[1000mp] ft1000mp mkV amp switching

[Jim McDonald]

Dirk,

If you want to add a simple circuit to the SB-220 to bring the voltage down
to 12V @ 2 ma, there was a mod published in QST (January '88, page 45),
which I found to work fine.  The benefit of using that mod instead of the
relay in the MP or Mark-V is silent T-R switching in the transceiver, though
the relay is pretty quiet.  You eliminate any question of relay limitations.

If you don't have access to the article in the magazine or on a CD, I can
fax it to you.  It's just one page.  (I could scan it at work and email too,
but I've never used a scanner!)

BTW, the electronic bias switching mod in May 1974 QST worked well for me
when I had a 220.  I have that article too.  It wasn't QSK but did cut off
plate current during key-up.

Jim N7US



----- Original Message -----
From: <k6se@juno.com>
To: <1000mp@mailman.qth.net>
Cc: <1000mp@mailman.qth.net>
Sent: Thursday, August 29, 2002 3:53 PM
Subject: Re: [1000mp] ft1000mp mkV amp switching


Dirk, ON4ADZ wrote:

"I want to switch a mentioned SB220  rated at 125VDC@80mA."
==========
Connect the TX GND jack on the transceiver rear panel to the ANT relay
jack on the SB-220 rear panel.  Set the LIN OFF/ON switch on the
transceiver rear panel to the ON position.

That's all you have to do.  The relay in your Mk V will handle it ok.


73, de Earl, K6SE