[Elecraft] KPA500 Standby to Operate problem

[Mark Goldberg]

Is there an asterisk on the display of the KPA500? If there is, it
thinks it is in TX mode even if the rig is not in transmit. I had that
problem and it was a poorly soldered resistor on the front panel
board, but a shorted TX line (RCA cable) would do the same thing.
Elecraft replaced the board. You should not have an asterisk when you
switch to operate until you key the transmitter.

Hope this helps.

73,

Mark
W7MLG

On Thu, Feb 18, 2016 at 8:41 AM, Michael Shortland
<michaelgs1 at talktalk.net> wrote:
> My KPA500 [#934] has developed a fault in Receive mode.   The strength of the signal received by the K3 driving the amplifier reduces significantly when the KPA500 is switched from Standby to Operate using the front panel pushbutton.  The S meter displays a 3 to 5  ‘S’ point reduction in signal strength on all bands when this happens.   The amplifier appears to operate correctly in all other respects and will deliver 500W to my KAT500.    No fault is indicated on the amplifier front panel.
>
> Is this a known problem, eg a faulty TR Switch?
>
> 73 Mike G0EFO
>
>
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