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K3 PTT with DEMI Transverters

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K3 PTT with DEMI Transverters

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 [hidden email]

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Ken Arck

Re: K3 PTT with DEMI Transverters

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 [hidden email]
>
>
>______________________________________________________________
>Elecraft mailing list
>Home: http://mailman.qth.net/mailman/listinfo/elecraft
>Help: http://mailman.qth.net/mmfaq.htm
>Post: mailto:[hidden email]
>
>This list hosted by: http://www.qsl.net
>Please help support this email list: http://www.qsl.net/donate.html
>Message delivered to [hidden email]

------------------------------------------------------------------------------
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:[hidden email]

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Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]

Ken Arck

Re: K3 PTT with DEMI Transverters

In reply to this post by Elecraft mailing list

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 [hidden email]
>>
>>
>>______________________________________________________________
>>Elecraft mailing list
>>Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>Help: http://mailman.qth.net/mmfaq.htm
>>Post: mailto:[hidden email]
>>
>>This list hosted by: http://www.qsl.net
>>Please help support this email list: http://www.qsl.net/donate.html
>>Message delivered to [hidden email]
>
>
>------------------------------------------------------------------------------
>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:[hidden email]
>
>This list hosted by: http://www.qsl.net
>Please help support this email list: http://www.qsl.net/donate.html
>Message delivered to [hidden email]