[Elecraft] New KPA500 1.11 f/w Released

[Edward R. Cole]

Fred,

I have a similar issue in wanting to enable INHIBIT with 
transverters.  I did that by using the BAND0 line to control a relay 
(K1) which connects the Inhibit line when I want it.  Now I am going 
to add 6m and have decided to use DIGOUT1 to handle enabling 6m.  I 
will join BAND0 and DIGOUT1 by the use of two steering diodes to 
isolate from each other but either can drive the relay (via an NPN transistor).

Here is the diagram (it has extra circuitry for a FT-847 which you 
should ignore):
http://www.kl7uw.com/TX-INHIBIT.htm

You may be able to find a source of 13v  or 5v from the K3.

IN your case you would use BAND3 and BAND1 summed to drive the relay 
instead of DIGOUT1.

73, Ed - KL7uW

------------------------------

Message: 7
Date: Thu, 1 Sep 2011 14:04:30 -0600
From: "Cady, Fred" <fcady at ece.montana.edu>
Subject: Re: [Elecraft] New KPA500 1.11 f/w Released
To: "Eric Swartz  WA6HHQ - Elecraft" <eric at elecraft.com>,
         <elecraft at mailman.qth.net>
Message-ID:
         <A15F7F22B01D1449AD4D685B1EFED5AF0140D033 at coeexch2.coe.montana.edu>
Content-Type: text/plain;       charset="us-ascii"

Hi Eric et. al.,
I wonder if it would be possible to have the INHIBIT# enable/disable be
on a per-band basis for the KPA500. That way one could use DIGOUT1 to
disable the amp on a band, say 17m or some band where the antenna SWR is
too high, and to allow it to be enabled on 6m when DIGOUT1 is used to
turn on the PR6. One downside of this that I can see is that if DIGOUT1
is used to disable the amp on 17m it would also turn on the PR6 so a
receive antenna wouldn't be able to be used on that band.

73,
Fred



73, Ed - KL7UW, WD2XSH/45
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