[Elecraft] K2 - hang up problem

[Don Wilhelm]

Tony,

I have never seen a problem like that before, but I would suggest 
starting with the 8R and 8T voltage rails on the control board.  If they 
are not switching properly between transmit and receive it could 
conceivably create a problem like you describe.

OTOH, hearing your SSB signal in the headphones is not normal for the 
K2, and only normally happens when the menu SSBA parameter is set to 
BAL.  If the menu is being changed inadvertently during a transmit to 
receive transition, suspect RF is somehow getting into the K2 
(RF-IN-THE-SHACK problem??).  Alternately, control board U6 may not be 
properly seated in its socket - try re-seating it.

Keep us posted on what you find.

73,
Don W3FPR

N2TK wrote:
> Before I tear into the K2 to find  out what happened today I figured I would
> ask on here in case someone has seen this  problem before.
>
> It receives fine on all bands. When I transmit (does not matter what power
> level or what band) it hangs up. If I keep it on the transmit mode power out
> is fine. If I let it go back to the receive mode the receive signals are
> very, very weak. If I talk into the mike, there is no power out and I have
> side tone in the headset so I can listen to my transmit audio.
> To correct this problem I need to change bands or shut off then on the
> radio. 
>
> Anyone hear of this problem before?
>
> Tnx for any ideas before I pull out the schematics and take off the covers.
>
> 73,
> N2TK, Tony
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