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Heathkit Manuals
Transceiver
SB-101
Troubleshooting manual
Heathkit SB-101 Troubleshooting Manual
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Heathkit HW-101 and SB-10X Restoration and Troubleshooting
Table of Contents
A)History of the HW-101
A.1.The SB-Series and HW-Series (Wikipedia)
A.2.Comparison of Various Models
A.3.Sb Series Vs HW Series
A.3.1.Rf Amp and 1St Receiver Mixer
A.3.2.Sb-101/SB-102 LMO Power Source
A.3.3.Sideband Bias Circuit
A.3.4.Accessory Socket
A.3.5.Cw Filter
A.3.6.Sb-102 Vs. HW-101
A.3.7.Power Supply
B)General Inspection and Restoration Checklist
B.1.Initial Inspection and Cleaning
B.2.Resistance and Voltage Checks
B.3.Receiver Alignment
B.4.Transmit Alignment
B.5.Meter Checks
B.6.Final Checks (Optional)
C)General Troubleshooting Tips
C.1.The Unit Appears Completely Dead
C.2.Does the Unit Receive
C.2.1.Unit Does Not Receive at All
C.2.2.Unit Receives on some Bands but Not Others
C.3.Transmitter Troubleshooting
D)Transmit Tuning and Operation
D.1.Initial Transmit Tune-Up
D.2.Single Sideband Operation
D.2.1.Ptt Adjustments
D.2.2.Vox Adjustments
D.3.Cw Operation
E)Alignment
S.2.1.Final Heterodyne Oscillator Alignment
S.2.2.Driver Neutralization Adjustment
S.3.Lmo Shifter Adjustment
T)Uneven Response Across the Band / Bandpass Filter
To 8895 Khz Bandpass Filter
T.1.1.Measuring the Bandpass Filter Response (Simple Method)
T.1.2.Measuring the Bandpass Filter Response (Sweep Analysis)
U)Signal Level Measurements
U.1.Receive Signal Levels
U.1.1.Carrier and Heterodyne Oscillator Levels
U.1.2.Receive Audio Signal Levels
Levels)
V)Using an Audio Signal Generator at 1 Khz, Connect the Generator to the Top of the AF Gain Control and Adjust the AF Gain Control to Provide 500 Mw Audio Output
V.1.1.Receive RF and if Signal Levels
V.2.Transmit Signal Levels
V.2.1.Transmit and VOX Audio Level Troubleshooting Guide
V.2.2.Transmit RF Signal Levels
W)Signal to Noise Ratio (SNR)
W.1.Signal to Noise Ratio (Theory)
W.1.1.Concept of Signal to Noise Ratio SNR
W.1.2.Signal to Noise Ratio
W.1.3.Effect of Bandwidth on SNR
W.1.4.Signal to Noise Ratio Specifications
W.2.Measuring Signal to Noise Ratio (SNR)
W.2.1.Required Equipment
W.2.2.Test Setup
W.2.3.Test Methodology
X)Testing Gain, S+N/N, AGC Threshold and Figure of Merit
X.1.Testing
X.1.1.Receiver Gain
S+N)/N Testing
X.1.3.Agc Threshold
X.1.4.Agc Figure of Merit
X.2.Summation
Y)Heathkit "S" Meter Circuit
Y.1."S" Meter Vs. AVC Voltage
Y.2.Avc and "S" Meter Calibration
Z)Servicing Procedures
Z.1.Front Panel Remove and Replace
Z.1.1.Front Panel Removal
Z.1.2.Front Panel Installation
After the Panel Is Installed
After the Panel Is in Place
A)During this Procedure, be Especially Careful Not to Place too Much Pressure on the Main Tuning Dial
B)During this Procedure, be Especially Careful Not to Place too Much Pressure on the Zero Set Shaft
Z.2.Front Panel Escutcheon Mounting
Z.3.Sb Series Dial Mechanism
Z.3.1.Installation of the Spiral Groove Follower Mechanism
Z.3.2.Installation of Circular Dial on LMO Shaft
Down. Retighten the Screws
Drive Arm Base up or Down. Retighten the Screws
Pointer Is at the "5" Marking. Retighten the Screws
The Dial Pointer Is at the "5" Marking. Retighten the Screws
Ab.1.1.Dial Calibration
Ab.1.2.Re-Engaging the Main Tuning Pulley
Ab.1.3.Drag When Rotating Main Tuning Knob
Ab.1.4.Circular Dial Wobble
Ab.1.5.Spiral Groove Nylon Follower Replacement
Ab.1.6.Zero Set Dial Mechanism and Pulley
Ab.1.7.Repairing the Center Hub
Ab.2.Knob Inlays
Ab.3.Pa Load Capacitor Remove and Replace
Ab.4.Function Switch (A.C. Switch)
Ab.4.1.Finding a Replacement AC Switch
Ab.4.2.Replacing the AF Gain with a Control Having an AC Switch
Ab.4.3.Modifying the Failed Switch with a Microswitch
Ac)Modifications
Ac.1.Conversion to Low-Z Headphones
Ac.2.Improved CW Operation
Ac.3.Transmit Improvements
Ac.4.Receive Improvements
Ac.5.Bfo Level to Product Detector
Ac.6.I.f. Filter Passband Improvements
Ac.7.Stabilizing Meter Zero Settings
Ac.8.Antenna Connector
Ac.8.1.Bnc Connector
Ac.8.2.So-239 Connector
Ac.8.3.So-239 to RCA Male Adapter
Ac.9.Sb-100 CW Filter Modification
Ac.10.Using an External VFO for Split Frequency Operation
Ad)Heathkit Filters
Ad.1. Heathkit Filter Measurements
Ad.2.Ssb Filter 404-200 Circuit
Ad.3.Ssb Filter 404-283 Circuit
Ae)Printed Circuit Boards (Pcbs)
Ae.1.Modulator Printed Circuit Board 85-127-X
Ae.1.1.85-127P221 (SB-100, SB-101)
Ae.2.If Printed Circuit Board 85-128-X
Ae.3.Bandpass Printed Circuit Board 85-129-X
Ae.3.1.85-129P223 (SB-100)
Ae.4.Audio Printed Circuit Board 85-130-X
Ae.4.1.85-130P224 (SB-100, SB-101)
Ae.5.Rf Driver Printed Circuit Board 85-131-X
Ae.6.Crystal Switch Board 85-132-X
Ae.7.Het Osc, Driver Grid, and Driver Plate Switch Board 85-133-X
Af)Heathkit Linear Master Oscillators (Lmos)
Af.1.Lmo Part Numbers & Usage
Af.1.1.Heathkit TRW LMO
Af.1.2.Lmo Part Number 110-13
Af.1.3.Lmo Part Number 110-32
Af.1.4.Lmo Part Number 110-40
Af.1.5.Sb-102 LMO (Ver6)
Af.2.Lmo Repair and Service Notes
Af.2.1.Lmo Remove and Replace
Af.2.2.Heath Tube-Type LMO Repair
Af.2.3.Photos Showing Added Grounding Braid
Af.2.4.Repairing and Recalibrating a Stuck LMO
Af.2.5.Heathkit SB-102 Transceiver LMO Stability Fix
Ag)Matching Heathkit Paint
Ag.1.1.Matching Heathkit Paint: Part 1
Ag.1.2.Matching Heathkit Paint: Part 2
Ag.1.3.Matching Heathkit Paint: Part 3
Ah)Hw-101 and SB-10X Service Bulletins
Ah.1.Hw-101 Service Bulletins
Ah.1.1.Hw-101-1: VFO Drift
Ah.1.2.Hw-101-2: Repeated Heterodyne Oscillator Tube Failure Inadequate USB-LSB Frequency Shift
Ah.1.3.Hw-101-3: Carrier Null Control Failure
Ah.1.4.Hw-101-4: Low Output on 40 Meters
Ah.1.5.Hw-101-4: Low Output on 40 Meters
Ah.1.6.Hw-101-5: Alternate Method of Neutralizing the Final Amplifiers
Ah.1.7.Hw-101-5: Alternate Method of Neutralizing the Final Amplifiers
Ah.1.8.Hw-101-6: SB & HW Series Audio Preamplifier & VOX Circuit Troubleshooting Guide
Ah.1.9.Hw-101-7: SB & HW Series Instability & Corrective Information
Ah.1.10.Hw-101-8: Oscillations or Low Drive
Ah.1.11.Hw-101-9: Self Oscillations Occurring after Installation of Steel Comb Brackets
Ah.1.12.Hw-101-10: S-Meter Drift
Ah.1.13.Hw-101-11: Low Receiver Sensitivity
Ah.1.14.Hw-101-12: Improperly Manufactured 6HS6 Tubes
Ah.1.15.Hw-101-13: Germanium Diode Change
Ah.1.16.Hw-101-14: Improve ALC Adjustment
Ah.1.17.Hw-101-15: Driver and Mixer Switch Shields will Not Take Solder
Ah.1.18.Hw-101-16: Side Tone too Loud
Ah.1.19.Hw-101-17: Transceiver Oscillates in Transmit with the MIC Keyed
Bands
Ah.1.21.Hw-101-16: VFO Shift
Ah.1.22.Hw-101-20: Low Power Output, S-Meter Drift, Etc
Ah.1.23.Hw-101-21: Distorted Audio, no Carrier Null or Erratic Power Output in Voice Mode
Ah.1.24.Hw-101-22: Relative Power Meter Pegs on 15 and 10 Meter
Ah.1.25.Hw-101-23: Relays Remain Energized after Transmit Condition
Ah.1.26.Hw-101-24: Poor AGC Action
Ah.1.27.Hw-101-25: 100 Khz Calibrator Spurs
Ah.1.28.Hw-101-26: Receiver Recovery Slow
Ah.1.29.Hw-101-27: Erratic VFO Tuning
Ah.1.30.Hw-101-28: Carrier Nulls with C14 Trimmer Plates Completely Meshed
Ah.1.31.Hw-101-29: Poor Preselector Tracking
Ah.1.32.Hw-101-30: Poor Preselector Tracking
Ah.1.33.Hw-101-30: Loading Capacitor Turns as Plate Capacitor Is Rotated
Ah.1.34.Hw-101-30: Loading Capacitor Turns as Plate Capacitor Is Rotated
Ah.1.35.Hw-101-31: Relays Chatter in VOX Mode
Ah.1.36.Hw-101-32: "Chirping" and Slow Receiver Recovery
Ah.1.37.Hw-101-33: ALC Meter Reads below Zero
Ah.1.38.Hw-101-34: S Meter Drift
Ah.1.39.Hw-101-35: Poor if Sensitivity
Ah.1.40.Hw-101-36: Receiver Recovery Slow
Ah.1.41.Hw-101-37: R-940 Shorting to Shield
Ah.1.42.Hw-101-38: Poor Carrier Suppression
Ah.1.43.Hw-101-39: Identification of the 6146A Tubes
Ah.1.44.Hw-101-40: Noise or Static from Speaker When Chassis Tapped Lightly
Ah.1.45.Hw-101-41: Relay Chatter in any Setting of the VOX Sensitivity Control
Ah.1.46.Hw-101-42: Unit "Warbles" When Chassis Is Tapped
Ah.1.47.Hw-101-43: Poor Sensitivity or Grid or Plate Driver Coils will Not Tune
Ah.1.48.Hw-101-44: no Ground Pin on Tube Sockets at V10 and V11
Ah.1.49.Hw-101-45: VFO will Not Adjust Properly
Ah.1.50.Hw-101-46: Low Power Output; Poor VOX Sensitivity
Ah.1.51.Hw-101-47: Driver Preselector Won't Peak for Full Output at 7.0 MHZ
Ah.1.52.Hw-101-48: PEC [PN 84-22] no Longer Used
Ah.1.53.Hw-101-49: Changeover to 6146B Finals
Ah.1.54.Hw-101-50: R940 Overheats
Ah.1.55.Hw-101-51: Operation of Mode Switch Trips VOX
Ah.1.56.Hw-101-52: VFO Stops Working at High End of All Bands
Ah.1.57.Hw-101-53: Low Transmitter Output; Low Receiver Sensitivity
Ah.1.58.Hw-101-54: Receiver Audio Troubleshooting Information
Ah.1.59.Hw-101-55: AVC Decay too Fast; S Meter Drops too Quickly
Ah.1.60.Hw-101-56: Low Grid Drive on Certain Portions of One or more Bands
Ah.1.61.Hw-101-57: Relay Chatter in VOX Mode
Ah.1.62.Hw-101-58: Receiver Oscillations
Ah.1.63.Hw-101-59: Finals will Not Neutralize; C913 at Maximum Capacity
Ah.1.64.Hw-101-60: RF Mod in CQ Magazine
Ah.1.65.Hw-101-61: Parasitic Oscillations
Ah.1.66.Hw-101-62: Phase Shift Circuit Board Parts List
Ah.1.67.Hw-101-63: VOX Delay too Short
Ah.1.68.Hw-101-64: Load Control Squeaks with the HW-101-30 Mod Installed
Ah.1.69.Hw-101-65: CW Sidetone Inoperative
Ah.1.70.Hw-101-66: Rotary Switch Detent Change
Ah.1.71.Hw-101-67: Cannot Zero S Meter with the Meter Zero Control
Ah.1.72.Hw-101-68: Wiring for Use with the HD-15 Phone Patch
Ah.1.73.Hw-101-69: no Power Output in USB or LSB; Tune Okay
Ah.1.74.Hw-101-70: Sidetone Is too Loud
Ah.1.75.Hw-101-71: the #266-1116 Switch Detent Breaks During Installation
Ah.1.76.Hw-101-72: VOX Cycling
Ah.1.77.Hw-101-73: Tone in Audio When Switch to CW; Relay Chatters When Key Is Closed
Ah.1.78.Hw-101-74: Keys Continuously When Used with the SA-5010 Memory Keyer
Ah.1.79.Hw-101-75: R940 Overheats
Ah.1.80.Hw-101-76: Carrier Null Control Installation Change
Ah.1.81.Hw-101-77: VFO Stops Oscillating at High End of Dial
Ah.1.82.Hw-101-78: Tune Control Slips
Ah.1.83.Hw-101-79: Driver Stage Oscillates on 15 Meters
Ah.1.84.Hw-101-80: Low Transmitter Output Due to Low VFO Output
Ah.1.85.Hw-101-81: Preselector Capacitors Won't Take Solder
Ah.1.86.Hw-101-82: S Meter Drifts; if Oscillates
Ah.1.87.Hw-101-83: Oscillation on 15 Meters
Ah.1.88.Hw-101-84: R1, R6 and R7 out of Tolerance or Open
Ah.1.89.Hw-101-85: VOX Activates When Mike Not Connected
Ah.2.Sb-100 Service Bulletins
Ah.2.1.Sb-100-1: Diode Leakage in the SB-100, SB-101, HW-100
Ah.2.2.Sb-100-2: Alternate Method of Neutralizing the Final Amplifiers
Ah.2.3.Sb-100-3: SB & HW Series Audio Preamplifier & VOX Circuit Trouble Shooting Guide
Ah.2.4.Sb-100-4: SB & HW Series Instability and Corrective Information
Ah.2.5.Sb-100-5: Oscillations or Low Drive
Ah.2.6.Sb-100-6: Self Oscillations Occurring after Installation of Steel Comb Brackets
Ah.2.7.Sb-100-7: S-Meter Drift
Ah.2.8.Sb-100-8: Transmitter Oscillates in Transmit with the MIC Keyed
Ah.2.9.Sb-100-9: Tuning Erratic
Ah.2.10.Sb-100-10: Relays Remain Energized after Transmit Condition
Ah.3.Sb-101 Service Bulletins
Ah.3.1.Sb-101-1D: Driver Oscillates on 40 Meters
Ah.3.2.Sb-101-2D: Switch Action Improvement
Ah.3.3.Sb-101-3D: Improper Tuning
Ah.3.4.Sb-101-4D: Improper Tuning on 40Meters
Ah.3.5.Sb-101-5D: Grounding Problems on Transceivers
Ah.3.6.Sb-101-1: Meter Zeroing
Ah.3.7.Sb-101-2: Repeated Heterodyne Oscillator Failure
Ah.3.8.Sb-101-3: SB & HW Series Audio Amplifier & VOX Circuit Trouble Shooting Guide
Ah.3.9.Sb-101-4: Diode Leakage in the SB-100, SB-101, HW-101
Ah.3.10.Sb-101-5: SB & HW Series Instability & Corrective Information
Ah.3.11.Sb-101-6: Alternate Method of Neutralizing the Final Amplifiers
Ah.3.12.Sb-101-7: Oscillations or Low Drive
Ah.3.13.Sb-101-8: Self Oscillations Occurring after Installation of Steel Comb Brackets
Ah.3.14.Sb-101-9: S-Meter Drift
Ah.3.15.Sb-101-10: Low Receiver Sensitivity
Ah.3.16.Sb-101-11: Transceiver Oscillates in Transmit with MIC Keyed
Ah.3.17.Sb-101-12: Tuning Erratic
Ah.3.18.Sb-101-13: Relays Remain Energized after Transmit Condition
Ah.4.Sb-102 Service Bulletins
Ah.4.1.Sb-102-1: Meter Zeroing
Ah.4.2.Sb-102-2: Repeated Heterodyne Oscillator Tube Failure
Ah.4.3.Sb-102-3: Low Grid Drive - Alignment Problems
Ah.4.4.Sb-102-4: LMO Instability
Ah.4.5.Sb-102-5: Low 40 Meter Output
Ah.4.6.Sb-102-6: SB & HW Series Audio Preamplifier & VOX Circuit Trouble Shooting Guide
Ah.4.7.Sb-102-7: SB & HW Series Instability & Corrective Information
Ah.4.8.Sb-102-8: Alternate Method of Neutralizing the Final Amplifiers
Ah.4.9.Sb-102-9: Oscillations or Low Drive
Ah.4.10.Sb-102-10: Self Oscillations Occurring after Installation of Steel Comb Brackets
Ah.4.11.Sb-102-14: Relays Remain Energized after Transmit Condition
Ah.4.12.Sb-102-15: Poor AGC Action
Ah.4.13.Sb-102-16: 100KHZ Calibrator Spurs
Ah.4.14.Sb-102-17: Poor Preselector Tracking
Ah.4.15.Sb-102-18: Carrier Nulls with C14 Trimmer Plates Completely Meshed
Ah.4.16.Sb-102-19: Relays Chatter in VOX Mode
Ai)Using an HW-101 as a 100-Watt PA
Ai.1.The Basic Mod
Ai.2.The Enhanced Mod
Ai.3.Adjustment
Aj)Tube Substitutes
Ak)Tube Test Data
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Heathkit Hw-101 and Sb-10X Restoration and Troubleshooting
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Heathkit HW-101
and SB-10x
Restoration and
Troubleshooting
Revised December 17, 2021
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Table of Contents
Troubleshooting
Heathkit HW-101 and SB-10x Restoration and Troubleshooting
1
c)General Troubleshooting Tips
26
c.2.2.Unit Receives On Some Bands But Not Others
27
v.2.Transmit Signal Levels
49
ah.1.8.HW-101-6: SB & HW Series Audio Preamplifier & VOX Circuit Troubleshooting Guide
138
ah.1.56.HW-101-52: VFO Stops Working at High End of All Bands
149
ah.2.3.SB-100-3: SB & HW Series Audio Preamplifier & VOX Circuit Trouble Shooting Guide
162
ah.3.8.SB-101-3: SB & HW Series Audio Amplifier & VOX Circuit Trouble Shooting Guide
169
ah.4.6.SB-102-6: SB & HW Series Audio Preamplifier & VOX Circuit Trouble Shooting Guide
177
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