[Elecraft] K3 lock out via Inhibit

[Oliver Dröse]

Hi Igor,

you may want to check this very simple circuit:
http://www.kkn.net/~n6tv/SimpleElecraftK3SO2RLockoutCircuit.pdf

73, Olli - DH8BQA




----- Original Message ----- 
From: "Igor Sokolov" <ua9cdc at gmail.com>
Cc: <elecraft at mailman.qth.net>
Sent: Wednesday, March 27, 2013 8:28 PM
Subject: [Elecraft] K3 lock out via Inhibit


> Yet again I need to organize lock out for a pair of K3s. Therefore  couple 
> of questions for those who knows how to do it.
>
> 1)The manual says one need 2.2 to 10k pull up resistor on pin 7 of the ACC 
> connector from 5V source. There is no 5V source in ACC connector (BTW 
> Elecraft could easily provide one either on pin 12 or pin 5. Both of them 
> are now used for GROUND). The easy answer to the problem is to use 12V 
> out RCA socket on the back panel. Is it necessary to step down that 12V to 
> 5V or it is safe enough to connect say 20K pull up resistor from 12V to 
> pin 7 ?
> 2) Is it OK to use Keyout-Lp from pin 10 of one radio to Inh pin 7 of the 
> other radio and vise versa. What I am concerned about is what happen if on 
> one of the rigs someone unintentionally switch the setting of pin 7  from 
> Inh to K3 ON?
>
> 73, Igor UA9CDC
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