Results - November 13, 2020 FMT
|Actual Radio Frequencies (Hz):|
K5CM All (<=1.0 Hz):
AA6LK, AB2UW, AB4RS, AD5MT, AD7G, AD8Y, AF9A, AJ4YA, AJ6GZ, GW4BVE, K1JE, K4BSD, K4BYN, K4CXX, K5RKS, K6FOD, K6UM, K7NG, K8DJR, K8DJT, K8TK, K9JM, KA5QEP, KA8BRK, KD2BD, KE5O, KF7NP, KJ6HYC, KJ8S, KN1H, N0PFE, N3FG, N5DM, N6LKA, N6PE, N7EP, N8OBJ, N8TW, N9BPL, N9KT, NF7R, NJ0U, NN7OR, NO6B, NR5ON, VE2IQ, VE3OAT, VE3YX, VE6IXD, VE7CNF, W2EMN, W2FD, W2TX, W3JW, W4IVF, W4WJ, W5LAC, W6BM, W6OQI, W7CQ, W7LUX, W7PUA, W7SLS, W7SUA, W8DPK, W8EDU, W8WTS, W9FLA, W9GR, W9INE, W9TN, W9WLX, W9ZB, WA2DVU, WA5FRF, WA5UCW, WA7BNM, WA7IRW, WB6HYD, WB8REI, WB8TFV, WD4IYE, WQ8T, WS7M
K5CM 80 (<=1.0 Hz):
AA6LK, AB1UY, AB2UW, AB4RS, AD5MT, AD7G, AD8Y, AF9A, AJ4YA, AJ5P, AJ6GZ, GW4BVE, K0JFJ, K1JE, K4BSD, K4BYN, K4CXX, K5RKS, K5VPQ, K6FOD, K6UM, K7NG, K8DJR, K8DJT, K8TK, K9JM, KA5QEP, KA8BRK, KD2BD, KD5FX, KE5O, KF7NP, KG5X, KJ6HYC, KJ8S, KN1H, N0PFE, N1IRO, N3FG, N5DM, N6LKA, N6PE, N7EP, N7WS, N8OBJ, N8TW, N9BPL, N9KT, NF7R, NJ0U, NN7OR, NO6B, NR5ON, VE2IQ, VE3OAT, VE3YX, VE6IXD, VE7CNF, W2EMN, W2FD, W2TX, W3JW, W4IVF, W4WJ, W5LAC, W6BM, W6OQI, W7CQ, W7LUX, W7PUA, W7SLS, W7SUA, W8DPK, W8EDU, W8WTS, W9FLA, W9GR, W9INE, W9MDB, W9TN, W9WLX, W9ZB, WA2DVU, WA4FJC, WA5FRF, WA5UCW, WA7BNM, WA7DUH, WA7IRW, WA7X, WB6HYD, WB8REI, WB8TFV, WD4IYE, WQ8T, WS7M
K5CM 80 (>1 to <=5 Hz):
KD5MMM, KD8SMO, KE6ZLX, KE8KWZ, KI5EE, N5KAE, N5LUL, W1KU, W2AGC, W2NMI, W3BG, W7KPZ, WS3W
K5CM 80 (>5 to <=10 Hz):
K0VW, N5BA, N6JF, VE9DAN, W4HCR, W8AN
K5CM 40 (<=1.0 Hz):
AA6LK, AB2UW, AB4RS, AD5MT, AD7G, AD8Y, AF9A, AJ4YA, AJ6GZ, GW4BVE, K1JE, K3KSB, K4BSD, K4BYN, K4CXX, K5RKS, K6FOD, K6UM, K7NG, K8DJR, K8DJT, K8TK, K9JM, KA5QEP, KA8BRK, KD2BD, KD5MMM, KE5O, KE6ZLX, KF7NP, KJ6HYC, KJ8S, KN1H, N0PFE, N3FG, N5DM, N5KAE, N6LKA, N6PE, N7EP, N8OBJ, N8TW, N9BPL, N9KT, NF7R, NJ0U, NN7OR, NO6B, NR5ON, VE2IQ, VE3OAT, VE3YX, VE6IXD, VE7CNF, W1KU, W2EMN, W2FD, W2TX, W3JW, W4IVF, W4WJ, W5LAC, W6BM, W6OQI, W7CQ, W7LUX, W7PUA, W7SLS, W7SUA, W8DPK, W8EDU, W8WTS, W9FLA, W9GR, W9INE, W9TN, W9WLX, W9ZB, WA2DVU, WA5FRF, WA5UCW, WA7BNM, WA7IRW, WB6HYD, WB8REI, WB8TFV, WD4IYE, WQ8T, WS3W, WS7M
K5CM 40 (>1 to <=5 Hz):
K0VW, K0WM, KE0NRE, KE8KWZ, N6JF, VE9DAN, W2AGC, W2NMI, W3BG, W4HCR
K5CM 40 (>5 to <=10 Hz):
KD5FX, KG5X, KI5EE, N1IRO, W7KPZ, W8AN
Soapbox: Thanks again Connie for running the event.
|Method: Useing SDRPLAY RSP2 with SDRuno. tuned sdruno in AM mode.|
Soapbox: Forgot about FMT test until 15 minutes before test started. Did not have time to do any calibrations. 40 meter signal very weak.
|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: 80m signal stronger in FN30 at 0220Z. Thanks to K5CM for his FMT efforts.
|Method: Received using HP3586B locked to DPSDO reference. Sampled IF with computer soundcard using SpectrumLab. Use HP3336C locked to 10 MHz to generate reference signal to calibrate sound card offset.|
Soapbox: Fun as always, great signal on both bands into Northern Virginia. I should probably stay up for the second run to see if propagation/doppler changes affect things, but I hope to be sleeping by then.
|Method: Used a modified version of the "tuning fork" method on the site. Instead of fork, used audio oscillator set exactly to 440 hz using GPS clocked counter. Instead of ears used X-Y scope display. Receiver Kenwood TS450 with TCXO. Known error on dial is about +0.6hz at 7mhz and +0.2 hz at 3.5 mhz which was used to correct the 440 subtraction.|
Soapbox: Note quite a bit of skywave instability here on 80 meters. This is my second try. First time my method was use counter and was destroyed by noise and skywave. Hopefully we are close. Its either within 1 hz or totally messed up. TS450 note: although the display is only to 10 hz, you can read units out of the cat interface.
|Method: GPSDO into KWD TS-890, dipole antenna. Used WSJT to compare signals received to frequency displayed on the radio, then additional correction using WWV at 2.5,5,10 MHZ|
Soapbox: I could do this test 20 times and get slightly different results every time.
|Method: EQ USED FTDX3000 DDS WAVE SYN|
|Method: ICOM IC-7610, Bodnar mini, horizontal antenna, fldigi FMT modem. Sound card calibrated (to zero error) and WWV/CHU monitored beforehand to check on current errors.|
Soapbox: Was with W8EDU for early run, this is at home. I hope the WW0WWV crew all decided to give FMT a try! We talked about it at the evening Zoom meeting three hours before the early run. Thanks Connie and ARRL for running this show!
|Method: HPSDR Mercury recvr, OCXO calibrated to WWV/CHU, WSJT-X measurements.|
Soapbox: Good signals as always, S9+ both bands. Thanks Connie!
|Method: Elecraft K3s zero beat using the ‘spot’ function. Then adjust using historical error of this rigs tuner. A guess, in simple terms.|
Soapbox: Fun again
|Method: New rig this time IC-705, Fldigi, dipole|
Soapbox: Early run results. 40 meters was long and far too weak for a good reading. Wild guess 7064634.2, did not submit. 80 was strong.
|Method: IC-7300, WSJT-X, GPSDO/WWV reference|
|Method: TS590S with RFzero board running GPSDO code used as the reference oscillator. Audio measured with SpectrumLab running on PC. PC SR calibrated before tests using a 10MHz homebrew GPSDO as reference.|
Soapbox: My first FMT. Didn't get much sleep last night. Good fun.
|Method: Elecraft K3S / VFO zerobeat by ear|
Soapbox: What a fun exercise since I am mostly deaf! Music to my ears.
|Method: Kenwood TS-890 calibrated w/WWV|
Soapbox: Good signal into NW Wisconsin. Thanks for the experience.
|Method: Set up is mostly old school: Yaesu FT-1000MP Mark V Rockwell/Collins 180S-1 tuner, 40-meter dipole, Fluke 8845A multimeter as an audio frequency meter. Calibrated the receiver with a Bodnar GPSDO. Two-minute run on WWV 2.5 MHz to check conditions and analyses.|
Soapbox: The K5CM-K0WM MUF was only 4.5 MHz so 40 meter signals were almost nonexistent. Heard a few CW characters in the call up. May have heard the unknown, not certain. Strong signals on 80 meters and WWV. Thanks to Connie K5CM for years of support for this interesting event.
|Method: IC-756PRO, computer audio, Visual Analyzer software|
Soapbox: Early run. OK signal on 40m, strong signal on 80m.
|Method: ic-7300 with FLDigi FMT in FMT mode. Made calibration runs with WWV 2.5 and 5 MHz. My gpsdo had a steady frequency throughout the test. I did not use it, but instead used my WWV differentials from nominal as a correction to the reported unknown frequency. FLDigi did not lock onto to 80 meter frequency. It locked onto jammer / tuner upper?|
Soapbox: ic-7300 with FLDigi in FMT mode. Made calibration runs with WWV 2.5 and 5 MHz. My gpsdo had a steady frequency throughout the test. I did not use it, but instead used my WWV differentials from nominal as a correction to the reported unknown frequency. FLDigi did not lock onto to 80 meter frequency. It locked onto jammer / tuner upper? Thanks, I will have to join in with the practice sessions now that I know about them.
|Method: Icom 7300 audio out to Spec Lab.|
Soapbox: 40m S9+25 Solid
80m S9+15 QSB
|Method: Yaesu FTdx-5000, WSPR FMT program|
Soapbox: Great signal strength , no QRM on 40 meters, PSK signal on with you on 80 meters. It's been awhile for me so had to refresh memory on procedures.
|Method: Dipole into XCVR with injection from synthesizer with correction for calculations from WWV-10 and local GPS reference.|
Soapbox: Signals were good into E. Central Florida for all four transmissions. Used aural zero-beating with Double Carrier Heterodyne Technique (two oscillator method). Each time provides an idea on how to improve. Many thanks to K5CM and others for supporting this fun activity.
|Method: Injected signal from HP3336B into K5CM signal from antenna using T connector. HP3336B is referenced using external GPS 10Mhz time base. Using homebrew software with FFT bin size of 0.12 Hz.|
Soapbox: I took several separate measurements during each run. Then I eyeballed them and tossed out outliers. Then I took average of the rest. On both early and late 40m run I saw variance of about 0.3 Hz across 7 separate measurements each of which covers about 8 seconds of time. On 80m I only used early run. All 7 of my separate measurements for 80m were the same i.e. all energy was in the same FFT bin.
Soapbox: First try.. Not sure I did the math right.
|Method: HP3586B receiver and HP3336B signal generator (both referenced by Trimble Thunderbolt GPSDO), outputting to T922 oscilloscope in XY mode. Separately running an SDR to provide band view.|
Soapbox: Both the early and late runs seemed noise-free and pretty stable here in the Los Angeles area. Big thanks to K5CM and the ARRL for another great event.
|Method: Elecraft K3 with EXT REF|
PackRat GPS Locked 10 MHz reference
WB0OEW GPS Source (QEX Sept/Oct 2016)
Spectrum Lab V2.7b12
Soapbox: First attempt to use Spectrum Lab for the FMT. 80m frequency may be 1 Hz off as I forgot to record source frequency.
|Method: IC-7610 w/ internal reference & fldigi & a lot of statistical analysis|
Soapbox: Both 80 & 40 early & late sigs were clear & steady. Let's see if I got ionospheric corrections right this time!
|Method: Icom IC-7300 calibrated to WWV.|
Counting beats with audio generator 1000 Hz combined with carrier on LSB at several frequencies and running the calculations ( hopefully not errors in the way out direction.)
|Method: SDRplay RSPdx SDR. HP3336C and GPSDO. Dipoles|
|Method: K3S calibrated and tuning forks|
Soapbox: Remembered that this was FMT night late, so got the second session with minutes to set up. S9 signal on 40m, seemed more stable than usual. S9 with QSB on 80m, much more unstable than 40m.
|Method: Receiver: Harris RF-590 with OCXO. Recorded audio processed with Mathematica time series notebook.|
Soapbox: 40 meter signal was weak with some QRM, but usable. 80 meter signal was good with some Doppler.
|Method: Icom IC-706 MKII, 80 meter inverted vee, Freq Cal mode of WSJT-X, Excel|
Soapbox: 40 meter signal was weak with QSB, S0 to S5. 80 meter signal was strong , 20 to 30 over S9, but with some QRM from W1AW on PSK31.
Many thanks to K5CM and others who help to run this FMT.
|Method: Yaesu FT-450D, SignaLink USB, WSJT-X software|
Soapbox: This is my first time doing this - completely cold - just kind of thought my way through it. I used 5MHz WWVH to get an idea how far off my receiver was (seems to be +9Hz). When the test was key-down, I used the Rx cursor of WSJT-X to see where the signal was relative to my CW dial position. I adjusted for my +709Hz CW offset, and then added back in the Rx frequency I observed for the signal. I have no idea if this is even correct, but figured I would give it a go since I set an alarm to do it this year.
|Method: All homebrew equipment including a carrier phase tracking receiver, a WWVB referenced frequency standard, a new DDS VFO, loop antenna, and a frequency counter. Method involved phase locking the receiver's 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: Both readings were taken during the early run only. The Kp-index was zero! 40 meter readings had only a 0.1 Hz p-p deviation, while 80 had many deep fades with frequent phase flips resulting in a 0.275 Hz p-p deviation in readings. Many TNX to K5CM and ARRL. GL to all. 73.000 de John, KD2BD
|Method: FLEX6300 with Spectrum Lab. Calibrated to WWV 5.0 MHz signal on 40 mtrs, 2.5 MHz signal on 80 mtrs.|
Soapbox: 80 MTR Sigs were very good, +20 to 30 dB over 9. 40 MTR was weaker, around S9.
|Method: using FLdigi, CHU reference, FT-847, Excel|
Soapbox: 40m was very noisy, 80m nice and loud!
Enjoyed it, 73
|Method: Kenwood TS-590 With SpectrumLab software.|
Soapbox: Made green box last year. Hope it wasn't luck.
|Method: 40-m OCF dipole, IC-7300 controlled by fldigi in Frequency Measurement Test mode.|
|Method: HP 3586A Selective Level Meter referenced to GPS. Inverted V on 40 and 80 meter dipole.|
Soapbox: Always enjoy the FMT! Weak on 40 for the first run but much better at 05:00 UTC. Thanks K5VM for another great test. 73, Steve
|Method: Nooelec NESDR Smart and Ham it up v1.0 with DISTILL AM bandstop filter GQRX on a linux box Goouuu Tech GT-U7 GPS module providing reference frequencies|
Soapbox: First time submitting my best guesses. Thank you for a challenging and enjoyable event. Stay safe.
|Method: IC-705, tuned by eye/ear on the band scope with a little help from the autotune button|
Soapbox: Hi, I’ve never done this before
|Method: Primary setup was an RSP2Pro SDR using SDR Console software. The output drives a virtual audio cable into WSJT-x running in the frequency calibration mode to measure the frequency to .001 Hz. The backup system was an IC-7610 driving WSJT-X. Both receivers reference inputs were driven by a home brew GPS disciplined oscillator. The latest version of SDR Console has a .488 Hz tuning error that needs to be taken into consideration. The IC-7610 also needs a small correction to be made because of the small error introduced in the tuning register. The GPSDO also has an output at 7066 Khz to check the setup.|
Soapbox: Thanks Connie! As always it was both fun and frustrating because I always make some error or delete some data. Fortunately SDR console records the raw samples for later playback and decoding. I copied both sessions and was left with the decision of which values to use. The doppler gets me every time. I hope I guessed correctly. I liked have 2 sessions and the shift in frequency from the callup frequency.
|Method: RSP-DUO INTO A CHA-250B antenna|
Soapbox: Connie, thanks for all the effort you put into this.
|Method: Kenwood TS-2000 with 40 meter inverted V antenna using Spec Lab.|
Soapbox: I was not sure that I was hearing K5CM signal when the Call up frequency was not the same as the Test frequency.
|Method: Icom IC-7610 on AM, GPS 10Mhz Freq. Std. as time base. Set 7610 for best resolution, peaked display, after test, transmitted receive frequency setting to a high resolution frequency counter thru a attenuator. Recorded frequency display.|
|Method: Flex 6500 coupled to an external "$100 ebay" GPSDO. Used WSJT-X for the measurements and prior to the test measured WWV on both sides of the test frequency to get an idea of ionospheric stability and a potential correction factor.|
Soapbox: Decided to participate in both sessions to compare the results. Submitting the 2nd run numbers because conditions seemed a bit more stable, but the results were within .4Hz of each other. Both frequencies for both sessions were S9 or better into central Ohio. Thanks Connie!!
|Method: IC 7300 and Spectrum Lab. Radio and computer running for 3 days. Calibrated Spectrum Lab with 600Hz from WWV, and the IC 7300 using WWV and CHU frequencies and applying corrections to 80 and 40M results. Receive antenna 1000' under-water wire.|
Soapbox: Great fun! A little extra challenge with the frequency shifted from call-up and just a minute to measure. Thanks for the event! Awesome signal from K5CM: 599, no QSB, QRM, or QRN.
|Method: Elecraft K3, P3 panadapter, Spectrum Lab. Stabilized rig for several hours beforehand; Zero beat to WWV noting 600Hz on Spectrum Lab; tuned to K5CM and both zero beat and verify frequency center at 600Hz on Spectrum lab. I don't have a good way of getting granularity better than 1 Hz so I use my ear and interpolate between cycles. Same method as in April's test|
Soapbox: I enjoy these events as usual. Signals from K5CM were weak on the 1st showing of 40m a little stronger on 80m. Much stronger on the second run for both bands with only slight fading. Both 80m and 40m seemed fairly calm and quiet. There was some moron tuning right on top of KC5M on the 1st showing of 40m so no joy on that run.
|Method: Kenwood TS-2000 clocked by Bodnar GPSDO, FLDigi on Computer|
Soapbox: First time using FLDigi instead of SpecLab. Had noise on 40m signal. Thanks for doing this guys!
|Method: K3, Spectran, WWV, CHU, 40M dipole.|
Soapbox: Pretty good signals here in PA for both runs. I would have preferred a little more time - the old brain is slowing down. Hi. Again, many thanks to Connie for a first class event.
|Method: Flex 6600 trapped sloper|
|Method: FT-3000 w/DigiPan. Dipoles.|
Soapbox: 0500Z run in STX...40M S7 with much QSB. 80M S9+20 solid.Thanks Connie.
|Method: IC746pro, WSJT-X, calibrated to WWV. G5RV antenna.|
Soapbox: Thanks K5CM! Hope I got in both green boxes, but there is always the unknown factor on my part that can mess things up!!! 73, Mark
|Method: Yaesu FT-920 2 ears. Zero beat WWV at 5Mhz and create correction factor using displayed figure of WWV on dial.|
Soapbox: 40M is a wild guess. I could barely pull out the signal during either time slot. Hopefully 80M entries are better as signals both times were loud and clear!
|Method: ICOM 756 ProIII with Spectrum Labs Software|
Soapbox: I have been a Ham for 62 years and this is my first time! I had some problems in Spectrum Labs where I entered 600 Hz as Correct Freq and my Displayed Freq. After I clicked on Apply the correction did not seem to change anything. Probably operator error
|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: Not as easy as one might think.
|Method: PRO III WSPR|
Soapbox: Signals were good early and late, but with QSB
|Method: IC-7300, Spec lab software and lady luck|
Soapbox: It was a lot easier to find the frequency on the late run. The signals were weak but stronger on the later run. I didn't see significant doppler which surprised me. We need more FMT's as I get pretty rusty between the ARRL runs. Thanks Connie, as usual the FMT was great.
|Method: (2X) SDR-IQ, Reference signal from DG8SAQ VNWA in Sig Gen mode w/BG7TBL GPSDO reference. Beat note recorded as audio on one RX, RF recorded on other and demodulated post test. Audio cleaned up in Audacity then analysis with SpectrumLab using integrated sound card in HP desktop.|
Soapbox: Method has proven to be accurate in previous FMT but is way too complicated and prone to error. I accidentally overwrote some files and had to use early runs that were subject to some QRM and 20-30 dB QSB.
Regardless, it was fun. Thanks Connie!
|Method: FLEX6500, HP Z3801 GPSDO, Gap Titan, FLDigi Ver 4.1.15, Windoze10 (GAG - forced to use this because of the FLEX6500....)|
My Results are From the Late Run (05:00 UTC)
Soapbox: Tried Early Run using "Frequency Measurement Test" mode in FLDIGI - IT WAS A TOTAL DISASTER. No apparent lock of freq indicated and got lots of #VALUE! and #NAME? values in the "Unk Compensated" column. Final values (Average and StdDev) were both given as "#VALUE!"
>>> TOTAL LOSS of any usable DATA! <<<
--- Nothing in the saved file was of any use.
Obviously I did something wrong as the new FMT mode can't be that screwed up.
--- EXTREMELY FRUSTRATING! ---
I then did the Late Run and I used the Freq ANALYSIS mode and it worked flawlessly.
40M run had valid carrier at minutes 3 to 5 for final data. 10.000 Hz shift in carrier frequency at end of min 3 - used min 4 for freq msmt period.
80M run only had 1 min of data at min 23 (stopped at 05:24UTC)
|Method: Reference Signal Delta Measurement: Motorola MFTS, Yaesu FT-980, Fluke 6070A, PC w/ Spectrum Lab|
Soapbox: Thanks Connie! Good signals into MI.
|Method: IC-7300 calibrated to WWV. fldigi used for analysis.|
|Method: WSJT-X v2.2.2 and Icom IC-756ProII. Warmed up the rig for a solid day and ran the WSJT-X calibration routine for 30 minutes about an hour before the event. Measured both runs and then averaged the results.|
Soapbox: Thanks Connie! Lots of stressful fun! My next step is to add a Bodnar GPSDO to the mix to see if I can stay under 0.1 Hz (assuming I can stay under 1 Hz this time!)
|Method: FLDIGI with IC-7300 and Dipole|
Soapbox: Must get more familiar with the technique and the spreadsheet !
|Method: FlDigi, WB0OEW RF generator from Sept 18 QEX, Flex6600. Vertical on 40, K9AY loop on 80. Pre-Set reference about 800 Hz above expected frequency then selected unknown frequency after call up.|
Soapbox: Participated in early test only. S9 signals on both bands. Data was recorded to CSV using Fldigi. Thought I heard a small QSY at end of 40M test. Did not prune any data or attempt any Doppler corrections.
|Method: Elecraft K3 + EXT REF|
Packrat GPS based 10 MHz reference
WB0OEW GPS Source
Spectrum Lab V2.7b12
Initially used the K3 SPOT function to get close to frequency. Amazingly this seems to be good to +/- 1 Hz.
Set GPS source to the spotted frequency.
Set K3 frequency 1 kHz lower.
Record WAV file with Spectrum Lab.
Make wild guess(es) with discrete jumps in measured frequencies.
Soapbox: This has been an interesting week getting familiar with Spectrum Lab for measuring sub-Hz accuracy. I've been testing against 5/10/15 MHz WWV. Over 30 minute periods I've gotten results to within +/- 3 mHz, but have observed some interesting propagation shifts.
Thanks for putting this on Connie.
|Method: SDRPlay RSP1a SDR using SDR Console. Mode set to LSB, freq. set ~1 kHz above published test freq.|
Leo Bodnar GPSDO: freq. set ~500 Hz above published test freq. & coupled into RSP1a input.
Detected output recorded with Audacity.
Freq. difference between Bodnar tone & test signal measured with Virtual Analyzer (524288 point FFT), verified using test tones generated in Audacity.
Soapbox: My first FMT - hope I did well.
|Method: IC-7610 transceiver, 80-40-20m fan dipole, WSJT-X software in WSPR mode to record signal and used FreqCal mode to determine calibration parameters beforehand. Spectra were analyzed with Spectrum Lab v2.95 software by DL4YHF.|
Soapbox: 40m signal at 02:03 UTC was so weak as to require analysis to observe. 80m signal at 02:23 UTC was strong at my QTH as were both 40m and 80m signals for the 05:00 UTC measurements.
|Method: E-probe > TS850 (CW) > soundcard. Measure audio near 800 Hz, work backwards to what incoming RF carrier must have been. Ref external 10 Mhz OCXO calibrated overnight against GPS.|
Soapbox: Tnx Connie. All 4 transmissions S9+ here in Ontario. 40M early/late agreed within a few mHz; 80M was more of a challenge!
|Method: Old-fashioned AM-heterodyne method, with GPSDO as reference for synthesized signal generator about 500 Hz from unknown signal, audio beat tone from AM receiver recorded by SpectrumLab. Results submitted for early (0200Z) run.|
Soapbox: Many thanks, Connie. Signals good but 40 m was a little weaker than usual.
|Method: 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: Signals were good on both bands at both times. I submitted the late numbers assuming that there would be less Doppler shift at that time. The late 80 m was 308 mHz higher than the early and 40 m was 107 mHz higher. We will see if that was the right decision!! Thanks Connie.
|Method: Flexradio 5000a, Antennas; 40m inverted-V, 80m tuned-loop.|
WSJT-X, frequency calibrated using local AM and time-signal stns.
Results are the second run as the std. dev. of the measurements was less than the first run (80m 0.08 Hz, 40m 0.03 Hz)
Soapbox: In the city 80m is so noisy that I used a tuned-loop to null as much noise as possible. Even so the signal was not audible, but was clearly visible on the WSJT waterfall.
Thanks for running the FMT. I appreciate it.
|Method: The receiver was an IC-7410 in USB mode. I used a Trimble GPS-disciplined oscillator clocking a Rigol function generator to give an accurate reference signal on 80m or 40m. For each run, both K5CM and the reference signal were in the passband. Fldigi in FMT mode was used to measure and record the audio frequencies of both K5CM and the reference signal. The measured frequency difference was added to the reference frequency to give the frequency of K5CM. Measurements recorded once per second were averaged to get my final results.|
Soapbox: K5CM was heard well on both runs. Standard deviation of my measurements was lower on 80m for the early run and 40m for the late run.
|Method: FLdigi csv file crunched using Python.|
Soapbox: This lame Python script is driving me nuts.
|Method: Softrock RX Ensemble II, E-MU 0204 soundcard @ 192 KHz. Recorded FMT with HDSDR and recorded CHU 3.33, WWV5, and WWV10 between the 40m and 80m transmissions. Processed later using spectrum lab.|
Soapbox: Thanks again. I was busy during the FMT transmissions so this was my first time scheduling recordings and then doing all processing later.
|Method: IC-718, 40m OCF dipole. Aural zero-beat with 1000-Hz tone, carrier offset +1kHz. Displayed frequency calibrated using WWV @ 2.5 and 5 MHz. Linear fit gave y = 1.0000x - 998.9997 to correct displayed frequency.|
Soapbox: Strong signal on 40m. Very bad constant RTTY-like QRM on 80m; required sliding BPF down to get acceptable carrier beat tone.
|Method: IC-7610 with rubidium reference oscillator. Rigol oscilloscope used to measure frequency offset, then processed by hand calculation.|
Soapbox: good signals and pretty stable for early run.
|Method: Icom 7100 Transceiver used with CW and CW-R measurements of the near-600 Hz. audio output with the 50 Hz. filter in the transceiver. Dial reading to nearest Hertz from IC 7100 used and resolution of the near-600 Hz. audio output from the transceiver improved using audio generator (HP 205AG) to synch the sweep of a scope (Tektronix 535) and a frequency counter (HP 5385A) to measure the generator frequency precisely. WWV 5/10/15 MHz. used to calibrate the transceiver base oscillator frequency earlier in the day.|
Soapbox: Both signals from K5CM were very strong ~ S9+20 dB. Thanks to Connie, K5CM and the ARRL Staff involved with the FMT.
|Method: I ran two stations this time. One is an RF-590 with my own Reference Generator Assy, and the other is a KWM-380 with my own Reference Generator and Synthesizer Assemblies. I use soundcards with their oscillators locked to my GPSDO with Spectrum Lab SW. Antenna is a 43 ft. vertical matched on each band. Measurements from the two stations agreed with each other within 10 mHz.|
Soapbox: Signals here were 1-5 uV on 40M with fast fading. Connie's signal was about 10 uV on 80M with less fading.
|Method: Elecraft K3(s) w/JLT Fury GPSDO. Also used WSJT-X on Mac-mini and hand interpolation of data.|
Soapbox: This is my first FMT. I had difficulty using the WSJT-X data compilation executables. The command line instructions were written for MS Windows and I just couldn't get the commands to find the right files in different directories to execute, so I attempted to interpolate the collected data along with a final WAG.
|Method: IC7610 (locked to GPSDO) into Spectrum Lab|
Soapbox: The early run signals on both 40M and 80M appeared to be "cleaner for measurement" than the later run. 40M early sig was S9+10, 80M early was S9+10, 40M late was S9 and 80M laet was S9+15. Was able to acomodate to the "step function" in freq with no particular problem. Tnx to all for gud test----
|Method: Flex Radio 6500 with Tbolt GPSDO w/HP 10811-60111 10MHZ XTAL OSC PCTEL GNSS1-TMG=40N GNSS Timing Antenna|
|Method: GPS phase-locked reference injected into receiver input. Frequency delta measured with 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: 1st 40m run -90dBm bad doppler no measurement; 1st 80 run -80dBm minimal doppler; 2nd 40m run -90dBm minimal doppler; 2nd 80m run -60dBm minimal doppler; submitted 40 & 80m 2nd runs... TNX to Connie for his continued support of the FMT!! 73 Don W4WJ
|Method: Flex3000 calibrated to CHU, FLDIGI|
Soapbox: Had to use modified antenna due to the remnants of storm ZETA taking down my dipole, also a bit of trouble calibrating the Flex this time.
|Method: IC-7410, FLDigi.|
Soapbox: Didn't have time to calibrate sound card today. Don't remember the last time I calibrated it.
|Method: Hammarlund SP-600|
Soapbox: Sneaky! Thanks for a good challenge!
|Method: HP GPSDO into a HP 3586B Selective level meter 10 MHz input, The frequency is simply read from the digital display. The I.F. at 15625 Hz is fed to the vertical input of a scope while the output of a HP 3556B signal generator set to 15625 Hz is fed to the vertical input on a scope. This gives a Lissajous pattern that moves with doppler shift. The trick is to find a time when the Lissajou is standing still and then read the frequency on the HP 3586B. Sometimes Doppler will briefly stabilize for a good reading and sometimes if moves around so much with Doppler shift a best guess has to be made. It should be mentioned that the HP 3336B is also being stabilized by the HP GPSDO.|
Soapbox: Doppler shift was not too bad on both the early and late runs. Signal strengths were also good at my QTH in Southern California. Thanks to K5CM and ARRL for a fun event.
|Method: "GPS-Based Frequency Standard" (Brook Shera W5OJM SK) controls a 10mHz HP10811 vco - the 10mhz output is then tripled to 30mhz and used to lock the internal IF oscillator in a ICOM-756 to 1Hz accuracy radio on readout - Spectrum Lab - 80 meter Inverted V dipole at 60 feet.|
Soapbox: Great signals from K5CM, on 40 and 80 Call Up times with easy copy. I did not expect the Key Down to move frequency so no data was gathered at 0203Z and 0223Z when frequency moved. ARRL Web FMT site did not mention that the key down would move. Checked Nov QST to remedy the reason for my signal loss. I feel the Key Down times should go back to 2 minutes. Many times in past FMT tests slow QSB and band conditions have lasted much longer than a minute here on the west coast. Longer key down times has allowed partial signal recovery in bad band conditions. Had Fun! Jimmy
|Method: RSP1a SDR, SDRUno software on Windows 10 Home machine. Indoor wire antenna. Nothing else. Auto-calibrated w/ WWV before and after runs.|
Soapbox: First FMT using SDR. Not sure calibration was accurate. I hadn't remembered that call-up and key-down were on slightly different frequencies this time. Maybe I measured both. Confusing. Both signals on both runs were very weak; I probably wouldn't have heard them without SDRUno's waterfall display. Always fun, always a learning experience. Thanks to K5CM as usual.
|Method: K3, SignaLink, RPi 4, Fldigi, HP Z3801A, TAPR TADD-2. Used Fldigi to compare received signal to 1 kHz pulses.|
Soapbox: Good signals in northern Arizona. 40 meter propagation seemed much more stable than 80 meter propagation.
|Method: IC-706MKII with GPS locked 30 MHz fed to reference. Spectrum Lab software.|
Soapbox: Thanks for the signals. I got my info from the ARRL FMT Web site that did not mention frequency changing. So at first, the signal on the spectrum display just went away! And, did it again on 80-m. Between the two runs I found out the mystery and at 0500Z got some measurements. Good conditions with strong signals and narrow spectral width. Always interesting, Bob
|Method: Survey Antenna --> GPSDO --> Dist. Amp --> 10 MHz ref to IC-7610|
Ant -> 7610 -> fldigi FMT mode
MS Excel post processing
Soapbox: Thanks for putting this FMT together.
Likely sources of error include:
- propagation (e.g. Doppler)
- record keeping (was that the early or late run? etc.)
- my skill at using fldigi FMT (more in a moment on that)
- using Excel (accurate, but clumsy and awkward for this application)
- (possible but much less likely) radio (see below)
As with other radios, the external frequency reference determines the IC-7610 frequency accuracy. The IC-7610 also derives its sound card clock from the external reference, so there is no need to "calibrate the sound card". Validated with several runs on local AM stations, as well as WWV when its signal is strong.
A special thanks to the fldigi team (Dave et al).
Things I need to learn more about:
- where does fldigi get the time written for each frequency sample (seems to have no correlation with my PC time, which is set by NTP)
- how can I change the cursors color for the unknown signal (default appears to be black, which is sort of invisible on a black or dark blue background).
I look forward to the next FMT.
|Method: GPSDO stabilized K3 with GPSDO stabilized SigLent 2042X as reference for the fldigi FMT Modem.|
Soapbox: Thanks Connie. 40m early and late runs fairly close but 80m runs did not overlap. Late runs seemed stationary and so used the late results. Always fun and challenging. Trying to understand the Doppler and decide if to offset for Doppler shift still beyond me. Checking CHU seemed Doppler was about 50-70 millihertz. More practice and study!
|Method: Airspy HF+ Discovery receiver running into Airspy SDR# software|
|Method: IC-756 Pro3 and my ears! |
Put rig in CW mode. Calibrated the rig with its frequency cal trimmer to WWV at 5.000000 MHz by matching the received tone to the CW sidetone (not transmitting, of course.) Beat is very obvious when the received tone matches the CW sidetone. Dial is now calibrated.
Adjusted main VFO dial to Connie's test signal so the received tone exactly matched my CW sidetone, then read the frequency directly from the rig's display. Repeated several times and averaged the results.
Soapbox: Thanks Connie for running this test. Lots of fun. Your signals were very strong on both 40 and 80 for both early and late runs.
|Method: ICOM IC-7610 Bodnar mini GPSDO fldigi FMT modem|
Soapbox: Very strong signal again on both bands.
|Method: Bodnar mini GPSDO as internal REF for FT-1000MP. Another Bodnar mini GPSDO supplies reference signal 300 HZ above unknown frequency. Magic T combines attenuated reference and RX ant. Fldigi measures the difference between the two audio tones.|
Soapbox: Fldigi is an excellent tool for FMT. Thanks to Dave, W1HKJ for making it available.
|Method: SDR with GPS|
|Method: FlexRadio 6500 locked to Trimble GPSDO, HP3325A also GPS locked provides 2 kHz audio tone to calibrate sampling rate of Denon digital audio recorder. Sox resamples recorded WAV file from 44.1 kHz to 8 kHz. Homebrew GNU Octave code measures weighted average audio frequency with weighting a function of received envelope amplitude.|
Soapbox: For the 0200Z 40 meter run there was a jammer +4 Hz from K5CM. I narrowed down my tracking filter (in GNU Octave) to about 1 Hz bandwidth and that completely got rid of the jammer. Only 0.006 Hz difference between the jammed 0200Z run and the clear 0500Z run. Thanks for your efforts Connie.
|Method: FLEX 6700; FLDIGI (Frequency Analysis)|
Soapbox: Good signals on 80 MTR; Weak signals on 40 MTR.
Soapbox: 40M was too weak here
|Method: Injected RF reference signal from GPS locked R&S SMHU to IC-7300 in AM mode and measured AF beat note from calibrated internal sound card with Spectrum Lab and Excel.|
Soapbox: Excellent signals on all runs. Had to quickly move reference to high side on first 80m run due to strong RTTY QRM on low side. That was exciting. Only 0.02Hz difference between the two 40m runs, but 0.20Hz between the 80m runs. 2nd 40m run was very stable with 0.02Hz standard deviation. Readings submitted are from second runs. Thanks again Connie!
|Method: Flex-6600 GPSDO locked using the frequency cal feature in WSJT-X.|
Soapbox: Nice signal into SE Wisconsin this evening on both bands. Slight QSB; did not impact measurements.
|Method: CW mode, 600Hz compared on scope with local 600Hz|
Soapbox: Good signals, but with rapid QSB. Didn't try the late runs.
|Method: QCX kit, EFHW ant|
Soapbox: Wasn't sure I was on the freq, but after key down, I heard K5CM sign off, so more confident then.
|Method: GPS HP SLM|
Soapbox: Time got away and I missed the 40 M run. Thanks Connie.
|Method: Equipment: Icom IC-7610 with external GPSDO frequency reference. Laptop running Spectrum Lab software.|
Method: Place radio in USB mode and capture frequency information from audio tone. Measurement is indicated radio frequency plus tone frequency.
Soapbox: This FMT presented unique challenges. The first session near 7064 kHz was obliterated by a jammer sending faux Morse code during the entire measurement minute. The ionosphere was particularly turbulent and caused tone smearing and frequency shifts of up to a full Hz just prior to the run. K5CM's frequency shifted 9-12 Hz between the CW call up and the key-down measurement minute.
|Method: SDRplay RSPdx SDR, Leo Bodnar GPSDO, horizontal loop antenna. WSJT-X in FreqCal mode. Verified receiver calibration with WWV, CHU, other reference stations.|
Soapbox: Thanks to Connie and ARRL for making this event possible.
|Method: Receiver: Icom R-8600|
Antenna: SteppIR DB-36 set for 40m - used for both 40m and 80m
GPSDO: Jackson Labs Fury
Used GPSDO as external frequency reference for R-8600.
Averaged Fldigi measurements during key-down period. Reported measurement is the average of the 0200Z and 0500Z measurements
Soapbox: 200Z Run: 40m: S7 noise, signal S9+10
200Z Run: 80m: S5 noise, signal S6-8
signals slightly better at 500Z
Thanks to Connie, K5CM, for hosting the FMT.
|Method: Flex 6700. WSJT-X.|
|Method: Difference from reference signal method. Elecraft KX3 receiver in USB. QRP Labs HF synthesizer with Rb frequency reference tuned about 50-100 Hz above test signal. Used Spectrum Lab s/w to locate the peak of each signal, measure frequencies, calculate the difference, then write values to a file. Evaluated data in spreadsheet after the test.|
Soapbox: CW call-up easier to copy on 40 and 80m during 0200z tests. QSB on 40m at 0500z. No problem seeing 40m & 80m signals on SpecLab at both times. More practice using the gear and Spec Lab, and analyzing the data has helped me, but still all-thumbs at times. Thanks to Connie and group.
|Method: HP GPSDO to HP generator frequency compare with Adtran on PC|
Soapbox: 80 meters both runs had some dither in frequency so looked at both and took a stab at it. The second 40 meter run was rock solid, so hoping it makes it close. Thanks for the contest! 73 WA7X
|Method: dipole, Flex6400, WSJT-X GDO 10MHZ Reference|
Soapbox: Mistakes were made on the first session on 40M. The 80M frequency was 3598432.260 I thought of splitting the difference but chose to go with the late session for both frequencies. The signal strength was good for both sessions.
|Method: FLDIG. SOUND CARD CALIBRATED TO WWV. HP8935 REFERENCE FREQ. ICOM-718|
Soapbox: Thanks again Connie for another great time! difference between my early and late 40m measurement only .0334 hz however difference between my 80m early and late measurement was .7299 hz. Had to tune quick to collect enough to average. Liked the change this year!
|Method: ICOM IC-756PROII, Wavetek 3002 Sig. Gen, Thunderbolt GPS, Spectrum Lab software, K1JT's FMT program + SWAG|
Soapbox: Signals were strong for 80M & 40M for both runs. However, both the 80M & 40M signals were more stable during the 0500 run.
The old 2 minute key down provided more time to average signal.
On 80M I recorded .4Hz (average) difference between the 2 runs.
|Method: IC-718 controlled by Flrig and Fldigi.Calibrated sound card and warmed equipment for 2 days. Monitored WWV and CHU frequencies to find most stable reference. Take the stable reference frequency and calculate error per hertz. Calculate hertz difference between reference frequency and key down frequency. Then add or subtract error per hertz to key down frequency. Thanks to Connie for his time and equipment again. S9 on 40M and S9 on 80M using end fed antenna.|
Soapbox: Thanks Connie again for your time. S9 on 40M and S9 on 80M using end fed antenna.
HF2V antenna, FT-1000, Signalink USB, HP 3336C signal generator stabilized with GPSDO, SpecLab software
Tune the FMT signal to a beat note of about 700 Hz. Set the signal generator to produce a signal that is about 50 Hz different from FMT signal and with an amplitude similar to the FMT signal. When the keydown begins, use SpecLab on the audio signals to determine the audio frequency difference, add this to the signal generator setting and then export the calculated results.
Soapbox: Thank you K5CM
|Method: TAPR Open HPSDR with Ecalibur 10MHz TCXO with SpecLab. Calibrations with CHU|
Soapbox: Thanks for running the test! 2nd time
|Method: Flex-6600 Internal GPSDO - 10Mhz output tracked as ref in FLDigi. Early run on both 40m and 80m|
Soapbox: Member of the WW0WWV special event club/management team. Got interested in standards being around WWV and working with the engineers for the special event. 40m was weak to me a 2:00z. 80m was pounding string at 2:20z. Lots to learn. No idea how to compute ionosphere changes. Hope I'm close.