I did, and got within 27 mHz for one of the runs with my GPSDO'ed
5000a. Better than 0.1 Hz on three of the four.
Brian, WB6RQN, got within 5 mHz on one!!! I got within 10 mHz on a
test awhile back.
One problem with the 5000a is that the tuning step size is pretty big.
Sound card programs like Spectrum Lab or FLDIGI can help. I have used
both in the past.
Jerry W4UK
At 06:14 PM 10/9/2010, you wrote:
Thanks for the alert on the K5CM Frequency Measuring Test a few nights ago.
That test uses two stations to send a CW carrier on 160, 80 (twice) and 40
meters. A FMT is something totally new to me. My only preparation was to
calibrate the radio carefully against WWV using its built-in scope. My
receiver was in the DSB mode. I used the scope to guess-timate the frequency
to an additional decimal point.
Few entrants use a radio alone. Many have costly GPS based frequency
calibration sources or the like and complex schemes to interpret the
frequency. Experience counts. So does speed, since you only have three
minutes to come to a conclusion. In other words, my entry wouldn't threaten
the experts who come within one or two MILLI-hertz.
But my stock Flex did very well. Three of my four readings were within 1/2
Hz. On 40 meters I was off by .96 Hz. QRN on 40 made the weak signal
difficult to read on the scope. Still, accuracy was better than .25 PPM on
each reading, well within Flex specs. Anyone else participate?
Jeff K0OD
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