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"The standby-side voltage on the coil of K1 (+ side of C21) should be around 16 Volts DC. It will fall to 12 or 13 when the relay is keyed.

This keying circuit should be plenty sensitive, well below a half Watt. If R5 got burned by excessive drive power, that's worth checking. If R5's resistance is too high, that will reduce the keying circuit's sensitivity.

Getting the relay-circuit's power-supply voltage up where it belongs might not fix this, but it's important."

It's good advice as I've seen R5 high in a majority of Hygain Afterburners.

http://www.cbtricks.com/Amp/hygain/afterburner_plus_482/graphics/afterburner-plus_482.pdf

[QUOTE="kopcicle, post: 656647, member: 46722"] "The standby-side voltage on the coil of K1 (+ side of C21) should be around 16 Volts DC. It will fall to 12 or 13 when the relay is keyed. This keying circuit should be plenty sensitive, well below a half Watt. If R5 got burned by excessive drive power, that's worth checking. If R5's resistance is too high, that will reduce the keying circuit's sensitivity. Getting the relay-circuit's power-supply voltage up where it belongs might not fix this, but it's important." It's good advice as I've seen R5 high in a majority of Hygain Afterburners. [URL]http://www.cbtricks.com/Amp/hygain/afterburner_plus_482/graphics/afterburner-plus_482.pdf[/URL] [/QUOTE]

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