K5CM FMT - December 10, 2008 Results
Transmit frequencies in Hz
160 Meters - 1846081.460 (9:15 pm CST)
80 Meters - 3577085.077 (9:00 pm CST)
80 Meters - 3568489.476 (9:45 pm CST)
We are still experiencing very low solar flux values. It seems as thought this bottom is lasting forever. At least it does make for good FMT conditions, on 80 and 160 meters. Thanks to all that participated and special thanks to the new guys that took part in this FMT.
Stations submitting readings on all possible bands (3):
K0MZ, K1GGI, K6APW, K6BZZ, K6HGF, K6OQK, K7TT, KG0HY, KT6KT, N5DM, N7EP/7, VE2IQ, W0PHD
W1PW, W3JW, W9TJ, WA1ABI, WB0LXZ, WB6ZQZ
A look at all readings 10 millihertz or better:
*K6OQK is in ground wave/direct, range of W6OQI
|K0MZ||KS||Thanks for the FMT. As I use WWV 10MHz as a reference for my counter, the WWV signal was very weak tonight. After the WC run I noticed that there was another weak signal very near WWV and I may have tuned up my counter to that wrong signal. So, I made some corrections to my measurement for the WC run. I may have also had a problem with the 80 meter K5CM run. For what it is worth, there are the measurements.|
|K1GGI||EMA||Decent copy, moderate qsb on all sigs. Lots of spread on W6OQI. Thanks Connie and Marvin.|
|K2TV||NLI||Great Fun! I let my IC-756ProII warm up for five hours. In the CW mode I measured the frequency using the IC-756ProII readout and switching between CW and CW-R until the audio tones matched on the counter when switching between the two while adjusting the frequency on the radio.|
|K5CM||OK||Hey Marvin…. Was surprised when I had to tune a little for you tonight… good copy here in Oklahoma|
|K6BZZ||AZ||Good sigs from Connie; fairly stable; 5-7/8. Using indoor loop on 160 and it works. First attempt. Lots of doppler on W6OQI; +/- .5 Hz. As always, thanks much for running the tests.........|
|K6HGF||LAX||Good 80 meter signal from K5CM. 160 meters pretty weak. Thanks for the FMT.|
|K6OQK||LAX||Connie's signals were good but with a lot of spread. Marv's signal had a lot of spread for the first minute and then settled down to a nice straigt line on SL. Thanks to Connie and Pam, and to Marv for another great FMT. - K6OQK|
|K7TT||WWA||I enjoyed this test. Although the signals were weak since have only a trap dipole in attic (no 160M), it was a fun exercise to try and measure the signals. Equipment here is pretty simple, a ICOM IC-737 and homebrew 3.4Ghz Pentium WinXPPro running fldigi as prime measuring tool but also running Spectrum Lab simultaneously (on same computer) which was good to watch at the same time. Used WWV at 2.5Mhz and 5Mhz to calibrate rig (hopefully). If I got close with the very weak signals it will be amazing. Jim|
|KG0HY||NE||Signals were a nice -100db. I use my Winradio G313, with Digital Suite Advanced Audio Scope and Spectrum Analyzer. Antenna is a 100 feet long dipole, up 20 feet. Computer, is 1.8GHz, running Windows 2000. 73, Casey, KG0HY|
|KT6KT||NV||FT-847. RST: 160M;479, 80M;599, WC-80M;599. Thanks.|
|N3FG||EPA||First time. 80M good, 160 fair. 706 and Spectran. Mny tnx. Frank, N3FG|
|N5DM||STX||Resubmission with subtraction of 650Hz CW offset frequency from actual dial frequency of TS-480S while receiving unknown frequency in CW mode.|
|N5LBZ||MS||Connie's signal was quite weak but mabe we will get within a few Hz|
|N7EP/7||AZ||All signals were fairly strong but noisy into AZ tonight. My Frequency Standard, WWV, was equally noisy so my measurements are an educated guess. Thanks Connie. Your FMT's are great. Earl, N7EP|
|N8OB||OH||Had a birdie on 80M so I knew I was in trouble. 160 M was weak but could copy it. I can tell I am getting rusty at this. Copied the WC-80M run FB|
|VE2IQ||ON||Strong sigs, no QRM|
|W3JW||VA||Good signals from both stations tonight. Plenty of doppler on the 80 meter freqs to keep the analysis interesting! TNX fer the FMT!|
|W6IHG||VA||Was able to get both 80m and 160m this time. Using "delta reference" method with FT2000 (cw-lsb, agc off, 400hz) and HP3336 with 10mhz GPS reference and GPIB controller to begin automation. Jerry|
|W6OQI||LAX||K5CM signal was S9 on 80 meters with minimal doppler shift. 40 meter signal was not as strong, about S5, but with more doppler shift.|
|W9TJ||IL||Band conditions and signals good. Doppler dropped west coast freq slightly during run. Thank you for the opportunity to participate. 73 Tom|
|WA1ABI||RI||Wild Doppler on all freqs tonight. Thanks Connie and Marvin.|
|WA2USJ||NLI||First time K5CM FMT|
|WA3BDV||EPA||I could not hear the 80m west coast transmission. I'm just using a Pro3 and switching between CW/CWR listening for a pitch change, then verifying against CHU at 3330. Lots of fun and a good challenge. Thanks Connie!|
|WA4FJC||VA||Good signal here in VA this time.|
|wb6zqz||EB||Warmed up ProIII and Spectrum Lab. Calibrated against WWV and Trimble Thunderbolt at 10mhz. 160m sigs in the noise. Plenty of doppler on all signals, especially eastern. Signal strength varying by 2+ S units.|
K5CM 160 meter readings ( 1846081.460 Hz)
K5CM 80 meter readings ( 3577085.077 Hz)
|Error - Hz||ppx|
W6OQI 80 meter readings ( 3568489.476 Hz)
|Error in Hz||ppx|
*K6OQK is in ground wave/direct, range of W6OQI
Spectrograph of Marvin's 80 meter signal as copied by K5CM
In this classical example above, the saw-toothed shaped waveform is very evident. Sometimes in the early evening the real signal is very near the right rising edge of the saw-tooth. I must say however, I was very lucky to hit the nail on the head with this much Doppler present. Also keep in mind this technique does not always work and a simple average would yield better results.
Hear a brief audio snippet of Marvin's 80 Meter signal as copied by K5CM.
audio/w6oqi shack dec08-snip.wav
Spectrograph of K5CM's 80 meter signal as copied and generated by Burt, K6OQK
In the above spectrograph 15625 is 3577085 Hz. Frequencies to the Left are higher.
Spectrograph of K5CM's 80 meter signal as copied and generated by Jeff, W3JW
In the above spectrograph, 1500 is 3577086 Hz. Jeff uses LSB so frequencies to the Left are higher.
Hear a brief audio snippet of K5CM
Spectrograph of K5CM's 160 meter signal as copied and generated by Jeff, W3JW
In the above spectrograph, 1500 is 1846081 Hz. Jeff uses LSB so frequencies to the Left are higher.
Spectrograph of W6OQI's 80 meter signal as copied and generated by Jeff, W3JW
In the above spectrograph, 1500 is 3568490 Hz. Jeff uses LSB so frequencies to the Left are higher.
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. 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.
160 - Vertical
80 - Cage Dipole (favors East, West, and North)
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.