Many thanks for the lead. Strangely the frequency separation between
adjacent clicks seems to be related to the number, separation and strengths
of strong received signals. Also on occasion when tuning through a 40m BC
station whose received carrier level is in the region of -10dbm, the
receiver will lock onto the BC signal and not let go until it has been tuned
further a few kHz, typical is approx 3 kHz and always (I think) down in
frequency, then a 'plop'. This is why I have the *suspicion* previously
mentioned.
73,
Geoff
GM4ESD
----- Original Message -----
From: "Kevin Schmidt" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Monday, February 12, 2007 9:06 PM
Subject: Re: [Elecraft] Tuning noise on K2 - 40M
I think this is the known "feature" described by Wayne in:
http://www.ac6rm.net/mailarchive/html/elecraft-list/2000-03/msg01007.html
73 Kevin w9cf
My K2 also produces clicks on 40m which disappear if the antenna
is disconnected or turned away from strong BC stations above 7100
kHz. Running CAL PLL has not cured the problem, and I have since found
the same problem on 15m. It might exist on other bands but I have not
had the time to check. I have a *suspicion* that strong signals from the
antenna / banspass filters reach the VCO and Reference oscillator area
of the RF board by some direct route, not via the Preamp / attenuator /
mixer and momentarily 'upset' the VCO causing the click. The VCO (VFO)
could be upset if some product produced by multiple mixing attempted to
take over control of the loop, sometimes a problem with locked loops. But
I cannot confirm this yet due to lack of time at the moment.
73,
Geoff
GM4ESD
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