[Elecraft] Dual Ptt

[Bob McGraw K4TAX]

Excellent point Bob.   I'd not thought about that approach.

Thanks

73

Bob, K4TAX


On 11/7/2018 5:01 PM, Bob Wilson, N6TV wrote:
> On Mon, Nov 5, 2018 at 12:32 PM Bob McGraw K4TAX <rmcgraw at blomand.net>
> wrote:
>
>> I basically do the same with different radios.   The K3S is connected to
>> the KAT500 and then through the KPAK3AUX cable to the KPA500.   The
>> other radio has a Amp Key output basically an open collector to ground
>> which I connect to the PA Key input.
>
> That's a very convenient way to do it, but connecting the radio directly to
> PA KEY on the KPA500 bypasses an important safety feature of the KAT500,
> which is designed to OPEN the PA KEY line while it is tuning. So I'd
> recommend connecting the other radio's Amp Key output to the PTT RLY (in)
> connector of the KAT500, and the PTT RLY (out) of the KAT500 to the KPA500
> PA KEY.  This places the KAT500 in SERIES between the transceiver's KEY OUT
> and the KPA500's KEY IN.
>
> This is well documented in Figures 2, 3, and 4 in the KAT500 Owner's Manual
> <ftp://ftp.elecraft.com/KAT500/Manuals%20Downloads/E740183%20KAT500%20Owner's%20Manual-%20Rev%20C6.pdf>
> .
>
> 73,
> Bob, N6TV
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