The XG3 is perfect for this calibration. Freq is not critical as ling as its
close to 50. Our XG50 is actually a little below 50 Mhz. (I think it used the
ref oscillator module from the K3.)
Eric
elecraft.com
On 4/11/2014 1:39 PM, Edward R Cole wrote:
It was suggested I do the Temp Compensation Procedure. Unfortunately I do not
have a stable 50-MHz signal source. However I did run the Reference Frequency
Calibration using my XG3. Call this "Part Two":
I sampled the RF output of the XG3 with my counter and also input that to the
KX3 for the Calib. This required running at 0 dBm to inject strong enough
signal for the counter (approx -3 dBm). I turned on the ATT for the KX3 to
keep input from overdriving. Got about S9 signal level.
I got it adjusted to within about 2-Hz. The XG3 drifts approx +/- 2 Hz so
difficult to set the Ref*Frequency using it. But that eliminated most of the
38 Hz offset I saw last night. Running the Tx at 5w afterward drift was in
the range of 0 to +7 Hz for a 50-second key down run. The drift is not steady
in one direction so average error is probably in the neighborhood of +5 Hz
with 5-Hz uncertainty in the measurement. Crude but gives a ballpark idea
what to expect.
Today's measurements were all with new heat sink installed. Temp Comp.
probably would lower these numbers a bit.
I might try running my K3 as signal source for Temp Comp. if it holds more
stable then the XG3 at 50-MHz. I am using the EXREF so it may be better?
73, Ed - KL7UW
http://www.kl7uw.com
"Kits made by KL7UW"
Dubus Mag business:
[email protected]
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