[1000mp] MP Receive Problem

[John Hirth]

Barry,

I'm not using the band data signals to key an amp and do have the RX
problem. I use my late 95 MP's internal relay with an older Alpha 77
(higher PTT voltage - not Dx/Sx). I see the problem even when not
running the amp, of course the relay still could be at fauly. But
naturally I can't remember if the problem started before or after I
began using the MP's PTT relay and the amp. I'm not pointing directly to
this relay, as the problem still could be elsewhere in the MP.

73, John W2KI
-------

Barry N1EU wrote:
> 
> I've had the problem on my late '99 MP on two completely different linears
> (Ten-Tec Centurion and Alpha 99) that I purchased new, so I'm convinced it
> is not the linear - this problem is internal to the MP.  But it is
> interesting to consider that both linears were keyed using the TX GND and TX
> INHIBIT signals on the Band Data jack.  It is possible that the problem is
> in MP circuitry associated with those two lines, i.e., in the
> transmit/receive changeover logic.  Has anyone seen the problem and not
> controlling their linear with those control lines or while running barefoot?
> 
> I initially thought the problem was in my Ameritron remote antenna switch.
> I am convinced it is internal to the MP, and as I said previously, occurs on
> both A/B antenna inputs even though the B input had hardly ever been used
> before.
> 
> 73,
> Barry N1EU