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

[Lance Collister, W7GJ]

Hello Evert,

Yes, I think I may rig up something to use the K3 TX-Inhibit line when I 
take my K3 on DXpedition to E51 in 2 months.  Good idea!  TNX and 73, Lance

Evert Bakker (PA2KW) wrote:
> 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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-- 
Lance Collister, W7GJ (ex: WN3GPL, WA3GPL, WA1JXN, WA1JXN/C6A, ZF2OC/ZF8)
P.O. Box 73
Frenchtown, MT  59834  USA
QTH: DN27UB
TEL: (406) 626-5728
URL: http://www.bigskyspaces.com/w7gj
2m DXCC #11/6m DXCC #815