K5CM FMT - July 9, 2008 Results
Transmit frequencies in Hz
160 Meters - 1847004.096 (10 pm CDT)
80 Meters late - 3567012.339 (9:45 pm CDT)
40 Meters - 7067321.337 (9:30 pm CDT)
80 Meters - 3565002.763 (10:50 pm CDT)
40 Meters - 7065001.352 (10:30 pm CDT)
Stations copying 2 readings to 10 millihertz or better in the last five FMT's:
Stations copying 2 readings to 10 millihertz or better in the last four FMT's:
Stations submitting readings on all possible bands (5):
W3JW, WB9FIP, W1PW, K1GGI, W9TJ, K5BTK, VE2IQ, WB0LXZ, W2FD, W0PHD
Stations copying 3 readings to 10 millihertz or better:
Stations copying 2 readings to 10 millihertz or better:
WB9FIP, W3JW, K6OQK*
A look at all readings 10 millihertz or better:
*K6OQK is in ground wave/direct, range of W6OQI
Stations copying all 5 readings to 100 millihertz or better:
Stations copying 4 readings to 100 millihertz or better:
WB0LXZ, W9TJ, VE2IQ,
Stations copying 3 readings to 100 millihertz or better:
K1GGI, K5BTK, K6OQK*, W3JW, WA2DVU
Stations copying 2 readings to 100 millihertz or better:
K5CM, VE2AZX, W1PW, W2FD
Stations copying 1 readings to 100 millihertz or better:
K6APW/7, W0PHD, WA4FJC
|N8OB||OH||It's been so long I forgot what I was doing before. 80 and 40 M were good but 160 was very weak. Fun as usual.|
|W2FD||WPA||All transmissions by K5CM and W6OQI were readable but not strong in WPA. Thanks for the efforts in sending the tests and reporting the results.|
|W0PHD||MN||Between the Summer time QRN pactor and SSB fron VE land on 40 makes for a lot of difficulty in nailing a signal down and of course the usual entry errors tell me how rusty one can become. It still is a lot of fun and am looking forward tro many more in the future - THANKS signal makers."|
FMT conducted from the back of the Suburban in the Food Lion Parking Lot
in Shepherdstown, WV after a very pleasant dinner and evening with
friends. The resolution of
the FFT bins in Spectrum Lab, given the sound chip and configuration in
the Toughbook, is only 0.17 Hz so my submission to three places is a bit
presumptious. Set up:
Master Reference OCXO run from it's own battery for the whole day,
trimmed to about 3 parts in 10^9 before departure and rechecked at
midnight EDT. Found to be 4
parts in 10^9 low. The OCXO
controlled an HP3325A which was loosely coupled to an ICOM R-75.
Power for the 3325A was from a RediLine 12V-110V rotary converter
running on a deep cycle marine battery.
Very noisy acoustically, (I'll have to move it out of the
Suburban) but electromagnetically
rather quiet. Antenna was a
mag-mount active whip of my own design.
Procedure was to tune in the signal and adjust the 3325A signal
close to the FMT signal on Spectrum Lab and compare the difference
there, then calculate the FMT signal's delta from the 3325's signal.
I used the cursor readout to get the frequency from Spectrum Lab.
Reference in the Lab is a TrueTime GPS Disciplined Oscillator.
Plans for the future include disciplining the OCXO, resisistive
splitter for conducted coupling of the 3325A signal, and recording high
resolution wave files for off-line analysis.
All this, hopefully, without creating undue EMI.
Signals on 40 and 80 were easy to copy and plenty strong enough,
signal on 160 was a little weaker, but well copyable, even with the QRM.
Good job, and many thanks. 73, Tom.
(good going Tom!!!)
|WA2DVU||SNJ||At 2200 edst doppler error was: 15mhz=.123 high, 10mhz=.031 high, 5mhz=.040 low and 7335 =.040 high. I did not figure it int calc. Sigs s1 - s4 - lots of qrn. Fun time!! Thanks Connie for the test. 73, WA2DVU Cape May, NJ|
|WA4FJC||VA||I could not hear anything in VA on 160 M. Signals were good on 40 and 80. Used an HP 3586A.|
|K5BTK||MS||The K5CM 40m signal was great. All others were weak to very weak with QSB. The west coast 80m signal was so far down in the summertime atmospheric noise that the call-up was unreadable. Here's to an upswing in the solar cycle!|
|VE2IQ||ON||good sigs. callups a few mHz lower than these keydowns. Why?|
|WB0LXZ||KS||Doppler spread West-Coast signals more than 1 Hz wide here.|
|VE2AZX||QC||No copy on 160m. Strong sig on 40 and 80m. Thanks for running the FMT's and for quickly giving the results back. Jacques, VE2AZX|
|K6APW/7||OR||Fast and deep QSB at times. Nil on 160.|
|W9TJ||IL||All signals good and above the QRN level. The 80 meter West Coast run had the wildest phase instability I have ever seen. Propagation of WC-40 and all K5CM signals was good. Thank you for hosting this FMT.|
|W6OQI||LAX||The K5CM 40 meter signal was S9 in Southern California. I had difficulty with the K5CM 80 meter signal due to some local QRM that slowly moved across the K5CM signal. I may have mistakenly measured the slow moving signal which may have covered up the desired signal. In any event I don't have much confidence in my measurement of the K5CM 80 meter signal this time.|
|K6OQK||LAX||There was a lot of Doppler spread on Connie's 80 and 40-Meter signals tonight and nothing heard at all on 160-Meters. Glad to see the FMT's are back and runing and that you have your new reference going. I'm sure we all missed the FMT's. Again, thanks to you Connie and Pam for great FMT's and commeraderie. Burt, K6OQK|
|K1GGI||EMA||Plenty of qrn, but copied all sigs. Hoping not off by too many Hz this time.|
|K5CM||OK||Marvin, good signals tonight. The spread was probably typical for a summer evening.|
|W3JW||VA||SIGNAL STRENGTHS WERE BETTER THAN NORMAL WITH MODERATE QRN. WAS EVEN ABLE TO MAKE FREQUENCY COUNTER MEASUREMENTS ON THE 40M WEST COAST TRANSMISSION; USUALLY WC SIG STRENGTHS ARE SUITABLE ONLY FOR SL ANALYSIS. PLENTY OF DOPPLER TO CONTEND WITH ON BOTH 80 AND 40 METERS. TNX FER THE TEST!|
those of us that take accuracy serious, thank you Marvin and Connie for
a well run FMT.
|W1PW||AZ||Using FT-817nd with TCXO, SL and KMIK, a local HD BC station that I believe (hope!) is GPS-Disciplined. Thanks, Connie and Marvin, for conducting these tests!|
K5CM 160 meter readings ( 1847004.096Hz)
K5CM 80 meter readings ( 3567012.339Hz)
K5CM 40 meter readings ( 7067321.337 Hz)
W6OQI 80 meter readings ( 3565002.763 Hz)
W6OQI 40 meter readings ( 7065001.352Hz)
*K6OQK is in ground wave/direct, range of W6OQI
Marvin's 80 meter signal did not exhibit the normal sawtooth waveform usually associated with signals in the evening hours. Instead there were areas as shown by the arrows that were more representative of the real frequency. Had I simply taken the average of the four hot spots I would have been right on. Zero on the above spectrogram is 3565000 Hz.
Transmitting equipment used by K5CM for this FMT:
A Trimble Thunderbolt 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 Dentron 2500 running 400 watts on 160m, 225 watts on 80m, 200 watts on 40m. 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 WWVB. 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 but calibrated by the GPS system before the FMT.
160 - Vertical
80 - Cage Dipole (favors East, West, and North)
40 - Dipole (favors East, West)
Current W6OQI FMT transmitting equipment:
My Transmitting setup consists of a HP Z3801 clocking a HP 3336B which drives a Johnson Viking I transmitter, the output of which is attenuated by a 6 db attenuator, to then drive an Icom PW-1 amplifier to about 500 watts. 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.