800 MHz P25 Tone Out Question
Strange question for you all; our local fire dept. tones out on their 800 Mhz P25 system. I know it sounds crazy, but yes, it is true. No, it is not simulcasted or "patched" from a VHF system, just the dept. saving money instead of going with the high dollar Moscad system. Now, the question is this, lets say I take a 996T and tap the DISC to a ST-804A two-tone programmable decoder. The decoder will be used to trigger an aux. device, which is a tone generator. The tone generator has to be amplified to make the "alert" sound trough a speaker. I want to input the alert tone from the generator as well as the scanner "line out" audio to the same source input of an audio amplifer. What do I need to put "in line" of the tone generator output and/or the scanner "line out" to keep the tone genrator from feeding the alert tone into the scanner audio circuit? I would keep them as two different sources into the amplifier, but there is only one source input on the audio amplifier. Thanks in advance for your suggestions!