[R-390] Post to List

[John KA1XC]

Hi Jack,
that must be the "R390 Cookbook" in the FAQ site your referring to.

That thing pisses me off, it should be renamed "How to Butcher An R390" as 
it has some bad mods in there. All he was doing was eviscerating the ant 
relay box so that SO-239 connectors could be installed in place of the 
original antenna input connectors which he didn't like.

There's nothing official at all about that document except for the fact that 
it was typed on MARS stationary. Fortunately the R-390s I've seen come from 
MARS had none of those mods.

I like the fact that the RX input gets disconnected from the ANT contacts 
during Standby or break-in; it protects the input coils from mishaps and 
prevents the AGC from getting clobbered by the loud TX signal which it would 
then need to recover from when switching back to receive.

BTW, when posting to this list you don't need to put Post to List in the 
subject line, the posting  happens automatically when you send the email, so 
just use whatever subject you want.

73,
John




----- Original Message ----- 
From: "Jack Sullivan" <jsullivan10512000 at yahoo.com>
To: <R-390 at mailman.qth.net>
Sent: Wednesday, May 04, 2005 5:25 PM
Subject: [R-390] Post to List


> For R-390 (non "A"), I just saw old original data
> sheet from MARS, showing, among other things, changing
> to ham type antenna connectors, suggesting removing
> the break-in relay at the back of the antenna
> connedector box.  This relay, when set is on break,
> grounds all three of the antenna teminals.  I think it
> best to keep this relay, so terminals are grounded
> during break times when transmitting.  Am I wrong, and
> is the relay really needed for ham use?
>
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