K5CM FMT - April 15, 2009 Results
Transmit frequencies in Hz
80 Meters - 3579427.283 (9:45 pm CDT)
40 Meters - 7078390.644 (9:30 pm CDT)
80 Meters - 3567000.235 (10:45 pm CDT)
40 Meters - 7067000.146 (10:30 pm CDT)
Several first timers, along with great participation from the regulars, made this another successful FMT.
I think we were all a little surprised when we did not hear Marvin's usual strong 80 meter signal. I was quickly checking if I was tuned to the the right published frequency, and checking to see if I had the proper antenna selected. As it turned out Marvin had lost his Amplifier and was just running 20 watts from his vintage Viking I transmitter. Many of us were still able to find him in the noise and make a reading, with some readings being quite good.
Stations submitting readings on all possible bands (4):
K0MZ, K6APW, K6BZZ, K6HGF, K6OQK, N5DM, N7EP, VE2IQ, W0PHD, W1PW, W2FD, W3JW, W9TJ, W9ZB, WA1ABI
A look at all readings 10 millihertz or better:
*Burt is in direct/ground wave range of Marvin (about 8 miles).
|WA4FJC||VA||Good signal tonight. HP 3586B with dipole antenna.|
|WA3BDV||EPA||Could not hear WC-80. WC-40 very noisy. East Coast signals very good in EPA.|
|WA2DVU||SNJ||Wish that the guys that always have the fx to the correct number would share some of their secrets on how they correct for doppler!!!! 73, Bill WA2DVU|
|WA1ABI||RI||Very good sigs tonight from Connie. Marvin was fair on 40m but inaudible on 80m. Spectrum Lab showed a signal buried in the noise, so that's what I recorded for 80m WC. Thanks Connie and Marvin for another fine FMT.|
|W9ZB||IN||This time, west coast sigs were very weak at this QTH. K5CM sigs were good.|
|W9TJ||IL||K5CM 40 mtrs qrn S7-9 sigs S7. 80 mtrs solid S9+20. W6OQI 40 mtrs solid S9+10. 80 mtrs almost not there. I caught only one full call sign during call up and only a few pop ups out of the noise during test interval. Fun but doppler played havoc with K5CM 40 mtrs as it showed a 0.05 hz rise during the test interval. Again, thank you for the FMT. 73 Tom|
|W6OQI||LAX||Sorry about the weak 80 meter signal from W6OQI, amplifier failed and the output power for 80 meters was only 20 Watts instead of 500 Watts. The K5CM signal was 10 over 9 on forty meters with a doppler spread of about .12 Hz. The K5CM 80 meter signal was running S 7 with about a .13 Hz doppler spread.|
|W3JW||VA||Iam glad to know that Marvin was running QRP on his 80 M transmission. For a wile I thought my antenna had fallen down into the weeds! I had difficult time acquiring the signal on that transmission as it was not strong enough to copy the CW very well. I got data for about the last 2 and a half minutes of his transmission. Doppler spread and shift were quite noticeable on all four test signals--- spread was one to two hz during the long dash transmissions Tnx es 73 Jeff|
|W2FD||WPA||Good Signals on 40 meters from K5CM and W6OQI although there was a lot of static on all bands. 80 meter signal was good from K5CM. W6OQI was just noticeable in the noise and the frequency result for 80 meters was more of a guess than a measurement. Thanks again for the efforts of K5CM and W6OQI.|
|W1BW||EMA||SDR-1000 with Ozy/Janus all clocked by Thunderbolt GPSDO. Frequencies directly as measured...was in a hurry and didn't have time to take doppler measurements of reference frequencies.|
|W0TFW||KS||Signals were poor on 40m but very strong on 80m. I don't have my secondary standard completed yet, so I had to dig out the LM-15. I'll be interested to see how well I did with the old meter. Thanks for conducting the test, I'm looking forward to the next one. - Jeff|
|W0PHD||MN||SSB QRM on 80M but your sig was strong and over road QRM W6OQI was very very weak on 80 meters I also had some instability on my local signal. One of these days I am going to start using the computer programs to compute the frequency.|
|VE2IQ||ON||Good sigs except WC-80M quite weak here. Reported freq is average over keydown time.|
|N9XR||IL||WC-80M was too weak for me to hear more than a few dits and dahs. But anyway this is my first FMT. Probably have not figured out how to measure frequency very accurately, but I thought I would give it a try and see what the newer TS-480HX would do for me here. No analysis software or anything. Just heterodynes and a scope. Thanks for the Yahoo group and letting me participate.|
|N8OB||OH||I had to rush home from Radio Club meeting and try to remember what I am doing. Always fun..|
|N7EP||WWA||The FMT both before and after sunset here in Seattle was a real challenge. The ionosphere was doing a hula dance. I had plenty of signal strength, except on the WC80M, but the signal spread was very large, between 0.5 and 1 Hz on all frequencies. All my entries are guesses picking a spot in the middle of the very noisy signal. Tonight, the FMT was more of an art than a science. Thanks Connie for the experience. Earl|
|N5LUL||WTX||just wondering how the little yaesu ft857d did....|
|N5DM||STX||W6OQI 80M transmission buried in the background QRN.|
|N3FG||EPA||Lots of QSB and QRN here on 80M. 40M not too bad. Mny tnx.|
|KD2BD||NNJ||Good signals were received from Connie on 80 with only some slow, shallow fading (low multipath). I stayed up and listened for Marvin on 80, but did not copy his signal.|
|K9KK||OK||Doppler shift on the K5CM 40 meter run was 6 Hertz from the lowest to the highest measured frequency. Probably multiple paths since we are only 120 miles apart. I think I measured a bogus signal on his 80M run. Did not hear W6OQI.|
|K7TT||WWA||No copy on 80 meters, no signals, just noise. K5CM very strong 40 meter signal here but couldn't find it in SpecLab display quick enough, no reading. Figured it out for the W6OQI 40 meter run and got at least one reading. Thanks.|
|K6OQK||LAX||Connies signals were both reasonably good but with deep fades. Marv's signal was great on 40-Meters but his 80-Meter signal was just above the noise and at one time Spectrum Lab showed it "forking" into two different directions. I was using my very short "Longwire" for Marv since he and I are only about 8 miles apart. I always enjoy the FMT's and this was no exception. Thanks to Pam for loaning us Connie and to Herta for loaning us Marv for the evening. Burt, K6OQK|
|K6HGF||LAX||Thanks Connie & Marv.|
|K6BZZ||AZ||Good reasonably stable signals from K5CM. W6OQI 40 meter signal 589 but frequency not stable. 80 meter signal 569 and frequency not stable. Hard to get a solid reading. +/- about .2 Hz throughout the runs on both bands. Lots of fun and thank you both for running the tests.|
|K6APW||EB||All signals good tonight, but pesky local shot noise.|
|K5CM||OK||Marvin had a good 40 meter signal but I was lucky to get a reading on the 80 signal.|
|K1GGI||EMA||K5CM 40m kept creeping up, about 200mHz over the run. I guessed at the middle. Sigs were easy copy, but never heard W6OQI on 80, now see he had probems, plus heavy QRN here. Thanks for another fun one.|
|K0MZ||KS||I used a Heathkit HW-8 for my receiver, a Drake TR-7 for my frequency source, and a Heathkit IM-4100 counter. Keeping the counter tuned to WWV was the hardest part as it really drifts. The 80 meter signal from California was very weak tonight. Thanks for the great fun.|
|AF9A||IN||Good signals on both 40 and 80 this time. Thanks Connie!|
K5CM 80 meter readings (3579427.283 Hz)
K5CM 40 meter readings (7078390.644 Hz)
W6OQI 80 meter readings (3567000.235 Hz)
W6OQI 40 meter readings (7067000.146Hz)
Spectrograph of Marvin's 40 meter signal as copied by K5CM
Hear a brief audio snippet of Marvin's 40 Meter signal as copied by K5CM.
Spectrograph of Marvin's 80 meter signal as copied by N7EP
Hear a brief audio snippet of Marvin's 80 Meter signal as copied by VE2IQ.
Spectrograph of Marvin's 80 meter signal as copied by WA1ABI
Spectrograph of K5CM's 80 meter signal as copied and generated by N7EP
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.
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, the output of which is attenuated by a 6 db attenuator, to then drive an Icom PW-1 amplifier to about 500 watts on 40 meters. On 80 meters no amplifier was used and the output power was 20 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.