[Elecraft] KPA500 RX Attenuation and TX Without Amp Key

[Dauer, Edward]

Mark —

There may be some non-anecdotal data about this, but just from my 
experience having 35 watts in and 400 out is not typical.  On most bands I 
run about 23 - 25 in for 500+ out, using a K3 as the driver.

Ted, KN1CBR


>------------------------------
>
>Message: 20
>Date: Sun, 15 Nov 2015 13:24:46 -0700
>From: Mark Goldberg <marklgoldberg at gmail.com>
>To: Elecraft Mailing List <elecraft at mailman.qth.net>
>Subject: [Elecraft] KPA500 RX Attenuation and TX Without Amp Key
>Message-ID:
>	<CAKn+a3uBpE2dTAwSF+oi+EHj5XAyZ_d3fy=LQ8F4hyabUyCLWA at mail.gmail.com>
>Content-Type: text/plain; charset=UTF-8
>
>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