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highstupid

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Hi all,

I’m trying to figure out how to wire up my SVR-200 to my XTVA. I’ve got it all figured out except for the COR and TXing wires for the SVR. My question is this: is there a COR output on the XTVA? I’m just gonna tie the ptt and TXing lines together.
 

RFI-EMI-GUY

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The best you can do is pick off DC voltage from the speaker wires and run through an optocoupler.
 

RFI-EMI-GUY

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I was thinking about doing a op amp comparator on the RX audio line and set it to cause COR to go high on audio playback
Nothing that elaborate required.

You might find that the speaker lines from the radio itself rise to 1/2 VCC or about 3.75V when the radio unmutes. That may be enough on its own to drive an optocoupler through a resistor of 1K or more. Use the optocoupler as COR. Or an NPN transistor instead of optocoupler.
 

RFI-EMI-GUY

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You want to detect a 3.75V rise between ground and just one of the speaker leads. Measure with a meter to see if the voltage rises from zero to approx 3.75 referenced to ground. Use a ~ 1K resistor to limit current to the optocoupler.

Why do you have an SVR on an XTVA? Are you leaving a portable in it as a mobile radio?
 

highstupid

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Yep. That’s the plan. I have to reverse the logic for the VRS pin but I’m doing that with a relay so my only issue is COR but I guess you’ve solved it for me. Thanks for the help
 

highstupid

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You want to detect a 3.75V rise between ground and just one of the speaker leads. Measure with a meter to see if the voltage rises from zero to approx 3.75 referenced to ground. Use a ~ 1K resistor to limit current to the optocoupler.

Why do you have an SVR on an XTVA? Are you leaving a portable in it as a mobile radio?

I’m guessing a .6v PtP isn’t enough for a optocoupler so I did a comparator with a potentiometer
 

RFI-EMI-GUY

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You should be measuring a ~ 3.75 DC voltage transition, referenced to ground as the amplifier turns on inside the radio. Not AC PtP....
 

RFI-EMI-GUY

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I’m getting the audio as is from the 25 pin connector

Yeah, it looks like a lot of filtering, DC blocking and buffering between the radio and the power speaker terminals.
Do you have a schematic of the XTVA? You might be able to get the DC signal from J6 pin 2 or pin 7.

ASTRO XTS/Dimetra MTP Portable Radios Vehicular Adapter (XTVA) Instruction Manual Dimetra XTVA & Service 6881088C78 O



1644972071756.png
 
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