[Elecraft] Amplifier Hook Up

[David Ferrington, M0XDF]

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)