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:
*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)
K5CM 40 meter readings (7078629.148 Hz)
W6OQI 80 meter readings (3566999.847 Hz)
W6OQI 40 meter readings (7067000.356Hz)
Spectrograph of Marvin's 80 meter signal as copied by K5CM
Hear a brief audio snippet of Marvin's 80 meter signal.
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.