[1000mp] MP Receive Problem

Mon, 27 May 2002 19:36:36 -0400

I noticed this problem on my MP in the past.  About a year ago I built a
outboard transistor switch to drive the relay in my amplifier, it operates
from the band data connector.  I wanted to get away from the MPs internal
relay. I don't think I have had the problem since.  I don't use the internal
tuner normally.

I don't know if the outboard transitor stage, which I built to handle more
current, made the difference or not.  Just another data point.

Tom, W1TO

----- Original Message -----
From: "Barry N1EU" <[email protected]>
To: <[email protected]>
Sent: Monday, May 27, 2002 1:53 PM
Subject: Re: [1000mp] MP Receive Problem

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

>From: "Bill Rinker" <[email protected]>
>Reply-To: [email protected]
>To: <[email protected]>
>Subject: [1000mp] MP Receive Problem
>Date: Mon, 27 May 2002 09:57:49 -0600
>
>My FT1000MP was purchased in 1995.  I had no receive problem running
>barefoot or with my previous Knw TL-922A Amp.  In February of this year I
>replaced the Knw TL-922A with a new Ameritron AL-1500.  I immediately
>started to randomly incur the attenuated receive signal problem which could
>be corrected with a "dit" or pressing the PTT switch.  Without the linear,
>running barefoot, the attenuated receive problem disappeared.
>
>In checking with Ameritron they advised the following, quote:  "Try using a
>dollar bill to slide between the contacts of the T/R relay.  There may be
>some residue on the contacts causing the problem."  That solved the
>problem.
>
>Hope this helps!
>
>Bill - NE9Z
>
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