Superstar 121 Talkback help

[dipd1108]

Does anyone know how to add talkback to a Superstar 121?

 

[sp5it]

Is there any schematic of that radio?

 

[AudioShockwav]

Is there any schematic of that radio?

See Attached File.

73
Jeff

 

[sp5it]

Take audio from R160-C126 Junction and feed to IC4 pin 4 via 1uF cap and 100k potentiometer to set desired level.

 

[dipd1108]

Thanks!

 

[NZ8N]

You forgot to ground the junction of R197 (10k) and D80 (Anode, or non-bar end). This turns the Mute function off when in TX. Can switch on and off this way.

 

[Enterprise312ok]

I have noticed with this mod that the volume controll on the radio changes the volume of the talkback. I wonder if relay talkback will help the situation?