[Elecraft] Inhibit connection between K3 - KPA500 - KAT500

[Dick Dievendorff]

The KAT500 connectors pass the INHIBIT line thru from K3 to KPA500.  INHIBIT
is connected so that the KAT500 microcontroller can read it, but I've not
found a use for it thus far. Current KAT500 firmware does not read INHIBIT.

The KPA500 owner's manual describes how it works.  I think maybe in some
sort of SO2R protective configuration I could find a use for it, but I
haven't needed to use it thus far. 

If I were constructing a new cable and had a spare wire left over, I'd
connect it.  But it's not currently needed or used by the KAT500.  

The KAT500 inhibits amplification by breaking the amplifier key (PTT) line
path between exciter and amplifier, a technique that works with most
amplifiers.

73 de Dick, K6KR



-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Ueli Zulauf
Sent: Thursday, November 29, 2012 2:08 AM
To: elecraft at mailman.qth.net
Subject: [Elecraft] Inhibit connection between K3 - KPA500 - KAT500

Subject: Inhibit connection between K3 - KPA500 - KAT500

Preparing the cables for the planed KTA500, I have a question: 
does the handshake between KPA500 and KAT500 need the inhibit line (ACC pin
11) and for what purpose? Remark: no frequency band shall be inhibited.
DIGOUT1 (K3 - ACC pin 11)  is used in my setup to power up the preamplifier
on 6m. In order to do that, I had to isolate the pin 11 on the ACC cable
going to the KPA500.

73 de Ueli, HB9MFK
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