[Elecraft] KAT2 Tuner issue (Ant 1 / Ant 2 switching)

[Don Wilhelm]

Tim,

When ANT2 is selected, do you hear signals if the feedline is connected 
to ANT1?  Are they at the same level as when ANT1 is selected?
If the answer is YES to both questions, then the most likely thing is 
that relay K18 is not switching.  If the signals are reduced when ANT2 
is selected, then at least K18 is disconnecting ANT1, but ANT2 is not 
connected.

If the relay is doing noting at all, it could be either the relay itself 
or the output of the firmware that is at fault.

Look for other causes before changing the relay.  I have seen burned 
leads between the BNC jack and the board (likely caused by lightning). 
Both the center conductor and the shell are connected to the board via 
leads on the back of the jack - be sure to check both.

Relays K17 and K18 are on the control board - which is the upper board 
when the top cover is turned upside down.

73,
Don W3FPR


On 12/5/2016 8:50 AM, Tim Cook wrote:
> I just discovered that I have a problem with my new (to me) K2. It appears
> that the antenna switch is stuck on antenna 1.  Switching between Ant 1 and
> Antenna 2 with the feedline on Ant 1 doesn't change a thing in terms of
> receive signals. The ANT2 indicator turns on when pressing the ANT 1/2 but
> in reality it isn't switching. The tuner works fine when on antenna one.
> There are no signals received when the feedline is  on Ant 2 and the
> indicator for Ant 2 is illuminated.
>
>
>
> With the tuner out of line (CALP or CALS) and switching antennas I cannot
> hear the relay switch between Ant 1 and Ant 2. If I put the tuner in AUTO
> and switch between Ant 1 and Ant 2 I can hear the tuner relays switch.
>