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 [email protected]
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