Ed,
> what happens when that choke fails the plate blocking cap builds up
> a neg charge on the pi side and has no way to discharge untill it
> goes to receive and it discharges through the pre amp.
But with the PR6 one would expect that negative voltage to impact the
KAT3, the lowpass filters, the PIN diode T/R switch in the KPA3, and
the PIN diode T/R switch on the mainboard *before* it got to the
pre-amp. There are DC paths to ground, blocking caps and several
sensitive components between the antenna jack and the PR-6 that I would
expect to be take the brunt of a discharge before the PR-6 was damaged.
73,
... Joe, W4TV
On 4/29/2012 8:55 PM, K7WIA wrote:
> Gregg, check inside the amp and see if the RF choke between the pi network
> and the antenna jack is OK.
>
> I was running a SB221 converted to 6 and i had a bad choke connection to
> ground and when going to receive it would blow the rec. pre amp.
>
> what happens when that choke fails the plate blocking cap builds up a neg
> charge on the pi side and has no way to discharge untill it goes to receive
> and it discharges through the pre amp.
> the choke will discharge everything from the pi network to the antenna,
>
> FWIW Ed K7WIA
>
> --
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