[Elecraft] my K2 and its different frequencies.

[Carel, pc5m]

-----Original Message-----
From: Carel, pc5m [mailto:pc5m at xs4all.nl] 
Sent: Tuesday, August 23, 2005 1:25 AM
To: 'Merlarts at aol.com'
Subject: RE: [Elecraft] my K2 and its different frequencies. 

Could it be you have an issue with the 8V internal supply ? Maybe on
transmit it is somewhere loaded too much so it will drop and the BFO will
also change slightly ? You could measure at pin 8 of U11. 

Also you could verify that the signal called V_BFO is not changed between RX
and TX. It can be measured on pin1 of RP6. 

Another possibility could be a faulty Q24 (J310 FET) used for setting the TX
power, normally the impedance on the gate of this FET wouldn't change
substancially if V_ALC is applied, but maybe it is defect ? If you adjust TX
power is the BFO frequency also changing ?

Gl,

Carel, pc5m
 

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Merlarts at aol.com
Sent: Tuesday, August 23, 2005 12:31 AM
To: elecraft at mailman.qth.net
Subject: [Elecraft] my K2 and its different frequencies. 

Many thanks to all who answered, including those who helpfully suggested
that I might be using RIT or XIT without knowing it.  
 
I just put a frequency counter on the BFO on my K2, and it changes about
70Hz when it goes from receive to transmit.  Yeah, I know, there's not
supposed to be any change, but I get a 70Hz CHANGE IN FREQUENCY BETWEEN
RECEIVE  AND TRANSMIT.  
 
Freq. counter is loosely coupled to the BFO.  
 
Any ideas?
 
Merlin, W3ICT
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