[Elecraft] Interlocking two K3

[Roger Dixon]

Thanks for the comments.  I now have a prototype solution running with a
4027 and a 4528 !!
73
Roger

-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Edward
R Cole
Sent: 11 October 2016 05:50
To: Elecraft at mailman.qth.net
Subject: Re: [Elecraft] Interlocking two K3

The simple fix is to move the 470-ohm resistors to be inserted between pin-1
and Pin-7.  The resistor is used to limit current draw when pin-7 is
grounded (inhibiting Tx).  With pin-10 directly connected to pin-7, pin-7
will go directly to low when pin-10 does.

If you want a little more insurance that current goes the correct direction
add a diode pointing toward pin-10 from pin-7.

I am using inhibit with my station sequencer (except with the opposite
logic: INH=HI):
http://www.kl7uw.com/TX-INHIBIT.htm
also added a little more band logic for use with transverters and disables
inhibit with HF.

73, Ed - KL7UW

-----------------
From: "Val" <val at vip.bg>
To: <elecraft at mailman.qth.net>
Subject: Re: [Elecraft] Interlocking two K3
Message-ID: <835760C8560A48D18E811EB243F91E3E at OFFICE>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
         reply-type=original

Charlie, how this could work after there is no way the TX Inh inputs to be
pulled down?

73, Val LZ1VB

 > Roger:
 > Look at:
 >
 > http://www.kkn.net/~n6tv/SimpleElecraftK3SO2RLockoutCircuit.pdf
 >
 > I belive it's different than the one you described in your email.
 > I've
 > used this one successfully.
 >
 > 73 charlie, k1xx


73, Ed - KL7UW
http://www.kl7uw.com
     "Kits made by KL7UW"
Dubus Mag business:
     dubususa at gmail.com

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