[Central-Electronics] Central electronics 20A

[Jim Candela]

 Gus,
   The normal method is to use the Operation switch where STDBY and MAN positions are used. Switching to MAN keys the transmitter.
On my 20A I added a relay to key the wire used on the MAN position (must be in MAN), and a extra set of contacts is used as a T/R switch. I added a BNC on the back for the receiver. Also added a 1/4" Mic jack with an extra circuit for the PTT. 

In my case I used a 12v relay, DPDT. I made power with a voltage doubler from the 6.3vac.
Hope this helps.
JimWd5JKO

    On Wednesday, July 29, 2020, 7:06:05 PM CDT, Gustavo Moreno <lu4eeb at hotmail.com> wrote:  
 
 
I wonder if anyone can tell me  how to connect  PTT  in my 20A.  I just finish restoring it , did voltage measurements and is ready for a test.
When  I can figure PTT , I would be  testing with a dummy load for the first time and monitoring my output with an old HF receiver.
Thanks to anyone who can help me.
Gus,
N4GDM


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