[Elecraft] Dual Ptt

[Don Wilhelm]

Bob,

Since you do have to turn a switch, my preference would be to build a 
switch to change the KEYOUT line and also operate a relay in the coax 
line.  I think it give a bit more protection from "tired operator syndrome".
Additional switch contacts could switch microphone AF and PTT between 
the transceivers and other contacts could switch key and paddle lines.  
But then that is my preference.  I use RS-232 A/B switches for things 
like that.  The ones that handle DB25 connectors have 25 switch contacts 
- plenty for whatever you want to switch.

73,
Don W3FPR

On 11/6/2018 10:25 AM, Bob McGraw K4TAX wrote:
> I use a manual 2  x 1 coax switch to switch between 2 radios to one amp input.  As to VOX it is always off unless I turn it on.  I usually only use one radio at a time.
>
> Bob, K4TAX
>
>
> Sent from my iPhone
>
>> On Nov 6, 2018, at 9:09 AM, Don Wilhelm <donwilh at embarqmail.com> wrote:
>>
>> Bob,
>>
>> That is a simple solution, but how do you handle the RF output of both transceiver to the single RF in on the amplifier?
>>
>> The only caution I can give of with a configuration like that is for the operator who uses voice modes with VOX turned on.
>> Most ham mics are wired for VOX operation - in other words, the mics are 'live'.  For those who use speakers too, the mic on the 'not in use' can pick up the sound from the 'live' transceiver speaker and set it in transmit mode.
>>
>> The use of headphones will likely cause no problems, but the combination of VOX ON with speakers live can cause a problem for voice modes.
>>
>> My preference is for hard switching to eliminate a lot of "strange happenings" - besides, I like to feel I am in control of such things.
>> Such a switching arrangement can be easily built, but there are several SO2R boxes that will accomplish the same thing.
>>
>> 73,
>> Don W3FPR
>>
>>> On 11/5/2018 3:30 PM, Bob McGraw K4TAX 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.   Either radio will key the KPA500 and no switching or changes required. Just cables and connectors. Adding the KAT500 requires a second KPAK3AUX cable and slightly different wiring configuration. However, with either radio, no other changes required.   Just be sure you have the correct drive power set and TUNE power set for each radio before hitting the PTT switch.
>>> All this is very easy to accomplish with the cables and connectors provided by Elecraft.  The worst part is that hams "over think" the solution.
>>> 73
>>> Bob, K4TAX
>>>> On 11/3/2018 1:21 PM, Ralph S. Turk wrote:
>>>> Hi all
>>>>
>>>> I need to be able to key the KPA500 & KAT500 from both a Yaesu 1000mp and my K3.
>>>>
>>>> I assume (I know don't assume) I can use diodes to isolate both radios.
>>>>
>>>> Any thoughts?
>>>>
>>>> Ralph, W7HSG/AFA9RT
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