[Elecraft] Interlocking two K3

[Matthew Cook]

Aren't those just virtual widgets that you stitch together in a software
package drop some pins down and download to your FPGA ?

You'd have to be old enough to know they started as silicon, I'm sure I can
find the masks or some bare dies for those here at work (*wink*).

73

Matthew
VK5ZM

On 14 October 2016 at 07:41, Roger Dixon <lists at irdixon.plus.com> wrote:

> 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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