14
1-8-2, 10 METER ADJUSTMENT
Set the band switch to 28.5 tune the VFO to 750. Set the DRIVER TUNING per the photo above. Preset the
FINAL TUNING in the same manner as you did the DRIVER TUNING. Key the transmitter and advance the
RF LEVEL until you start to see a rise in plate current (on the meter attached to power supply monitor jacks).
Adjust L5 and L15 for max plate current. Tune the FINAL TUNING for max power and observe the plate
current. A plate current dip should occur in coincidence with, or very close to the power output peak. Double
check the peak points on each coil and controls several times until there is no improvement
If you are unsuccessful getting proper power output proceed to 2-2-4 DRIVER/PA TROUBLESHOOTING.
When you have corrected the fault return to this point.
1-8-3, 15 METER ADJUSTMENT
Set the band switch to 21. Set the VFO to 360 Set the DRIVER TUNING per the photo. Repeat the process
used in 1-8-2 adjusting L6 and L16
1-8-4, 20 METER ADJUSTMENT
Set the band switch to 14. Set the VFO to 280 Set the DRIVER TUNING per the photo. Repeat the process
used in 1-8-2 adjusting L7 and L17
1-8-5, 40 METER ADJUSTMENT
Set the band switch to 7. Set the VFO to 230 Set the DRIVER TUNING per the photo. Repeat the process used
in 1-8-2 adjusting L8 and L18
1-8-6, 80 METER ADJUSTMENT
Set the band switch to 3.5. Set the VFO to 900 Set the DRIVER TUNING per the photo. Repeat the process
used in 1-8-2 adjusting L9 and L19
1-9, PA NEUTRALIZATION
Neutralization is the process of nullifying the effect of direct grid to plate coupling of energy via the
interelectrode capacitance between the plate and the grid. This process removes the DC drive and eliminates
any gain factor in the PA. With PA gain eliminated any energy measured on the plate is a result of the plate to
grid capacitive coupling. Our goal is to minimize this energy. It is correct when the PA power out peak and the
PA plate current dip coincide.