How to set the bias
Siegfried Jackstien, DG9BFC
- Set both the POTS to minimum current
- Select Mode as USB. Reduce the MIC to zero.
- Press the PTT.
- Without speaking into the microphone, carefully increase the DRIVE_BIAS POT until the current increases by 200 mA. Note the current.
- Keeping the PTT on the microphone pressed, now increase the PA_BIAS POT until the current increases by another 200 mA.
- Release the PTT.