Contents:
Heathkit HW-101 and SB-10x Restoration and Troubleshooting...............................1
a)History of the HW-101................................................................................................14
a.1.The SB-series and HW-series (Wikipedia)....................................................................15
a.2.Comparison of Various Models.....................................................................................16
a.3.SB Series vs HW series..................................................................................................16
a.3.1.RF Amp and 1st Receiver Mixer...................................................................................................................17
a.3.2.SB-101/SB-102 LMO Power Source............................................................................................................18
a.3.3.Sideband Bias Circuit...................................................................................................................................18
a.3.4.Accessory Socket......................................................................................................................................... 18
a.3.5.CW Filter....................................................................................................................................................... 18
a.3.6.SB-102 vs. HW-101...................................................................................................................................... 19
a.3.7.Power Supply............................................................................................................................................... 20
b)General Inspection and Restoration Checklist.......................................................21
b.1.Initial Inspection and Cleaning......................................................................................21
b.2.Resistance and Voltage Checks....................................................................................23
b.3.Receiver Alignment........................................................................................................ 24
b.4.Transmit Alignment........................................................................................................ 24
b.5.Meter Checks.................................................................................................................. 24
b.6.Final Checks (optional)..................................................................................................24
c)General Troubleshooting Tips..................................................................................26
c.1.The Unit Appears Completely Dead..............................................................................26
c.2.Does The Unit Receive?.................................................................................................26
c.2.1.Unit Does Not Receive At All........................................................................................................................26
c.2.2.Unit Receives On Some Bands But Not Others...........................................................................................27
c.3.Transmitter Troubleshooting.........................................................................................27
d)Transmit Tuning and Operation................................................................................28
d.1.Initial Transmit Tune-Up.................................................................................................28
d.2.Single Sideband Operation............................................................................................29
d.2.1.PTT Adjustments.......................................................................................................................................... 29
d.2.2.VOX Adjustments.........................................................................................................................................29
d.3.CW Operation.................................................................................................................30
e)Alignment....................................................................................................................32
HW & SB Series Manual Page 3
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