Look at the calibrator output [ahead of output diode] with an oscilloscope. Use high
input gain and a slow sweep speed. If the upper portion of the sine-wave signal
appears choppy or uneven, the Y201 crystal may be at fault.
After installation of a new crystal [PN 404-43], recheck with oscilloscope.
ah.1.28. HW-101-26: Receiver Recovery Slow
AUGUST 3, 1978
HW-101 BULLETIN NO: SSB TRANSCEIVER HW-101-26
THIS BULLETIN OBSOLETE. REFER TO BULLETIN NO: HW-101-36 DTD OCTOBER
10,1978.
ah.1.29. HW-101-27: Erratic VFO Tuning
JULY 24, 1978
HW-101 BULLETIN NO: SSB TRANSCEIVER HW-101-27
Erratic tuning can be caused by an intermittent electrical contact in the vernier drive of
the tuning capacitor. This causes a change in the ground path from the capacitor
frame. This affects the capacitance and subsequently, the tuning.
To prevent this, solder a heavy gauge wire or braid from the stop stud to a solder lug
under the closest mounting screw. This provides a suitable short ground path from the
capacitor frame to ground.
ah.1.30. HW-101-28: Carrier Nulls with C14 Trimmer Plates Completely Meshed
JULY 24,1978
HW-101 BULLETIN NO: SSB TRANSCEIVER HW-101-28
SEE BULLETIN NO: HW-100-14 DATED JULY 24, 1978.
ah.1.31. HW-101-29: Poor Preselector Tracking
JULY 24, 1978
HW-101 BULLETIN NO: SSB TRANSCEIVER HW-101-29
SEE BULLETIN NO: HW-100-13 DATED JULY 24, 1978.
ah.1.32. HW-101-30: Poor Preselector Tracking
HW-101 BULLETIN NO: HW-101-30
This problem is more noticeable on the 10-meter band. It may be caused by the drive
belt slipping or by one of the variable capacitors not turning due to excessive friction in
its bearings.
HW-101 Service Bulletins Page 143
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