RF signals and then the reference signal for calibration.|
Soapbox: 40m signal was S9 to S9+30, 80m signal was S6-S8 (non resonant antenna). Messed up Spectrum Lab configuration for 40m+170 transmission, but didn't have time to fix it during short transmission time - just used nominal value.
|Method: KX3 receiver and Spectrum Labs FFT s/w. My comparison signal source is a QRP Labs VFO/SigGen kit with a 10 MHz Rb oscillator as the reference for the PLL. Measured difference between K5CM signals and local signal, so no need to calibrate RX and compensate for ppm error.|
Soapbox: I got the siggen kit with Rb ext. reference operational about 1 minute before the FMT began. No time to practice. Post FMT comparison with WWV looks like technique should be OK to less than 1 Hz. We'll see if I did something stupid like RX in LSB vs. USB like April FMT.
|Method: Trimble Thunderbolt-locked Yaesu FT-857D and Spectrum Lab doing FFTs, then averaged. Rigol DG1022Z waveform generator locked to a second TBolt to calibrate-out DDS error and sample rate error, after the test. Antenna is an RF-PRO-1B shielded magnetic loop, one-foot off the ground.|
Soapbox: Signals generally S7-9 but with QSB to S0 at times. Also used various methods to check results: shorter FFTs, mixing high/low WAV files to isolate the difference (shift) frequency using analytic signal techniques in Octave. And used a GPS-locked SDRplay RSP2 with a special synchronous AM technique.
|Method: CloudIQ SDR, SpectrumLab, home brew GPS reference|
Soapbox: 40 was wiped out here. Thanks for the test.
|Method: Rcvr Yeasu FT-897 display corrected by beat against WWV at 2.5, 5, 10 and 15 Mhz. Antenna G5RV and Long wire with FC-40 Tuner. Count using PC and Daqarta software.|
Soapbox: 10 db fading on both signals but strong and clear about 20% of the time. Took 1 second averages of count. Thanks.
|Method: Kenwood TS-2000, Cushcraft R8 Vertical for 40Meters, End Fed Dipole for 80 Meters, Compaq CQ-56 Laptop, Rigblaster PC Interface, Fldigi software in frequency analysis mode.|
Soapbox: Conditions were good on both bands. I was able to copy all well. A little QSB on 80 meters. Some digital interference on 80 meters during the test but did not last more than 10 seconds or so.
|Method: K3, vertical, scope, audio generator, frequency counter, spectrum lab|
Soapbox: I submitted the data obtained using the scope and sig gen. I got a second set of data directly from spectrum lab.
|Method: Fldigi connected to IC-718. Antenna is a 36ft end fed hanging vertically in a tree. I sometimes make dyslexic mistakes but hope to be under a 1 hz on frequency. I don't have the equipment to be under .1 hz on the shift.But hope to be the best of the worst :) Its always fun. All signals were very strong. Thanks again Connie!|
Soapbox: I don't have the equipment to be under .1 hz on the shift.But hope to be the best of the worst :) Its always fun. All signals were very strong. Thanks again Connie!
|Method: Icom 7300, Spectrum Lab Software|
Soapbox: Good signal on both frequencies. This is fun; thanks for doing it.