Icom: Icom ID-5100/4100/2730 COS output

[WX5812]

Has anyone found where you can tap in for COS in these radios? I found disc. Audio on the NJM2552 (all 3 have that IC). Thought it might be in that to, but nothing is obvious as such.

 

[N0MLP]

Forgive me, but could you explain just a bit what COS is?

 

[WX5812]

Carrier operated squelch or it is sometimes referred as COR Carrier operated relay. It’s a signal that either goes high or low when the radio is receiving.