[Elecraft] Amplifier Hook Up - PW-1

[John Gaynard]

K3 #157 (factory-assembled) ordered on May 2 arrived on Xmas eve.

Here's my question.  How do you connect an ICOM PW-1 amplifier to the K3.  I
know that the ALC is a yet to be resolved issue.  I have an IC756ProIII
already connected to the amp so the K3 will be the second exciter.  Has
anyone connected a PW-1 to a K3 yet?  I have to run a cable from the send2
connection on the PW-1 but what does it connect to on the K3.  There are no
amplifier connection diagrams in the K3 manual (yet, anyway!!)  

Incidentally, in a side-by-side comparison, the K3 receiver wins hands-down
- no contest.  I really want to try the K3 with the PW-1 in the Stew Perry
Challenge this weekend. 

John K8WDN
K3 #157
K2 #85

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of David Ferrington,
M0XDF
Sent: Thursday, December 27, 2007 4:47 AM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] Amplifier Hook Up

That PTT RCA socket is an INPUT - to close the PTT line  - ie it puts the K3
into transmit.


On 26/12/07 19:16, "Dave G4AON" <elecraft at astromag.co.uk> sent:

> I use my K3/100 with an Acom 1000, I just connect the phono keying
> output to the amplifier keying input with a phono to phono screened
> lead. The Acom doesn't have ALC output, so it's not an issue. The
> K3/Acom combination works great on CW with no relay thumps or clicks
> from the almost silent vacuum relay in the Acom linear.
> 
> The ALC input to the K3 is positive going (0 to + 5 Volts on pin 15 of
> the Aux I/O socket) and has been discussed on the Reflector previously.
> 
> 73 Dave, G4AON
> K3/100 #80
> ================
> 
> When examining the back panel of the K3 I see an output for PTT to control
an
> amplifier but I don't see any input for the amplifier AGC output to
control
> the transmitter power.  Surely this common feature was not overlooked on
> such a feature rich transceiver.  Where is the connection for this control
> and what control voltage is it looking for?  I don't see an amplifier hook
> up diagram in the manual either.  Surely someone using this transceiver
with
> an amp!
-- 
Man is the best computer we can put aboard a spacecraft and the only one
that can be mass produced with unskilled labour.
-Wernher von Braun, rocket engineer (1912-1977)



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