Bill,
#1 - the K2 A=B button is working as designed - the VFOs do not track
each other, they are independent. This is normally the first thing one
would do when setting up split on the K2 - set the VFOs equal, then move
your transmit VFO up to where you wish to transmit and activate SPLIT.
#2 - It is difficult to say where the distortion is coming from without
further investigation. That is not normal. One thing I might mention
is the possibility of hum from an AC transformer being coupled into the
K2 VFO. Try moving the K2 at least 2 feet (more if possible) away from
anything on the desk containing a transformer - some desk lamps contain
a transformer in the base. Should a nearby transformer (or other form
of magnetic coupling) be the source of the distortion, and you have to
place the device near the K2, Elecraft has a VFOSHLDKT mod kit available
that can be added if needed.
If the distortion is not caused by a magnetically coupled field, you
will have to do some testing to find the source. I would suggest
connecting the output of the product detector (available at the J5
location on the RF Board) to an external audio amplifier or computer
soundcard input to see if the distortion is present there.
If you have the KDSP2 option installed, try putting it into BYPASS to
see if the distortion stops. It is possible to make the KDSP2 noise
reduction so aggressive that it begins to distort. If that is the
cause, turn off the NR and NT settings in the DSP menu or set the
parameters back to the defaults (see the KDSP2 manual for instructions)
73,
Don W3FPR
On 2/11/2015 12:23 PM, William Schmidt wrote:
I'm looking for some help with my K2 (SN 5165) that has developed the following
problems:
1. Even after pushing the A=B vfo control, B does not track with the A vfo but
remains where it was when the A=B was pushed.
2. When I turn on the K2 the audio initially sounds fine but after a variable
interval it becomes distorted and muffled. The strange thing is that if I
cycle the power off and on the audio returns to normal. This doesn't affect
the transmitter.
The voltages on the 5v and 8v lines measure ok. I'm not sure if this is a
problem with the MCU or with a relay that needs to reset. Is this a problem
that others have noticed? I'm at a loss as to how to track this down.
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