Posted by
Julian, G4ILO on
Oct 15, 2007; 11:21am
URL: http://elecraft.85.s1.nabble.com/K2-Is-TX-frequency-susceptible-to-RF-on-chassis-tp454716p454723.html
David.
Your situation as described in another email seems very similar to
mine. I am operating a K2/10 with an indoor antenna, a closed loop
approximately 20m in circumference with the feedpoint about 2m
directly above the K2. The loop is fed via the KAT2, some 2.5m of
RG-213 and an Elecraft BL-1 balun at the feed point. I have no RF
ground, being in an upstairs bedroom. When connected to the power
supply, the K2 is grounded through the electrical supply earth, but I
have never noticed any difference when operating it from its internal
battery, completely isolated.
In over 6 years of operating, including frequency-sensitive digimodes,
I have never noticed any frequency shift of the K2 TX frequency.
I just attempted, by holding the FT-817 with whip antenna right next
to my K2, to test for sensitivity to UHF, while monitoring a PSK31
station on 20m, and there was no perceptible change in frequency.
Therefore I wonder if you should look elsewhere for the cause of the
problem. Before investigating inside the K2, is your power supply
immune to RF? Does the voltage change in the presence of RF?
--
Julian, G4ILO K2 s/n: 392 K3 s/n: ???
G4ILO's Shack: www.g4ilo.com
Zerobeat Ham Forums: www.zerobeat.net/smf
On 10/14/07, David Woolley <
[hidden email]> wrote:
> I checked the transmit frequency relative to the receive one with a
> dummy load, at 10 watts, and there is no problem. It's possible that
> this is simply a combination of my voice and the filter settings, but it
> could also be that RF on the chassis is upsetting the BFO and/or
> reference oscillator control voltages. Is this a known issue?
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