|Method: HP Z3805A 10MHz GPSDO, Marconi 2019 HF synth, HP 3325A LF synth, HP 54601A o'scope, FT-847 in AM/narrow mode, 5BTV and 80M/40M dipole antennas, Vista laptop running SpecLab, DigiPan for spotting, EZGPIB controlling Prologix USB-GPIB to set up and interrogate instruments, GPSCon for monitoring Z3805A; the 2019 was set to inject a reference
beat signal to produce a ~400Hz beat tone, and the 3325A was tuned for minimum phase slip between it and the beat tone. Each run was recorded to a .wav file through SpecLab, and at a later time replayed to export data to spreadsheet to refine submission numbers. This time I also ran Fldigi concurrently in analysis mode for additional spreadsheet data.|
Soapbox: 40M/80M good copy, 160M weak but readable. Thanks Connie for running the test.
|Method: I used Open HPSDR (Mercury), Flex-Radio's PowerSDR, Trimble Thunderbolt GPSDO, and Spectrum Lab. I offset the HPSDR frequency about 500 Hz to make a tone with the HPSDR BFO, used PowerSDR to make a wave file. I played the file back in PowerSDR and ran Spectrum Lab, noting the offset from the HPSDR frequency. I used a TAPR TADD-2 connected to the GPSDO and receiver as a marker generator to check for DDS tuning word and sound card errors. Antenna: ground-mounted vertical 10 meters high.|
Soapbox: EN82sx Signal levels in dBm, all measured on the same vertical antenna: 40 meter -20 Noise Floor -70, 80 meter -20 Noise Floor -60, 160 meter -40 Noise Floor -70.
|Method: W5GI dipole to IC-7000; SignaLink interface to laptop running Spectrum Lab. After key down period, switched radio input to HP 3335A frequency synthesizer output (through 100 dB of attenuation). Thunderbolt GPSDO 10 MHz was fed into external ref. input of 3335A. Tuned synthesizer to match appearance of key-down signal on Spectrum Lab waterfall.|
Soapbox: Good signals on 40m & 80m, but very disappointing that no signal was seen/heard on 160m. Setup can easily detect a -135 dBm signal at the radio input, but nothing was seen on the Spectrum Lab waterfall when listening on 160m for the FMT signal. May have to consider putting up a 'real' 160m antenna.
|Method: FlexRadio 6700 with GPSDO and FLDigi on FMT frequency with one panadapter while using Spectrum Lab on WWV frequencies of 5 MHz and
2.5 MHz to estimate the Doppler shift.|
Soapbox: My first FMT. Could not hear 160 meter transmission at all. This is great fun.
|Method: HP3586 referenced to Trimble Thunderbolt. Sampled 15,625 Hz IF with SpectrumLab and to calculate the offset from the dial frequency.|
Soapbox: Good signals on all bands, after finding the 160m signal dodging the JT65 action. Very interesting frequency spreading observed on 80m, with several distinct frequencies seen. Which, if any, are right is the big question. My GPSDO lost sync and went into holdover about 2 hours before the test. I did a quick check against CHU and didn't seem to bee off by much, if any.
|Method: Flex 6700 with FLDigi in frequency analysis mode.|
|Method: Icom 706MKII|
Soapbox: Could not hear 160, could not hear 80
|Method: HPSDR Mercury phase display. Freq std: OCXO calibrated to WWV & CHU.|
Soapbox: 40m signals about 10dB above the noise with QSB. 80 & 160m were 30+dB above the noise. Thanks Connie.
|Method: FT-950, Spectrum Lab, with ref/correction factor determined from WWV, CHU, and even using local AM broadcast station carrier (for ref check 160M).
Seems like I reinvent my FMT methodology on the back of junk mail envelopes a day before each event HI.|
Soapbox: GUD sigmals at my QTH (no excuse there). Thanks to K5CM and all who work with dedication putting on ARRL FMT events.
73, George AG2M
|Method: Transceiver out audio to PC with FFT processor|
Soapbox: Lots of fun. 2nd attempt, but still needs refinement. Thanks, 73
|Method: Soft Rock Ensemble II SDR using a random length receiving wire antenna.
Measurement made on the spectrum analyzer on the display of HDSDR software.|
Soapbox: Thanks for the chance to see how my little Softrock receiver stacks up !
|Method: Elecraft K3, fldigi, vertical antenna calibrated to WWV.|
|Method: 10 MHz rubidium oscillator driving HP 3325A function generator and HP 5335A counter. Kenwood TS2000 in narrow AM mode, 40M/80M wire dipole.|
Soapbox: Excellent 40M signal, good 80M signal, weak 160M signal which faded down almost to background noise level.
|Method: Tuned a local oscillator to W1AW/5 frequency by ear and measured with a Heath counter IM-4100 that was clocked with an HP-10544A OCXC tuned to WWV earlier in the day at noon local time. The 40 and 80 receiver was an Atlas 210X and the 160 receiver was a Hallicrafters R-274D/FRR also known as SX-73, old and very heavy.|
Soapbox: The 40 Meter signal was less than S1 down in the noise in Northeast Kansas, hardly readable with some QSB. I could not get my local oscillator level low enought for an easy measurement by ear. However, both signals on 80 and 160 Meters were better than 60 dB over S-9, very strong, with little doppler. 160 had slow QSB, a bit more than 80. I want to thank Connie, K5CM, for transmitting this FMT and everyone that supported this fun exercise.
|Method: Heterodyne with HFO referenced to GPS, analyze beat with SpectrumLab.|
|Method: No in-shack frequency reference; calibrated TS-2000 by using over-the-air signals from WFAN, WCBS, WPHT, WWV, and CHU. Then used
FMT utility programs distributed with the WSPR package on the WSJT web site.|
Soapbox: Good signals on 40 and 80, but nothing audible on 160 m. Strong JT65 signals on the 160 m frequency did not help. (For what it's worth, I have included for 160 m the measured frequency of a weak carrier that was not audible but was found by the "fmtest" software.)
|Method: FT450D, K1JT WSPR fmt programs, computer|
Soapbox: 40M signal was S9 with occasional quick fade to S6.
80M signal was pretty steady S7-S8.
160M signal was not heard at all.
|Method: K3, HP8657B+Rb ref osc, vertical and horizontal antennas. CHU monitoring on 7.85 and 3.33 MHz using TS480 and Rigol DG1022A ref osc (locked to OCXO) on horizontal ant.|
Soapbox: Thanks test. Good signals all bands. Still doped up from heart operation. Results may be goofy.
|Method: Analog signal generator beat against TS 430S counted with HP5328A|
Soapbox: 40 M S3 with occasional QRM
80 M S3 - S9 no QRM
160 M S8 little to no QRM
|Method: Same Equipment as other entry just dropped the 10.000 and 15.000 references from calculations.|
Soapbox: Enjoyed the test - my 2nd one so far. Thanks to all the organizers.
|Method: A 0.1 Hz resolution synthesizer into BFO-enabled SW RX with variable attenuation, and post-FMT measurement correction with WWV comparison.|
Soapbox: The less favorable changes in location, signal levels, and respective interference levels from six months ago (in a NC corn field to suburban FL) definitely had an impact; next time will be better than this time! Many sincere thanks to all of those who make this possible.
|Method: Homebrew receiver with a rubidium reference into two PTS160 synthesizers. The first PTS if for local oscillator, the IF crystal filter is at 10MHz and the 10MHz reference provides BFO. The second PTS160 is set to 12MHz and is used to clock a USB audio adapter.
Used FFT to analyze audio and then calculated result. Hope my math is right. Hi Hi.|
Soapbox: Three of us participated in the measurement
Don Dobson KK4OGX
Bill Fuqua WA4LAV
Had a lot of Doppler shift on 40 and 80 meter bands so I expect substantial error there. I did average a set of FFT measurements to try to average out the error.
|Method: FlexRadio-7600 SDR|
Soapbox: 160m was a mess...
|Method: FT-1000MP xcvr making alternating comparisons between the "unknown" frequency and WWV as my frequency standard.|
Soapbox: Rapid flutter going into the noise level made the 40m measurement worthless (statistically unreliable at 10 hz). WWV (10 mhz) had begun fading with rapid flutter by the time of the 80m test. I switched to WWV at 5 mhz as a standard for the 160m run.
|Method: Receive system. Antennas:160m vertical (almost). 80 meter dipole slopping down from a 80' tower. 40 meter dipole between two 80' towers, 4 element SteppIR in bi-direction mode for 20 meters. For RX I use an FT-1000D in AM mode with a PTS-250 for low side injection. Audio is feed to SpectrumLab. Other RX antennas include three 500' Beverage|
Soapbox: Was fun to use W1AW/5 to transmit the FMT. Looking foward to another 100 years!!!
For transmitting the FMT I use an HP-Z3801 GPS frequency source which clocks a HP-3336b and a PTS-250. This feeds a 10 db transistor amp which drives a 12by7 / pair of 6146. The final amp runs about 400 watts. There are no mixers or any device in the chain of amplifiers that might impact the accuracy of the GPS frequency source. I verify the accuracy of the TX system with a second GPS reference
|Method: Argonaut V plus audio combiner and digital audio oscillator. Calibrated against WWV with same.|
Soapbox: Heard nothing identifiable on 160M -- missed 40M time.
|Method: Audio Beat Method, 2 receiver channels using H and V antennas.
Spectrum Lab text file output post processed with Excel. Used only data where H and V measurement the same to within a few mHz. Discarded the
rest of it. RF reference is LPRO Rb clocking my DDS synthesizer. Accuracy verified with T-bolt by phase comparison at 10 MHz.|
Soapbox: Nothing heard on 160 - probably due to operator error.
Thank again Connie. Onward to April!
-73 John K6iql
|Method: My receiver is a GPS referenced HP-3586B Selective Level Meter. I sample the 15625 kHz I.F. and fed that to the vertical input of an oscilloscope scope and the horizontal side was is fed from a GPS referenced HP3335A signal generator tuned to 15625 kHz. During the FMT I tuned the receiver in 1 Hz tuning steps to produce as close to a 1:1 Lissajous pattern as I could. Once I got to the nearest 1 Hz of the FMT signal I tuned the HP3335A generator to make the Lissajous pattern as stationary as propagation would allow. This allowed me to add the I.F. error to the tuned-to frequency of the receiver and calculate the actual carrier frequency. You can read specifics about my methodology at: http://www.k5cm.com/k6oqk%20fmt%20new.htm
Soapbox: Connie's 80 and 40-Meter signals appeared to be fairly stable, however, I could not hear his 160-Meter signal and I did tune down to the region where he was transmitting. My present aerial is a very low temporary dipole about 30' on a side. Thanks to Pam (N5KW), Connie's wife, for loaning Connie to us tonight. _Burt, K6OQK
|Method: IC7800 ref to GPSDO. CW pitch freq calibrated using GPSDO/Rb ref HP3325A driving radio.
Tune in FMT signal (on CW mode and measure tone frequency. SL measures entire run, but key down period weighted heavily.|
Soapbox: Arizona always in gray zone during FMT at 0300Z, making Doppler heavily predominant here. Variations in measurements from 100 mHz to 1 Hz peak to peak (band dependent). 160m signal -110 dBmV, hardly discernible.
|Method: FT-101EE receiver, HP 3325A synthesizer/function generator. Samsung SMT530NU Galaxy Tab 4 Tablet with audio spectrum analyzer by Keuwlsoft. Receiver in AM mode. Measured beat note with synthesizer set 1kHz above unknown.|
Soapbox: First time FMT, 40 meters - S8, 80 meters - S1, 160 meters - nothing heard.
|Method: GPS referenced comparison/beat frequency signal. With Spectrum Lab analysis.|
Soapbox: Thanks Connie. 160M & 80M signals were very good on a 40' Gap Voyager vertical. 40M signal strength seemed intermittent but still 100% copy.
|Method: Harris RF-590 into HP 3561A signal analyzer. The RF-590 was clocked with a frequency standard calibrated to WWVB.|
Soapbox: Thanks for this test. This was my first attempt at trying to measure frequencies using this method. The 40m and 80m were like practice runs. On 160m I had the method worked out and everything came together. I'll be looking forward to the next FMT.
|Method: Using Apache Labs ANAN-100D and WSPR FMT.|
Soapbox: A real learning experience. Hope to do this again and have better results. Thanks to Connie and all those responsible for this fun event
|Method: All homebrew equipment including a quadrature phasing direct conversion receiver, WWVB referenced frequency standard, frequency counter, and end-fed wire antenna. Method involved phase locking the receiver's LO to the frequency of the unknown carrier minus a 1 kHz offset. The carrier's frequency was determined by measuring the frequency of the receiver's LO over a 10 second integration period while factoring in the 1 kHz offset, and taking an average of all the readings taken. Full details are available at: http://www.qsl.net/kd2bd/fmt-methodology.html|
Soapbox: Connie's signals were very strong on 40 and 80, and strong and stable enough to acquire and maintain a solid carrier phase lock on 160 throughout the key down period. Many thanks to the ARRL and K5CM for the FMT!
|Method: All SDR method with 200 Msps direct sampling of RF:
Pixel RF Pro-1B active loop >> Clifton Labs Z10020 AM Notch Filter >> Ettus USRP X310 @ 200 Msps + LFRX + GPSDO (1E-11 AV) >> GNU Radio decimation to 2500 sps and filtering >> Baudline FFT|
Soapbox: Strong, steady signal on 80m with better than 40 dB SNR in 100 Hz BW. 160m was 30 dB SNR with fading down to 20 dB. 40m was 10 dB SNR with fades to 0 dB, and lots of QRM (there was a Canadian LSB net happening). Thanks for hosting this FMT.
|Method: yaesu rig + speclab, chu for reference.|
Soapbox: heard nothing on 160, 40 was weak, 80 came in great.
|Method: Icom 756proIII, Nexus 7 Spectrum Analyze app, antenna 20ft flag pole in front yard.|
Soapbox: My first FMT, 80M very strong, 40M good-QRM from a VE on 7057LSB, 160M heavy QRM from a digital signal, I think that I measured a carrier of another station that was tuning up. Found out afterwards that the Nexus 7 was not counting to the nearest .01 Hz like I had assumed. I will be using something different next time.
|Method: I Calibrated my TS-950 with an accurate service monitor. I tuned the known frequency from the svc monitor in the CW mode, then measured the CW tone with an accurate frequency counter. Then I measured the tone frequency during the test with the counter and determined the difference with the known tone and the test tone frequency.|
Soapbox: I had no propagation on 160 meters at all. I could hear the test on 40 meters but it was too noisy to accurately drive the counter. I had a way to do that with a weak signal, but could not get it set up in time.
|Method: No 40M signal, 80M signal fair, S-meter -110dBm, 160M signal good, S-meter -102dBm. Antenna off-center-feed 100 feet dipole. Receiver WinRadio G313. Used CHU and WWV for receiver calibration, also a two hour warm up.|
|Method: Audio Beat Frequency out of Yaesu FT-847 in AM mode measured by Spectrum Lab on a Dell laptop. HP 8640B signal generator locked to Z3801 GPS standard and attached to antenna with a step attenuator. HP312 frequency selective voltmeter used to spot and monitor.|
Soapbox: Signals strong on all bands with 160m a bit noisy. same set up as last year, however, lack of practice time may have caused major errors. Lots of fun. Thanks for FMT!
|Method: WSPR FMT tools.
wire dipole at 30 feet tuned for 20m.|
Soapbox: Barely could hear the signal on 40m. Couldn't hear anything on 80m, but the k1jt FMT tools managed to dig something out of the noise.
Determined frequency by visually centering slice receiver on carrier.
Checked display accuracy against WWV 10Mhz prior to FMT and found no manual adjustment to measured frequency would be necessary.|
|Method: Homebrew GPSDO to generate accurate 10 MHz clock for Calibration, ICOM R75 receiver to generate baseband audio, and Spectrum Lab to record baseband frequency peaks, and using 6m-80m OCF Dipole. Record peaks for both 10 MHz Receiver Calibration before and after each Frequency Measurement, and for each Frequency of interest. Since R75 has a frequency error which is a linear function of the tuned frequency, the error can be computed for any tuned frequency. Receiver tuning error is computed, subtracted from the measurement, and the result is the true frequency measurement.|
Soapbox: Although my antenna doesn't cover 160m, I thought I would get something on 160m, but I could detect nothing. I was wondering prior to the test, since so many like myself are space limited, and/or in antenna restricted communities, whether many would be able to get a good signal on 160m.
|Method: Dipole or Loop antenna into Flex-1500 clocked by GPSDO. CW mode, fixed AGC, 600 Hz tone sent to Spectrum Lab via Vitural Audio Cable. Manually picked consistent waterfall peak after allowing for Doppler shift.|
Soapbox: Strong signals on 40 and 80 meters. Whopper of a Doppler(?)signal on 80m. 160 meter signal weak and hard to find, only 4dB over my -120 dBm noise floor.
|Method: Flex 5000A on USB and fldigi|
Soapbox: messed up on 40m, used wrong sideband so had more calculations
|Method: Spec Lab. 7850 for calibration.|
Soapbox: 160m signal strong on my vertical. Not much doppler.
|Method: Flex-3000 and Ham Radio Deluxe software, tuned 1kc low in USB mode and measured audio freq. in DM780. Calibrated and tested with WWV and CHU.|
Soapbox: Had a lot of fun, good excuse to play radio. Did not hear anything on 160M but digital modes.
|Method: Elecraft K3, 40m dipole, WWV, DL4YHF's Spectrum Lab, calibrated ear.|
Soapbox: Fun test this go-around. Signals a bit weak and noisy with a lot of QSB on 40 meters. 80 meters much better with steady S9+20 signal. 160 meters better than 40 meters at this central Texas QTH bit not as strong due to mismatch of my 40m dipole. Can't wait until next time.
|Method: Yaesu FT-847
HP Pavilion PC with Soundscope SW
Measured freq using CW mode on Yaesu FT-847. Used PC to determine when CW note was eactly 1000 Hz, and then used dial reading of Yaesu as measured frequency. Dial reading of Yaesu was modified slightly by a calibration factor determined by measuring WWWV's frequency.|
Soapbox: Had a lot of fun. The last time I entered an FMT was in 2002, and I was within 0.2 Hz that time.
|Method: Method: 110 Foot long
home-made 14 gauge THHN wire
off-center fed dipole 20 feet high.
Ladderline to antenna tuner. HP
3586C selective level meter used
as a receiver. Lucent RFTG-m-RB
rubidium frequency standard 10
Mhz output connected to HP
3586C external frequency
reference input. HP 3586C
tracking output frequency sent
through an attenuator to tee
with antenna input into HP
3586C RF input. Audio output of
HP to laptop sound card using
Spectrum Lab software to find
unknown signal and adjust HP
3586C frequency to match.
Direct readout of HP corrected
with offset from Spectrum Lab
software for results.|
Soapbox: Very good signal on 40 meters.
Lots of doppler shifting on 80
meters. Couldn't receive 160
meters with my antenna. Same
hardware used as in 2010--the
only other time I tried this
|Method: Icom 706MK2g|
|Method: Well calibrated K3, Spectran, dipole, WWV|
Soapbox: 40M and 80M were good. 160M was a bit noisy and not real strong.
As usual, many tnx to Connie and all the others that made for a
|Method: Kenwood TS570 with SpecLab and program I wrote to compute frequencies.|
Soapbox: Good signals on 40 and 80 but very poor on 160. I couldn't hear the cw call up on 160 and made a SWAG (scientific wag) on a signal I found in the waterfall. At least it was in the band. Doppler on reference calibration frequencies (7850 and 3330).
|Method: Yaesu FT-3000, Digipan v2.0, Dipoles.|
Soapbox: 40 meter sigs nearly unreadable. Thanks to K5CM.
|Method: ICOM 746 PRO. Listening for zero-beat points on LSB with 3 KHz filter, interpolating between.|
Soapbox: Was fun. Lot of QRM on 40M, and weak signal at my QTH. Good sigs on 80 and 160. Hope I got in the ball park this year!!!
|Method: Agilent 33522A Function Generator locked to PRS10 Rb reference oscillator injects RF sinewave over air to RX in AM mode to produce an AF heterodyne against signal of interest. Measured the frequency of the resulting audio beat note with FLDigi to nearest 0.1 Hz using its Frequency Analysis mode tracking filter. Accuracy depends only on the Rb oscillator and the A/D clock in the Icom 7600 receiver, more or less independent of the tuning of the RX with 10 kHz AM filter.|
Soapbox: Booming S7 signal on 40m. Weaker, but still decent signal on 80m and 160m, but with lots of QRN on my end. QTH is 0.5 miles from AM B'cast station, the most powerful in the valley, and overload IMD obliterates all my receivers except for the trusty Icom 7600. My SDR's are all overloaded on those low bands, but I did use a Funcube Dongle for the 40m run, and recorded the RF session with HDSDR.
Antenna was a Pixel Tech magnetic-loop antenna on a 6 ft mast in the back yard, and it worked like a champ for me on all bands.
Pretty neat that I discovered some PSK and Olivia activity down around 1842 kHz while waiting for the FMT run there. Here I thought 160m was a dead band.
|Method: I used a FE-5680A Rubidium freq std feeding a Moto R2600B service monitor to calibrate my Kwd TS-2000, controlled by Ham Radio Deluxe. Antenna used is a 50' inverted V dipole at 30'.|
Soapbox: My 1st time at FMT. Signal on 160 and 40 not usable here in NE Arizona. 80m signal was +10. Interesting to find out my results. Ready to fine tune system and try again next time.
|Method: IC-746PRO with TCXO warmed up for a week. Spectrum Lab V2.74 software.|
Soapbox: Good reception on all bands. Little QSB.
|Method: Flex 5000A receiver in AM mode with an uncalibrated signal generator with correction factors calculated from WWV and CHU. Mixing at the antenna. Compared frequency with a scope to a good audio offset frequency.|
Soapbox: Conditions were very poor on 40M this evening. Fortunately noise in the neighborhood dropped a bit right before the test. Thanks to all who made this possible.
|Method: KX3 used to detect signal in CW mode.
Two thunderbolt referenced DDS signals injected into receive path about 100 Hz below and above the KX3 dial frequency. DDS frequency is set by Visual C program that reads the KX3 dial and sets each DDS.
Audio frequencies measured with Spectrum Lab running on two computers with different setting. Results are combined based on measurement StdDev to give result. Used TCP/IP to control Spectrum Lab on the second computer. Spectrum Lab is a wonderful program.|
Soapbox: Received all signals: 40M @ S7, 80M @ S8, 160M @ S4. My K3 is out for tune up. Modified setup and software to use KX3. Thanks for the test! I have a lot of fun preparing and measuring.
|Method: Antenna 120ft meander wire 8-15ft above ground, Flex 1500 AM Receiver, Stanford Research Systems DS345 BFO and SpectrumLab.|
Soapbox: Noise levels were very high. 160m signal was at the noise and about 3 Hz wide wirh QSB, that entry is a guess at the middle of the noise. Other signals were 6 to 10 dB above the noise with mild QSB.
|Method: Flex 1500 locket to GPS, Spectran for data acquisition.
Using CHU for Doppler measurements adding or subtracting (Doppler plus soundcard errors) to determine frequency of on air signal.|
Soapbox: Clear ID and clear tone on 40m, I can’t say the same for 80m.
|Method: dipole(40M), E-probe (80M,160M) to TS850 (CW-500Hz), FFT audio. No "correction" for Doppler so WYSIWYG|
Soapbox: Tnx to K5CM for FB sigs all bands
|Method: icom ic-7200 with flgigi program, set to lsb and adjusted to produce 1khz tone. subtracted 1khz from displayed dial frequency.|
|Method: FT950 with careful calibration of frequency errors monitoring WWV and CHU, feeding Spectrum Lab which was also carefully calibrated. Rig and computer warmed up all day.|
Soapbox: That was fun and I hope I'm somewhere in the ballpark. Signals on 80m and 40m were very strong, with 160m much lower, had to take the attenuator out.
|Method: Rcvr in AM mode and measured beat frequency between unknown signal and synthesized signal generator which was referenced to 10 MHz from an old HP Z3801A GPS rcvr.|
Soapbox: It was hard to decide which "lump" of data to use for the measurements on 40 m; probably they were both wrong, thanks to the dreaded Doctor Doppler. Signals on 80 and 160 m seemed well-behaved, although 160 m was weak in my local noise level.
|Method: TS-870S with standard oscillator.
SpectrumLab using CHU for calibrations.
Marconi 2018 Sig Gen for reference.|
Soapbox: 1st try with many "gotchas". I had grief with SpectrumLab - during the callup I had the spectrum width set to 10 Hz, then changed to 5 Hz at the beginning of key down and SL stopped displaying! The same thing happened for both 80 and 40 M, so I didn't get any data during key down. I realized (too late) that I should have had an audio oscillator at 800 Hz to a speaker so I could use beating to tune the FMT signal closer, allowing me to leave the spectrum width at 5 Hz.
Obviously I have a lot to learn about SL!
Thanks for the experience!!!
|Method: Acoustical zero beat with 1000Hz mp3 tone and +1kHz carrier offset on IC-718 rig; rig calibrated against WWV @ 5MHz, 10MHz using same method.|
Soapbox: Good signals at 80m and 40m. Signal at 160m not heard reliably, other than what seemed to be an occasional carrier, and some interfering stations. Attempted FMT on intermittent carrier heard at 160m.
|Method: TS-450S transceiver using 600 Hz. CW offset and measuring the near 600 Hz. output frequencies for Normal and Reverse CW with a frequency counter to obtain the "carrier" frequency.|
Soapbox: Thanks for your efforts, Connie. Good conditions on all bands except for rapid fading on 160.
|Method: TS-2000 + Thunderbolt GPS driven countdown + Joe Taylor's WSPR FMT software.|
Soapbox: 80m and 40m moderately strong and clear. 160m a different story. Signal weak plus QRM.
|Method: Essentially W4AVO's method. Using K3/TCXO and Spectrum Lab on laptop computer. Antenna: 40M vertical; 80M and 160M used 80M dipole.|
Soapbox: Lots of QRM on 160M but signal was Q5 here. Some QSB on 80M. Enjoy this challenge; thanks for the opportunity to participate. Kevin/W3DAD
|Method: Elecraft K3; 31 ft. vertical; Windows PC built-in soundcard; Spectran audio software. Verified K3 calibration to WWV at 2.5, 5, 10, and 15 MHz prior to test. Measured 600 Hz WWV tone through soundcard with Spectran. During test, zero beat K3 to each test frequency by adjusting for same 600Hz sidetone in both CW Norm(Rev) mode positions. Recorded K3 display frequency.|
Soapbox: Solid signals in Bowie, MD on all three bands. Lots of fun.
|Method: wire antennas feeding IC-7800 (locked to GPSDO) into SpectrumLab|
Soapbox: Signals on all frequencies were good readable. QRM a bit more noticeable than usual. Multipath and doppler shift noticeable even on 160M! Tnx fer the transmissions Connie!
|Method: Kenwood TS-590S with TCXO and the FMT software from K1JT|
|Method: IC-756p3 using 2 point calibration (60kHz 10MHz) and SpecLab V2.79b09.|
Soapbox: Lessons learned: 1. FE-5680a Rb freq stds that won't lock still have use as coffee cup warmers. 2. Squirrels find gpsdxo antenna coax tasty. 3. Spreadsheets prevent careless mistakes only if you avoid careless spreadsheet setup mistakes.
|Method: Kenwood TS-480HX w/ TCXO, Griffin iMic, fmt software by K1JT calibrated against WWV, CHU.|
Soapbox: 160 m signal weak but measurable here.
|Method: GPS disciplined Icom 756Pro, navigator interface and FLDIGI|
Soapbox: Mr. Doppler played havoc this evening, No propagation on 160 hr in SC.
Values are the best I could average chasing them back and forth. No green line this time.
|Method: While my Racal 6790GM is down for repair I used my HP 3336B to ZERO BEAT
the unknown in the K3 passband.|
Soapbox: TNX to Connie K5CM, for hosting W1AW/5 for this FMT!!
|Method: Trimble Thunderbolt & Lady Heather for reference.
Flex 6500 -> Spectrumlab -> Add & subtract etc.|
Soapbox: I never found/heard 160. Probably made a mess of the 80 reading.
Fingers crossed for the 40 !?!
|Method: 80m FTDX5K CW SPECTRAN
40m Flex6700 AM HP3325A Z3816A Spectrum Lab|
Soapbox: 160m signal not identified as cw or carrier just looked like noise
Enjoyed it. Would like a certificate.
|Method: Flexradio 3000, LSB mode. Placed Roland VT-12 vocal tuner near speaker, adjusted receive frequency until I was generating a 440 Hertz tone (A above middle C). Subtract 440 Hz from dial frequency.|
Soapbox: Thanks for a fun event !
|Method: I used a Flex 6500 with Fldigi. I checked against the nearest CHU or WWV signal prior to receiving the unknown frequency to determine corrections.|
Soapbox: This was a nice test. Thank you Connie for running a good FMT. Keep up the good work!
|Method: Thunderbolt, heterodyne sig down to 455 kHz, compare on dual-trace scope with local 455.|
Soapbox: 160 not heard, but there was a carrier at 1840003.22 (broadcast station harmonic?)
|Method: Flex 5000, HP 3336B, GPS locked. Using Delta Reference method plus other windage.|
Soapbox: Signals fairly good on all bands this time. Lots of JT65 on nominal 160m frequency but Connie found a clear spot. Thanks to all for the fun and w1aw/5
|Method: HP Z3801 GPS disciplined oscillator, HP 3586 Selective Level Meter to directly read the transmitted frequency.|
Soapbox: W1AW/7 had strong signals on 80 and 40 meters in Southern California. 160 meter signal was weak but measureable.
|Method: I modified my ICOM 756 - to disable the internal reference oscillator and input an external reference signal GPS locked to 30MHz signal. When the external signal is attached it disables the 756 internal oscillator. The 30MHz signal comes from HP 8656B Signal Generator that has an external 10MHz time base provided by a Shera GPS locked 10Mhz (HP10811) Frequency Standard. All of this provides an accurate GPS locked 30 Mhz signal for the reference oscillator in the IOM 756.
Spectrum Lab is used to read out the frequency along with the 1Hz readout on the 756
Antennas are a dipoles for 40 and one for 80, both about 50 feet up.|
Soapbox: Absolutely NO SIGNAL on 160 meters in Oregon.
The signals on 40 and 80 were solid S9. The frequencies were badly smeared by multipath on 40 to about 1 Hz on Spectrum Lab and not as bad on 80, about .6hz. Hard to figure where center was. A lot of guessing. I checked WWV before and after each measurement on 10MHz, 5mhz and 2.5 Mhz and they were real stable tonight.
I Had Fun Jimmy W7CQ
|Method: IC-718 w/ Indoor Wire Antenna. Calculate rcvr's error with WWV, and use that to correct FMT measurements.|
Soapbox: 40M and 80M signals were very week. Nothing heard on 160M. I just have to get a better antenna! Fun as always. Thanks to K5CM.
|Method: Icom IC-706 with 30 MHz phase lock to Shera GPS standard. Spectrum Lab for audio DFT.|
Soapbox: Always fun and challenging. I was unable to find any trace of a signal to measure on 160-m.
|Method: Elecraft K3 calibrated vs. 10 MHz WWV. Measurement by injecting sidetone monitor via "spot" and zero-beating.|
|Method: SDR1000 copy in phase mode|
Soapbox: 40M weak, 80 strong, 160 good enough & tnx for extra time
|Method: WJ-8718 Receiver locked to Rb standard, beat note measured with DL4YHF's Spectrum Lab software.|
Soapbox: Good signals 40m and 80m. 160m weak but readable by ear. Extreme Doppler on 40m. Thanks to Connie, K5CM and thanks to ARRL for sponsoring.
|Method: TCXO IN KENWOOD TS-570S|
|Method: HP 3586B, Trimble Thunderbolt GPS, HP 3336A generator, HP 5335A Frequency counter, 2 channel scope and Spec Lab for visual display. 40 M dipole antenna.|
Soapbox: Great fun. Thanks for the FMT Connie. Nice signal on 40 & 80M. Not heard on 160.
|Method: Trimble Thunderbolt; HP 8656b signal generator; Elecraft KX3 with TXCO; fldigi.|
Soapbox: Rushed home from work 1m before! Couldn't hear anything on 160m.
|Method: Yaesu FT-1000MP Mark V Field, (unmodified), Heathkit IG-5218 Audio Oscillator. Tuning accomplished with two channel oscilloscope. Frequency is read directly from unmodified FT-1000 display.
Measurements are made in real-time. Results posted: 13 Nov 2014 03:38UTC|
Soapbox: In January 2013, FMT Group Member, Connie Marshall, (K5CM) proposed a "radio only" FMT exercise. Connie's edited post is shown here.
Participants may use only a Radio Receiver or Transceiver. This means any external GPS or WWVB receiver can not be used as a reference for the Radio. NO external counters or computers. NO HP SLM's or other "non Ham radios" . Calibration from WWV or CHU is OK. Wall clocks with seconds hands are OK. Mechanical devices such as tuning forks are OK as long as they are not electrically driven.
Connie Marshall, Jan 6, 2013
As far as I can tell no one, in the FMT group, has picked up Connie's challenge. The radio only methodology is not a trivial task and has been on my mind since Connie made the post. My current complement of radio hardware includes: Icom 706 MkIIG, Kenwood TS-570, and Yaesu FT-1000 MkV Field. Initially I was deterred by the fact that all three of these radios displayed frequency with a 10Hz minimum resolution. The "official ARRL" posted rules allow for a 10Hz margin of error. A participant can guess at the frequency and come in with a sub 10Hz error. My "radio only" solution would have to be within 0.5Hz resolution. While Connie's post was titled "Radio Only FMT" closer inspection of the post reveals serious additional restrictive requirements. If taken at face value many would be deterred by the requirements. I decided to take a stab at the challenge and deal with meeting the totality of the requirements at a later stage. For the moment I believe my implementation of "radio only" meets the spirit of the goal, meeting the letter of the challenge will have to come later. Ed WA6RZW, Elizabeth, CO
|Method: Using disciplined signal generator for BFO, tuned beat note to sync with 1000Hz reference on scope.|
Soapbox: 40 meter signal had plenty of Doppler, 80 was more stable. Couldn't hear him on 160 at all. I was almost exactly 166.667 Hz off on last April's FMT, let's see if I've learned anything since then!
|Method: I used my Flex Radio 5000A along with a HP 3336B signal generator both were locked to a GPS reference. Due to poor signals(poor antenna actually) I resorted to a simple zero beat method with the Flex in the AM mode and tuned the HP to zero beat using the Panascope display in the Flex. The scope display will show zero beat to less than 1 cycle/hertz depending on the signal quality. I was unable to detect a signal on 160 meters.
I was hoping to use my active loop but was unable to complete the antenna prior to the event.|
|Method: FUNcube Dongle Pro+ with SDR#|
|Method: Yaesu FT-857D with XRef-FT board locked to a Trimble Thunderbolt GPS. A separate TBolt controlling an Agilent 33120A with opt. 001 to check the Yaesu dial readings. SpectrumLab collecting data and analyzing one long duration data set on each band. Indoor noisy dipole for 40m. Outdoor Pixel Loop (AM-2) for 80m and 160m.|
Soapbox: Having a great time, and trying a simplified approach this time -- good or bad, we'll see! Thanks much for hosting the FMT. Enjoying the prep, the test, and the analysis.
|Method: HP3586B, HP3335A, locked to Thunderbolt. Rcvr output recorded and analyzed on Spectrum Lab. 80m dipole and miniwhip.|
Soapbox: Fun, thanks to all who make it possible. -Bill, WB0LXZ, EM27pj.
|Method: KX3, WWVH calibration, fldigi beat freq display|
Soapbox: Enjoyed the chance, thanks much.
|Method: ICOM 7200 USB; HP Computer with Windows 8.1 Pro; Spectrum Lab
software; Adjust radio frequency to even kHz for signal in reasonable
location on Spectrum Lab scale 500-1500 Hz. Recorded time and
frequency multiple times and then averaged. Before and after FMT
checked error of system against WWV on 10 & 5 MHz and compensated
measured frequency for WWV error indicated.|
Soapbox: I enjoyed learning new software (Spectrum Lab) and trying out my capabilities. Thank you for the opportunity to test my equipment.
|Method: AM detector process and Spectrum Labs|
Soapbox: 40 & 80 meters had reasonable propagation. However, 160 meters was absent at my location.
|Method: K3 with external 10MHz reference using GPS disciplined oscillator
HP3320B synthesizer 10mHz resolution
Matched CW audio with synthesizer|
|Method: Yaesu FT-1000MP, CW mode, spot switch on and tuning slowly. Then checked against HP 5334A counter to add a couple digits.|
Soapbox: Hard to believe I do this well using a transceiver built in 1996 and without the high stability oscillator. This is a lot of fun! Not heard on 160m.
|Method: DVB-T+DAB+FM & HDSDR calibrated to WWV.|
|Method: Anan 100d / fldigi|
|Method: TAPR HPSDR with GPS disciplined standard used for reference|
Soapbox: signal not heard on 160 Meter band near advertised frequency. A lot of JT65 type signals on advertised frequency.
First time attempt. I hope I'm close enough for a certificate.
|Method: FT dx5000 Rec w with USB CW SPECTRAN Computer Audio|
Soapbox: Unable to hear 160M Signal
80 and 40M signals quite strong
Would like a Certificate.
|Method: Flex5000a using a rubidium reference. Fldigi version 3.22.01. used in frequency analysis mode.|
Soapbox: My first FMT since April of 2012. Excellent conditions for the November FMT.
|Method: Kenwood TS-2000 connected to computer sound card, using Spectrum Lab software.|
Soapbox: First FMT attempt, with a crude set up. Rig tunes in 10 Hz steps. Mentally averaged received peak frequencies shown on Spectrum Lab display and jotted notes. Added or subtracted that from rig's displayed frequency minus known offset error. Hopefully I'm in the ball park. Needed more time and patience to study Spectrum Lab software. Made no attempt at Doppler shift corrections. Guess I'll see in the results if I'm on the right track, or need to start over from scratch.