[Elecraft] Sequencer keying with K3/XV-144 without rigblaster?

[Evert Bakker (PA2KW)]

Lance,

This is the only proper way for serious VHF stations. Use your feedback
contact of the final RX/TX coaxial relay (which is most probably mounted in
the top of your tower) as a final go for the RF out of the K3 by using the
TX-Inhibit Line.

73's Evert PA2KW

Cu

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Don Wilhelm
Sent: Wednesday, January 14, 2009 23:31
To: w7gj at q.com
Cc: Elecraft Discussion List
Subject: Re: [Elecraft] Sequencer keying with K3/XV-144 without rigblaster?

Lance,

It has already been thought of and included in the K3 - see below.

I am not sure if you are referring to the KEY OUT jack on the back of 
the K3 or the PTT jack.
The PTT jack is an input - one would plug the footswitch into it, or 
alternately use the PTT on the microphone or the PTT from the RS-232 input.
KEY OUT becomes active as soon as the PTT is activated - there is also a 
KEYOUT-LP signal on the ACC connector that acts the same as the KEY OUT 
jack except with a limit of 10 ma.

The K3 normally transmits RF after the KEY OUT is active by the amount 
of time entered into the CONFIG menu TX DLY parameter - that provides a 
maximum of 20 ms RF delay.

For those who need more time that that, there is the TX INH function 
that can be configured for pin 7 of the ACC connector - it can be 
configured for either TX INH LO=Inh or HI=Inh.  This signal will prevent 
the K3 from transmitting RF until the inhibit signal goes away.  See the 
K3 Owner's manual page 19.

73,
Don W3FPR

Lance Collister wrote:
> Hi Dave,
>
> You raise an interesting question....maybe that is the elegant solution to

> integrating the K3 into old kluge-like VHF stations with lots of coaxial
relays, 
> homebrew amplifiers, etc.
>
> PTT output jack on the rear of the K3 could optionally be configured as a 
> sequencer itself, so it would close an adjustable amount of time (up to a
second) 
> BEFORE any RF would be permitted to be generated after the rig is put into
XMIT by 
> either the microphone/footswicth or the serial port PTT lines.
>
> Certainly, this option would not be selected by those who want to work
QSK!  But 
> they would simply not choose the option.  If this option were stored by
band, you 
> could have a built-in sequencer only on certain bands, and QSK on other
bands! 
> With such an option, you would never have to worry about blowing anything
up, 
> regardless of how the K3 incoming PTT line itself was keyed ;-)
>
> What do you think, Elecraft?  VY 73, Lance
>   
>
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