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Multiple external inputs to Funke ATR833

PostPosted:Fri Nov 08, 2019 12:22 pm
by MikeW
This radio - like most - has one external audio input.
If I want to have two devices (say traffic warnings and SmartASS) can anyone tell me what's needed to combine the inputs please? Is it just series resistors (like one can do with Sigtronics I/com for example) or does it need caps or even something active?
I ought to know but my memory cells are fading :-(
Thanks.