[Elecraft] Dual Ptt

[Don Wilhelm]

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
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Elecraft at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to rmcgraw at blomand.net
>>
> 
> 
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to donwilh at embarqmail.com