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60 Hz hum should be heard coming from the speaker or headphones.
Your Measurements/Observations - ______________________________________________
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Receive/Transmit Keying
[ ]
Install the PN2907A PNP transistor at Q8
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Install resistors R17 and R18
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Install capacitors C14, C20 and C21
Your PCB should look like that shown in the next figure.
Test – Apply 12 volts to the board. Confirm with a DVM or VOM that at least 11.5 volts (+V
Tx) appears at the collector of Q8 (left pad of R86 location) when the "KEY" pads are
connected together.
- Figure 6 -
7
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