How to set the bias

How to set the bias

Siegfried Jackstien, DG9BFC

1. Set both the POTS to minimum current
2. Select Mode as USB. Reduce the MIC to zero.
3. Press the PTT.
4. Without speaking into the microphone, carefully increase the DRIVE_BIAS POT until the current increases by 200 mA. Note the current.
5. Keeping the PTT on the microphone pressed, now increase the PA_BIAS POT until the current increases by another 200 mA.
6. Release the PTT.