K5CM FMT - March 05, 2009 Results
Transmit frequencies in Hz
80 Meters - 3578029.264 (9:30 pm CST)
40 Meters - 7078480.678 (9:15 pm CST)
80 Meters - 3567556.556 (10:15 pm CST)
40 Meters - 7067009.126 (10:30 pm CST)
Overall readings were down this FMT for various reason but it was interesting to note that the 10 millihertz or better readings were much lower. Part of this might be the omission of 160 meters this time.
The FMT results look like a teeter totter, with the balance over Oklahoma for my run. The West side was moving up and the East side was moving down. By the time Marvin Transmitted everything (ionosphere) was moving down.
Stations submitting readings on all possible bands (4):
K1GGI, W9TJ, WA1ABI, W9ZB, W3JW
A look at all readings 10 millihertz or better:
|N8OB||OH||Lots of QRM and QRN this evening. Still fun to do.|
|W9ZB||IN||Connie, first time for me. All signals had QSB, but all were readable at my shack. Fun! 73, Dick|
|W6OQI||LAX||Good signals from K5CM on 40 and 80 meters. S6 on 40 and S9+10 on 80 meters here in Southern California.|
|K6BZZ||AZ||Thanks for the tests. No copy west coast 40 meter sig.|
|WA1ABI||RI||Very good signals tonight, no QRN. Connie's rebuilt antennas are working FB. Thanks Connie and Marvin.|
|N5LBZ||MS||Very good signals on both bands.|
|N3FG||EPA||Thanks again. I certainly enjoy these events.|
|KD2BD||NNJ||Thanks for your outstanding dedication in working to get your antennas back in the air after the ice storm! Very strong signals were received from Connie on 80, while Marvin flirted with the noise level. Despite having a K-index around zero, signals from both Connie and Marvin experienced noticeable multipath fading (quick, deep fades with a 180 degree reversal in carrier phase coming out of the fade) that undoubtedly affected frequency measurement accuracy.|
|W9TJ||IL||Poor day in Flatrock! Both 40 mtr sigs very poor, S2 max and fading clear out. The 80 mtr sigs were good S9+20 but both very phase unstable. WC 80 had 0.2 hz difference between start of interval and stop while Connie was up and back down with lots of phase wander in between. It was wild and part of the readings are just WAG. 73 and thanks again for a chance to participate. Tom|
|W1PW||AZ||On 80M, K5CM was 579; W6OQI was 559 with Doppler. On 40M, I could not hear either K5CM or W6OQI at all, but SL "saw" a signal (at the right time) that might have been K5CM even though I couldn't hear it. I've posted the calculated 40M result based on what SL 'saw', which might have been (or might not have been) K5CM. Nothing ventured; nothing gained. Thanks Connie and Marvin for running these tests!|
|W3JW||VA||Signal strengths from both stations were better than normal. The doppler effects (particularly on 80 meters) were quite evident, but not at the extreme they can approach. Glad you were able to get your antennas back up and operational. Tnx fer the FMT--- Jeff|
|K5CM||OK||Marvin, your 80 meter signal was very good. The 40 meter signal was near the noise at times. Thanks for doing the West coast run.|
|KE2N||VA||other info by email|
|K1GGI||EMA||Signals from K5CM were good, but 80 was all over the place, several tenths. W6OQI on 80 had deep qsb into the noise, but plenty of signal to work with. Thanks guys.|
K5CM 80 meter readings (3578029.264 Hz)
|Error in Hz|
K5CM 40 meter readings (7078480.678Hz)
|Error in Hz|
W6OQI 80 meter readings (3567556.556Hz)
|Error in Hz|
W6OQI 40 meter readings (7067009.126Hz)
|Error in Hz|
Spectrograph of Marvin's 80 meter signal as copied by K5CM
Hear a brief audio snippet of Marvin's 80 Meter signal as copied by K5CM.
Spectrograph of Marvin's 40 meter signal as copied by K5CM
Spectrograph of K5CM's 80 meter signal as copied and generated by Ken, KE2N
(note that the time scale is not correct in real clock time)
Spectrograph of K5CM's 80 meter signal as copied by John, WA1ABI
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 Tokyo Hy-Power amp running 500 watts 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 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 transmitting system.
80 - Dipole - Four wire, with a 3.5 foot Cage, sloping down from South to North (favors East, West, and North)
40 - Standard 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.