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.
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