wyldman
Member
I have tapped a few radios,and I have a few that were already tapped.Some of the radios seem to decode data better than others,so I'm wondering if the taps were done correctly.
Most of the tap info online suggests using a 10K resistor inline,and a few suggest adding a small capacitor between the tap and ground.
I read some stuff in the Wiki about measuring the AC output voltage to determine the correct resistor.Does anyone have any better info regarding output voltage and the correct resistor to choose ? How do I know if I need a cap,and how to select it ?
Also,does anyone know the correct output voltage AFTER the resistor ? If I know this,I can test my tapped units I already have without opening them up to get at the chip.A lot of them are handhelds,and the chip is a PITA to get at.
I have measured a few,at my output jack,and seem to be getting anywhere from 0.1 to as high as 1.0 volts AC on different units.Some of them seem to fluctuate when traffic is heard,or the squelch is open.Which is the correct way to check the output voltage ? Squelch closed,with no signal ? Squelch open ? or when there is traffic on that frequency ?
Most of the tap info online suggests using a 10K resistor inline,and a few suggest adding a small capacitor between the tap and ground.
I read some stuff in the Wiki about measuring the AC output voltage to determine the correct resistor.Does anyone have any better info regarding output voltage and the correct resistor to choose ? How do I know if I need a cap,and how to select it ?
Also,does anyone know the correct output voltage AFTER the resistor ? If I know this,I can test my tapped units I already have without opening them up to get at the chip.A lot of them are handhelds,and the chip is a PITA to get at.
I have measured a few,at my output jack,and seem to be getting anywhere from 0.1 to as high as 1.0 volts AC on different units.Some of them seem to fluctuate when traffic is heard,or the squelch is open.Which is the correct way to check the output voltage ? Squelch closed,with no signal ? Squelch open ? or when there is traffic on that frequency ?
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