K5CM FMT - May 20, 2009 Results


Transmit frequencies in Hz


    80 Meters - 3577890.644 (9:45 pm CDT)

    40 Meters  - 7078629.148 (9:30 pm CDT)



     80 Meters - 3566999.847 (10:50 pm CDT)

     40 Meters - 7067000.356 (10:30 pm CDT)

Summer time propagations conditions are now with us. A long with that comes the ever present summer time QRN.  Doppler and spreading seemed much more pronounced on 40 meters, with no sub 10 mhz readings for this FMT. Even so, VE2IQ, and W3JW managed two each, sub 10 mhz readings, on the two 80 meter runs. Participation was down a little, but that is to be expected as outside activities are on the increase. Thanks to all that participated.

Stations submitting readings on all possible bands (4):






A look at all readings 10 millihertz or better:



W3JW VA 3577890.647 0.003 8.38E-10
K6APW/7 OR 3577890.650 0.006 1.68E-09
VE2IQ ON 3577890.651 0.007 1.96E-09
K6OQK* LAX 3566999.847 0.000 0.00E+00
VE2IQ ON 3566999.842 -0.005 1.40E-09
K7TT WWA 3566999.854 0.007 1.96E-09
W3JW VA 3566999.838 -0.009 2.52E-09
K5CM OK 3566999.857 0.010 2.80E-09

*Burt is in direct/ground wave range of Marvin (about 8 miles).




K0MZ KS Thanks again, Connie and Marvin, for fun time with FMT.  Interestingly enough, while my wife was watching TV, her TV provided me with another secondary frequency standard, the color burst, to calibrate my counter, as it wasn't very far away from your 80 meter signal.  I didn't hear Marvin's 80 meter signal.  His 40 meter signal was quite weak here in Kansas.  I used the same 30+ year old equipment for this test as that is all I have.
K5CM OK Hey Marvin... ur signals were pretty good considering the lower power for this FMT. Thanks for doing the West Coast Run.
K6APW/7 OR Eighty meter signal surprisingly strong S6-S7 a half-hour before local sunset. Both 40M signals S8-S9 with QSB.
K6OQK LAX Connies signals were S-9 on both 80 and 40-Meters but both bands had a lot of "Evening Doppler". Marv, while only about 8 miles away had two signals that appeared only a tenth Hz or so apart apart at our home due to a reflection. Both had about the same stability so I went with the stronger one.:>  I always enjoy the FMT's and the commeraderie that follows.  Thanks again to Pam for loaning us Connie and to Herta for loaning us Marv.    Burt, K6OQK   
K6YAZ LAX For the first time I used an RFSpace model SDRIQ receiver at .99 Hz FFT bandwidth, and HP 3336B as a frequency marker, locked to GPS. The receiver works very well; just not stable enough for FMT. Software was SpectraVue 3.00 Beta.
K7TT WWA Band conditions here were good on 40M and poor on 80M. A lot of warble on the signals made measurement interesting. Great test. I learn a little each time. Thanks Jim
KD2BD NNJ Tuned in, turned on, and "freq'd" out!  Copied K5CM on 80 with considerable signal strength variation.  The two 100-second frequency measurements I made differed by 145 mHz, which is considerably greater than during last month's FMT.  I selected my first reading, rather than an average, since the signal appeared to be a bit more stable during my first measurement period.  Fingers remain crossed until the results are published. Thanks for the FMT (and the extra long key down period!)
KE2N VA Lots of Doppler spreading this time - I just eyeballed the answer. Spectrograms sent by email
N5DM STX Kenwood TS-480SAT and DigiPan v2.0. All signals S9+ except W6OQI below QRN (S9)on 80M.
VE2IQ ON Good sigs from K5CM, plots as expected.  W6OQI sigs OK. Marvin easy to find near published freq. Tnx to both.
W0TFW KS Used an LM-15 frequency meter/ARR-41 receiver calibrated with an OXCO secondary standard. Thanks for conducting the test, it was a lot of fun. I'm looking forward to the next one! 
W1PW AZ Thanks Connie and Marvin for these tests!
W3JW VA The "Doppler Deamons" have not abated. All sigs were of good strength except the 80 meter west coast run where the signal was weak and barely readable ( but loud enough to copy the CW). Tnx to both you and Marvin for the transmissions.
W6OQI LAX 40 meter signal was S9 but with LOTS of Doppler.  80 meter signal was also S9 but with much less Doppler here is Southern California.
W9TJ IL Signals from Oklahoma were real good.  West coast was about S6.  All were rather phase stable.  Thank you again for making the test possible.
W9ZB IN Conditions were good & Calif sig strength was ok, maybe S-5, but had lots of jerky phase shifts. Still fun, tho!
WA1ABI RI Good signals from Connie, fair sigs from Marvin tonight. The aether was really wobbly, though - lots of Doppler. Thanks Connie and Marvin for another good run.
WA2DVU SNJ Quite a lot of qrn this evening - WC 40 was in the noise and could not hear WC80.  Thanks again Connie.  73, Bill, WA2DVU
WB9CHY IL Nice signals, listening near Chicago--10db over 9 on both bands. This is a LOT of fun--I'll blame W9ZB for getting me hooked on this.  I need to install about 3 more digits on the ProIII, however...



 K5CM 80 meter readings (3577890.644 Hz)


W3JW VA 3577890.647 0.003 8.38E-10
K6APW/7 OR 3577890.650 0.006 1.68E-09
VE2IQ ON 3577890.651 0.007 1.96E-09
WA1ABI RI 3577890.657 0.013 3.63E-09
W0PHD MN 3577890.659 0.015 4.19E-09
W9TJ IL 3577890.660 0.016 4.47E-09
K6OQK LAX 3577890.625 -0.019 5.31E-09
K8JQ WV 3577890.670 0.026 7.27E-09
W6OQI LAX 3577890.615 -0.029 8.11E-09
KD2BD NNJ 3577890.590 -0.054 1.51E-08
WA2DVU SNJ 3577890.700 0.056 1.57E-08
KE2N VA 3577890.700 0.056 1.57E-08
W1PW AZ 3577890.730 0.086 2.40E-08
W9ZB IN 3577890.558 -0.086 2.40E-08
K6YAZ LAX 3577890.400 -0.244 6.82E-08
N5DM STX 3577889.550 -1.094 3.06E-07
WB9CHY IL 3577891.983 1.339 3.74E-07
K0MZ KS 3577892.500 1.856 5.19E-07
K6BZZ AZ 3578010.590 119.946 3.35E-05
W0TFW KS 3578760.000 869.356 2.43E-04


 K5CM  40 meter readings (7078629.148 Hz)


WA1ABI RI 7078629.159 0.011 1.55E-09
KE2N VA 7078629.16 0.012 1.70E-09
W0PHD MN 7078629.166 0.018 2.54E-09
W3JW VA 7078629.191 0.043 6.07E-09
W6OQI LAX 7078629.1 -0.048 6.78E-09
K6OQK LAX 7078629.082 -0.066 9.32E-09
K7TT WWA 7078629.23 0.082 1.16E-08
W9ZB IN 7078629.232 0.084 1.19E-08
VE2IQ ON 7078629.059 -0.089 1.26E-08
W9TJ IL 7078629.253 0.105 1.48E-08
K6APW/7 OR 7078629.011 -0.137 1.94E-08
W1PW AZ 7078628.929 -0.219 3.09E-08
WA2DVU SNJ 7078628.892 -0.256 3.62E-08
K8JQ WV 7078628.75 -0.398 5.62E-08
K6YAZ LAX 7078629.6 0.452 6.39E-08
K0MZ KS 7078630.3 1.152 1.63E-07
N5DM STX 7078627.95 -1.198 1.69E-07
WB9CHY IL 7078630.958 1.810 2.56E-07
W0TFW KS 7079700 1070.852 1.51E-04





 W6OQI 80 meter readings (3566999.847 Hz)


K6OQK LAX 3566999.847 0.000 0.00E+00
VE2IQ ON 3566999.842 -0.005 1.40E-09
K7TT WWA 3566999.854 0.007 1.96E-09
W3JW VA 3566999.838 -0.009 2.52E-09
K5CM OK 3566999.857 0.010 2.80E-09
W1PW AZ 3566999.868 0.021 5.89E-09
WA1ABI RI 3566999.821 -0.026 7.29E-09
K6BZZ AZ 3566999.775 -0.072 2.02E-08
K6YAZ LAX 3567000.100 0.253 7.09E-08
W9ZB IN 3566999.481 -0.366 1.03E-07
W0PHD MN 3567000.354 0.507 1.42E-07
N5DM STX 3566998.700 -1.147 3.22E-07




 W6OQI 40 meter readings (7067000.356Hz)


K5CM OK 7067000.338 -0.018 2.55E-09
W1PW AZ 7067000.321 -0.035 4.95E-09
K6BZZ AZ 7067000.405 0.049 6.93E-09
K6OQK LAX 7067000.413 0.057 8.07E-09
K7TT WWA 7067000.234 -0.122 1.73E-08
VE2IQ ON 7067000.217 -0.139 1.97E-08
W3JW VA 7067000.217 -0.139 1.97E-08
K6APW/7 OR 7067000.198 -0.158 2.24E-08
W0PHD MN 7067000.180 -0.176 2.49E-08
WA1ABI RI 7067000.056 -0.300 4.25E-08
W9TJ IL 7067000.010 -0.346 4.90E-08
W9ZB IN 7066999.850 -0.506 7.16E-08
WA2DVU SNJ 7066999.756 -0.600 8.49E-08
K0MZ KS 7066998.750 -1.606 2.27E-07
N5DM STX 7066998.300 -2.056 2.91E-07
K6YAZ LAX 7066971.600 -28.756 4.07E-06





Spectrograph of Marvin's 80 meter signal as copied by K5CM



Hear a brief audio snippet of Marvin's 80 meter signal.

audio/w6oqi may20-09 80m-note-snip.wav


Spectrograph of Marvin's 40 meter signal as copied by K6OQK




Spectrograph of K5CM's 80 meter signal as copied by K6OQK









Spectrograph of K5CM's 40 meter signal as copied by K7TT



Spectrograph of K5CM's 40 meter signal as copied by KE2N




Spectrograph of K5CM's 80 meter signal as copied by KE2N





Transmitting equipment used by K5CM for this FMT:

A HP Z3801 GPS frequency source clocks a HP-3336B. A 10 db transistor amp follows and drives a 12BY7 / pair 6146. Then to the final amplifier, a Tokyo Hy-Power amp running 500 to 600 watts out on 40m, and 80m.  There are no mixers or any device in the chain of amplifiers that might impact the accuracy of the GPS frequency source.  As a reality check,  I periodically log the frequency source against WWV and other GPS referenced sources.  I monitor each transmission with a completely separate receive system to look for any instability or short term drift. The separate system is not locked to the GPS transmitting system.

I typically see considerably less than 1 mHz difference at 10 Mhz when comparing  two Z3801's over a 10 second period. 



 80 -  Dipole - A 3.5 foot cage made from four wires in a box shape, sloping down from South to North (favors East, West, and North)

 40 - Standard Dipole hanging between two 80 foot towers. (favors East, West)




Current W6OQI FMT transmitting equipment for this FMT:


My Transmitting setup consists of a HP Z3801 clocking a HP 3336B which drives a Johnson Viking I transmitter to about 80 watts out. The antenna is an inverted Vee which favors north and south from the Los Angeles area.



Note: Because I put the results up quickly, there will be mistakes, so don't hesitate to point them out quickly. 






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