[Elecraft] KPA500 RX Attenuation and TX Without Amp Key

[Ken Wagner K3IU]

The only thing that comes to mind, Mark, 
absent a failed component someplace, is 
perhaps one of the ribbon cables is 
incorrectly installed. Good luck!
73, Ken K3IU
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

On 11/15/2015 3:24 PM, Mark Goldberg wrote:
> I will contact Elecraft tomorrow, but posting in case someone
> recognizes the symptoms.
>
> I just put together a new KPA500 kit. When I select Operate, the RX
> through the amplifier is significantly attenuated, many 10s of dBs.
> The amp will also amplify even with nothing connected to the PA Key
> RCA jack. It seems to amplify OK, 35W in gives 400W out. In Standby
> the RX and TX pass through the amp as expected.
>
> It seems to me that it thinks PA Key is enabled all of the time, so
> when I switch to operate it is in TX mode immediately. I do not see a
> short at the RCA jack.
>
> Any idea of what is going on?
>
> Mark
> W7MLG
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