Here is a PDF attachment from 73 AMATEUR RADIO TODAY JANUARY 1995 p32, 33
PTT CONTROL FROM RECEIVER AUDIO
The article has a schematic and circuit board diagram for a more sophisticated method to make audio derived switches. You will have to modify a couple of caps for QRQ (c10)
Attachments:
PTT CONTROL FROM RECEIVER AUDIO
The article has a schematic and circuit board diagram for a more sophisticated method to make audio derived switches. You will have to modify a couple of caps for QRQ (c10)
Attachments:
audioDERIVEDinterface.pdf, 1.4 MB
