[Elecraft] K3 PTT with DEMI Transverters

[Ken Arck]

Guess I can't attach a pic so here's a URL to it

http://www.ah6le.net/k3_key.jpg

Ken



At 07:46 AM 7/18/2016, Ken Arck wrote:
>Hi Ken
>
>I too use a DEMI xvtr and used the following circuit to exploit the 
>K3's capability to set a logic bit on the ACC connector based on band
>
>Ken
>
>
>
>
>At 09:33 PM 7/17/2016, Ken Kontor via Elecraft wrote:
>>Gentlemen,
>>
>>I am looking for a circuit that one of you K3 users may have 
>>designed to automatically switch the K3 PTT line between multible 
>>external transverters as the K3 is switched from band to band.
>>
>>I presently use the K3 PTT line to key my 6m amp driven with 30 w from my K3.
>>
>>I recently purchased a DEMI 2m HP transverter to drive my 2m 3CX800 
>>amp. The DEMI puts out 50 w with 1 mw of drive from the K3. The 
>>problem I have is when I key the DEMI Transverter from Pin 10 on 
>>the K3 15 Pin accessory socket, the K3 PTT out on the back of the 
>>K3 also Keys my 6m Amp even though the K3 is set to 2m. I need a 
>>circuit that will decode the BCD output from the K3 15 Pin 
>>connector to key the 6m Amp when I am on 6m and automatically 
>>switch the PTT line to the DEMI Transverter when I am on 2m. A 
>>manual switch would be very inconvenient for VHF contesting as one 
>>need to quickly QSY between bands with one station for multiple 
>>points. Also in the future I might add a 432 Transverter and would 
>>like to auto switch  the PTT for it also. I would only require 
>>three outputs as I would only switch between 6m, 2m and 70 cm.
>>
>>I am a Mechanical Engineer with limited Electrical knowledge. I did 
>>build  a K2 and can breadboard stuff from a schematic and parts 
>>list, but I am not a circuit designer and have no knowledge of 
>>digital logic stuff other than I know it exists. I am in need of a 
>>designed and tested circuit that is know to work reliably. Given 
>>the circuit diagram and a parts list I could then reproduce it.
>>
>>Your help is greatly appreciated. Thank you in advance for any 
>>information you can provide.
>>
>>73, Ken - W8KEN
>>
>>
>>PS: you may contact me off line at w8ken at yahoo.com
>>
>>
>>______________________________________________________________
>>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 ken at arcomcontrollers.com
>
>
>------------------------------------------------------------------------------
>President and CTO - Arcom Communications
>Makers of repeater controllers and accessories.
>http://www.arcomcontrollers.com/
>Authorized Dealers for Kenwood and Telewave and
>we offer complete repeater packages!
>AH6LE/R - IRLP Node 3000
>http://www.irlp.net
>"We don't just make 'em. We use 'em!"
>
>
>______________________________________________________________
>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 ken at arcomcontrollers.com

------------------------------------------------------------------------------
President and CTO - Arcom Communications
Makers of repeater controllers and accessories.
http://www.arcomcontrollers.com/
Authorized Dealers for Kenwood and Telewave and
we offer complete repeater packages!
AH6LE/R - IRLP Node 3000
http://www.irlp.net
"We don't just make 'em. We use 'em!"