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The circuit ground in most CB radios is not the chassis. The negative pin of the DC power socket is connected to the circuit board's ground. Meter's negative lead can go there.

That radio was produced over repeated production changes. Oldest one did not use MOSFETs. Sounds like your radio has one IRF520 driver and one IRF520 final. All of them made since 2007 are built this way.

The positive probe goes to the metal tab surface. Be careful not to 'bridge' that tab to any nearby stuff with the probe.

Choose one sideband mode. Won't matter which. Mike gain at zero, key the mike and see what the DC reading is.

73

[QUOTE="nomadradio, post: 766917, member: 22"] The circuit ground in most CB radios is not the chassis. The negative pin of the DC power socket is connected to the circuit board's ground. Meter's negative lead can go there. That radio was produced over repeated production changes. Oldest one did not use MOSFETs. Sounds like your radio has one IRF520 driver and one IRF520 final. All of them made since 2007 are built this way. The positive probe goes to the metal tab surface. Be careful not to 'bridge' that tab to any nearby stuff with the probe. Choose one sideband mode. Won't matter which. Mike gain at zero, key the mike and see what the DC reading is. 73 [/QUOTE]

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