Heathkit SB-10 Series Troubleshooting Manual page 34

Set the FUNCTION switch to CAL and the BAND switch to 3.5, then turn the Main
Tuning dial back and forth around 3.7 MHz to get the loudest signal. Check for the
calibrate Signal by turning the FUNCTION switch to VOX and back to CAL; the signal
should stop and then start again and should peak with the DRIVER PRESELECTOR.
Reset the DRIVER PRESELECTOR to the 12 o'clock position.
Disconnect the VTVM leads from the Transceiver.
p.2.2. IF Alignment
The S-Meter will be used as an output indicator during the remaining alignment of the
Transceiver, and the 100 kHz calibrator will be used as a signal source.
a) Adjust transformer T201 for maximum volume.
q) Adjust the top and bottom slugs of transformer T102 for a maximum volume or S
Meter indication.
r) Adjust the slug of transformer TI03 for a maximum S-Meter indication.
s) Repeat the adjustments of transformers T201, TI02, and TI03 for a maximum S-
Meter indication.
s.1.1. Preliminary Driver Grid and Plate Coil Alignment
Important: Due to the way the coils are switched, they coils must be adjusted in the
order listed. The 3.5 coil is in the circuit all the time – the 29, 21, 14, and 7 coils in series
and are progressively switched in parallel with the 3.5 coil. That is, for 21 MHz, the 29
and 21 coil (in series) are switched into parallel with the 3.5 coil.
Alignment Page 34