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General| Brand | Heathkit |
|---|---|
| Model | SB-10 Series |
| Category | Transceiver |
| Language | English |
Details the adoption of SSB and Heathkit's entry into transceiver development, influenced by Collins.
Compares the HW and SB series, highlighting differences in cabinets, front panels, and VFOs (LMOs).
Explains the HW series as a cost-reduced version of the SB series with shared components and design elements.
Discusses the use of 6HS6 tubes in the HW-101's RF amplifier and first mixer, and potential substitutions.
Details the different power sources for the SB-101 and SB-102 LMOs.
Explains the similarities and differences in the sideband bias circuit between SB-101 and SB-102.
Notes the presence of an accessory socket on the SB-102 and HW-101, but not the HW-100.
Addresses the SB-100 and HW-100 lacking CW filter hardware, suggesting potential add-ons.
Compares the SB-102 and HW-101, noting differences in appearance, LMO, crystal control, and audio features.
States that SB-100, 101, 102, HW-100, and HW-101 use the same basic circuitry and HP-23/PS-23 power supplies.
Provides a guide for starting restoration, including creating a log, inspecting for damage, and cleaning.
Details performing resistance and voltage checks before applying power for the first time.
Instructs to refer to a specific section for the complete receiver alignment procedure.
Directs users to a specific section for the complete transmitter alignment procedure.
Outlines the verification of correct meter operation in all positions.
Recommends measuring and recording receiver stage gains.
Troubleshooting steps for a unit that appears completely dead, focusing on power issues.
Guidance on troubleshooting receiver issues by first confirming basic receive functionality.
Troubleshooting steps for units that receive on some bands but not others, checking bandswitch and coils.
Tips for troubleshooting transmitter issues after performing the tuning procedure.
Step-by-step procedure for initial transmit tune-up applicable to all modes of operation.
Details adjustments for SSB operation, including PTT and VOX settings.
Procedure for adjusting the MIC/CW LEVEL control for peak deflections on the meter.
Steps for adjusting VOX controls, including sensitivity and delay for proper relay operation.
Instructions for CW operation, including FUNCTION switch settings and keying adjustments.
Procedure for adjusting the METER ZERO control for a zero reading on the panel meter.
Instructions for setting VTVM switches and connecting to check heterodyne oscillator output.
Guides on checking and adjusting heterodyne oscillator output voltage for various band switch positions.
Procedure for IF alignment using the S-Meter as an output indicator and the 100 kHz calibrator.
Details on adjusting driver grid and plate coils in the specified order for maximum S-Meter indication.
Guidance on transmitter alignment, including neutralizing the final amplifiers and setting controls.
Procedure for final heterodyne oscillator alignment, focusing on grid current and band switch positions.
Steps for adjusting the driver neutralizer wire for smooth peaking in RF output.
Procedure for adjusting the LMO frequency shifter for an exact zero beat in LSB mode.
Discusses uneven power output across bands and the 8395-8895 KHz bandpass circuit.
Details the simplest approach to measuring bandpass filter response using RF signal measurements.
Describes using a sweep generator and oscilloscope to visually determine bandpass circuitry response.
Describes measuring signal levels required for given output, split into audio and RF/IF stages.
Checks carrier, LMO, and HFO oscillator frequencies and levels before signal level measurements.
Determines receive audio stage gain by measuring input levels for 500mw audio output.
Measures nominal signal levels required to produce 2 VAC audio at the AF Gain control.
Provides AC signal voltages for microphone connector through VOX circuit for troubleshooting.
Lists transmit levels based on measurements for ballpark figures, not strict specifications.
Explains SNR as a measure of receiver sensitivity and factors affecting it.
Defines SNR as a straightforward measure of receiver sensitivity, despite limitations.
Defines signal-to-noise ratio as the ratio between wanted signal and unwanted background noise.
Discusses how receiver bandwidth and modulation level affect the SNR specification.
Provides typical SNR specifications for HF communications receivers.
Describes how to measure the required signal for a specified signal-to-noise ratio.
Lists the necessary equipment for measuring signal-to-noise ratio.
Provides processes for testing receiver performance metrics like gain and AGC.
Explains how to determine receiver gain, often stated in dB.
Details sensitivity testing based on signal-to-noise ratio specifications.
Defines AGC threshold as the minimum signal level where AGC maintains constant audio output.
Explains AGC figure of merit as the input signal span within a specified limit for audio output change.
Summarizes the relationships between specifications and understanding receiver performance.
Provides measured data on the relationship between AVC voltage and S-meter reading.
Details measuring AVC and S-meter readings using the same setup as SNR measurements.
Documents procedures for removing and replacing the front panel on SB series radios.
Step-by-step instructions for removing the front panel, including knob and component disconnection.
Instructions for reinstalling the front panel, ensuring proper positioning of shafts and components.
Procedure for mounting the dial escutcheon, adapted from the SB-101 Assembly Manual.
Describes the installation, adjustment, and calibration of the dial mechanism for SB series.
Details the installation of the nylon spiral follower mechanism on the dial pointer drive arm.
Instructions for positioning and securing the circular dial onto the LMO shaft.
Troubleshooting steps for excessive drag or periodic force increase when turning the main tuning knob.
Addresses uneven drag or resistance in the main tuning mechanism due to circular dial wobble.
Guidance on replacing a damaged nylon follower that rides in the circular dial's spiral groove.
Troubleshooting and repair for issues with the zero set dial mechanism and pulley.
Details on restoring a broken tuning dial's center hub for smooth operation.
Specifies the diameter of spun aluminum inlays for small and large knobs.
Step-by-step instructions for removing and replacing the PA load capacitor.
Addresses failures in the AC portion of the function switch and potential solutions.
Discusses the difficulty of finding replacement AC switches and potential issues with replacements.
Suggests replacing the AF Gain control with a potentiometer that includes an AC switch.
Describes modifying the function switch by replacing the original AC switch with a micro-switch.
Wiring changes to convert the rig for low-Z headphones, ensuring speaker muting.
Modifications to improve CW sidetone relay action and eliminate audible sidetone when not keyed.
Suggestions for improving transmitter audio quality and drive to the first transmit mixer.
Enhancements to improve receiver strong signal handling and audio quality.
Modifications to increase BFO drive and decrease IF drive to the product detector for better audio.
Addresses potential issues with carrier oscillator placement affecting receive and transmit audio response.
Addresses S-meter zero setting instability caused by heat-related resistance changes.
Discusses replacing the original RCA connector with BNC or SO-239 style connectors.
Details the benefits and installation of a bulkhead mount BNC connector.
Explains replacing the RCA connector with an SO-239 style connector, noting hole enlargement.
Mentions availability of adapters for connecting PL-259 cables to original RCA connectors.
Describes modifying the SB-100 to incorporate the CW/SSB filter switching mechanism.
Details modifications to use an external VFO for split frequency operation, duplicating SB-640 changes.
Presents measurements of Heathkit SB-line crystal filters at 3.395MHz.
Diagram and notes for the SSB Filter 404-200 circuit, including toroid specifications.
Diagram and description of the SSB Filter 404-283 circuit, including a repaired PCB track.
Identifies three (or possibly four) revision levels for the Modulator Printed Circuit Board.
Lists five (or possibly four) revision levels for the IF Printed Circuit Board with component differences.
Lists various revision levels for the Bandpass Printed Circuit Board.
Lists different revision levels for the Audio Printed Circuit Board.
Lists different revision levels for the RF Driver Printed Circuit Board.
Lists different revision levels for the Crystal Switch Board.
Lists different revision levels for the Het Osc, Driver Grid, and Driver Plate Switch Board.
Information on Heathkit LMOs used in SB series equipment, including part numbers and tube types.
Schematic diagram for the Heathkit TRW LMO.
Schematic for LMO Part Number 110-13, used in SB-300 receiver and SB-400 transmitter.
Schematic for LMO Part Number 110-32, used in SB-100 transceiver and SB-401 transmitter.
Schematic for LMO Part Number 110-40, used in SB-101 transceiver and SB-301 receiver.
Schematic diagram for the SB-102 LMO (ver6).
Provides notes and procedures for LMO repair and servicing.
Step-by-step procedure for removing and replacing the LMO.
Guide for repairing tube-type LMOs, addressing frequency 'warble' issues.
Illustrations showing added grounding braid to the LMO assembly.
Procedure for repairing and recalibrating an LMO that has a tuning stop.
A fix for SB-102 LMO stability issues, addressing frequency jumps and mechanical instability.
Guidance on matching Heathkit paint colors, including Sherwin-Williams formulas.
Discusses paint matching options from Wal Mart and other stores for Heath cabinets and front panels.
Details using Krylon spray paint for repainting the Cheyenne's cabinet.
Compendium of service bulletins for the HW-101, SB-100, SB-101, and SB-102 transceivers.
Addresses VFO drift issues with a permanent change to the VFO coil.
Corrects heterodyne oscillator tube failure and inadequate USB-LSB frequency shift.
Describes an improved mounting method for controls to reduce failure rate.
Provides wiring changes to address low output on the 40-meter band.
Details an alternate method for neutralizing the final amplifiers.
Troubleshooting guide for the audio preamplifier and VOX circuit in SB & HW series.
Information on instability and corrective measures for SB & HW series.
Addresses oscillations or low drive issues in the transmitter.
Troubleshooting self-oscillations after installing steel comb brackets.
Modification to R107 to stabilize the S-meter for acceptable drift levels.
Addresses low receiver sensitivity, referencing another bulletin.
Informs about improperly manufactured 6HS6 tubes and available substitutions.
Details changes to germanium diodes for improved reverse-current characteristics.
Provides a modification to improve ALC adjustment.
Addresses issues with zinc-coated switch shields not taking solder and suggests newer shields.
Procedure to reduce side tone level when using headphones.
Troubleshooting transceiver oscillations occurring when the mic is keyed.
Addresses RF choke overheating or neutralization issues on 10/15 meter bands.
Addresses VFO shift issues related to tuning capacitor trimmer alignment.
Discusses low power output, S-meter drift, and pilot lamp current requirements.
Troubleshooting distorted audio, carrier null, or erratic power output in voice mode.
Addresses issues with the relative power meter pegging on 15 and 10 meter bands.
Troubleshooting relays that remain energized after the transmit condition.
Identifies leakage in 6HS6 tubes at V10/V11 as a cause for poor AGC action.
Addresses strong signals occurring at other than 100kHz points from the calibrator.
Notes this bulletin is obsolete and refers to another.
Troubleshooting erratic VFO tuning caused by intermittent electrical contact.
Addresses carrier null issues when C14 trimmer plates are completely meshed.
Addresses poor preselector tracking issues, referencing another bulletin.
Further details on poor preselector tracking, particularly on the 10-meter band.
Addresses loading capacitor turning with plate capacitor rotation, referencing another bulletin.
Addresses relays chattering in VOX mode, referencing another bulletin.
Troubleshoots 'chirping' audio and slow receiver recovery issues.
Addresses ALC meter reading below zero, referencing another bulletin.
Addresses S-meter drift issues, referencing another bulletin.
Addresses poor IF sensitivity, referencing another bulletin.
Addresses slow receiver recovery, referencing another bulletin.
Provides a method to prevent R-940 leads from shorting to ground.
Addresses poor carrier suppression and suggests changing R9 on the modulator board.
Provides information on identifying 6146A tubes and their use in the HW-101.
Troubleshooting noise or static heard from the speaker when the chassis is tapped.
Troubleshooting relay chatter in VOX mode by checking noise and wires.
Addresses 'warble' issues in the VFO assembly when the chassis is tapped.
Checks lugs on chassis for proper folding to avoid shorting capacitors.
Notes that newer 7-pin tube sockets lack a center ground pin.
Guidance on adjusting VFO coils for proper tracking when tracking is incorrect.
Addresses low power output and poor VOX sensitivity, referencing another bulletin.
Addresses driver preselector peaking issues at 7.0 MHZ, referencing another bulletin.
Informs that PEC at V15A is replaced by discrete components in future runs.
Announces the changeover to 6146B final amplifier tubes due to 6146A unavailability.
Addresses R940 overheating by suggesting positioning the resistor away from the shield.
Troubleshooting mode switch operation tripping VOX, suggesting lead dressing or filter installation.
Addresses VFO stopping working at the high end of bands, except LSB.
Highlights the importance of cleaning the SSB/CW filter slide switch.
Provides equipment and procedure for troubleshooting receiver audio.
Checks for open R117 and advises on dressing wires when replacing it.
Addresses low grid drive by suggesting sweep aligning the 8.395-8.895 Mhz bandpass filter.
Troubleshooting relay chatter in VOX mode caused by a pulse at V1B pin 9.
Addresses receiver oscillations occurring with RF Gain and bandswitch changes.
Checks for missing braid wire between driver boards for neutralization reliability.
References an article in CQ Magazine on interfacing the HW-101 with a Drake 2B receiver.
Addresses parasitic oscillations caused by excessive component lead length.
Lists components used to replace PEC at V15A in current HW-101 production.
Suggests changing capacitor C213 to correct short VOX delay.
Addresses load control squeaks with the HW-101-30 mod, suggesting a fiber washer.
Addresses CW sidetone inoperability in units using the phase shift circuit board.
Informs about replacing rotary switch detents with new part numbers.
Addresses inability to zero S meter and suggests changing resistors R104 and R105.
Provides wiring steps for using the HD-15 Phone Patch.
Troubleshoots no power output in USB/LSB, possibly due to an open R915 resistor.
Suggests installing a volume control circuit to reduce sidetone loudness.
Provides a fix for switch detent breakage during installation.
Addresses VOX cycling caused by a spike introduced at the VOX amplifier input.
Checks for an open capacitor in the power supply related to tone and relay chatter.
Troubleshoots continuous keying with a memory keyer, possibly due to a defective 6EA8 tube.
Addresses R940 overheating by changing capacitor voltage ratings.
Details changes to the carrier null control case and installation procedure.
Addresses VFO oscillation issues at the high end of the dial.
Prevents loading shaft slipping by installing nylon and spring washers.
Eliminates driver stage oscillation on 15 meters by bending the neutralizer wire.
Troubleshoots low transmitter output caused by low VFO output.
Addresses preselector capacitor soldering issues due to corrosion.
Suggests replacing non-GE 6AU6 tubes with GE brand tubes for S-meter drift and IF oscillation.
Addresses oscillation on 15 meters due to changed tube sockets without ground posts.
Recommends changing resistors R1, R6, and R7 to higher wattage ratings to prevent failure.
Troubleshoots VOX activating without a mike connected, suspecting a poor ground at the spare phono jack.
Discusses effects of diode leakage on ALC indication and receiver recovery.
Provides an alternate method for neutralizing final amplifiers, with safety notes.
Troubleshooting guide for audio preamplifier and VOX circuit in SB & HW series.
Suggests checks for instability causes like solder joints, loose hardware, and lead dress.
Addresses oscillations or low drive issues, suggesting steel comb brackets and soldering.
Corrects self-oscillations by tightening screws and ensuring proper ground contact.
Modification to R107 to stabilize the S-meter for acceptable drift levels.
Addresses transmitter oscillations when the mic is keyed.
Troubleshoots erratic tuning by replacing fiber washers with metal washers.
Addresses relays remaining energized after transmit, possibly due to a defective V12 tube.
Addresses driver oscillations on 40 meters by removing a capacitor.
Details improvements to switch action through component and hardware changes.
Corrects tuning troubles by changing variable capacitors and PC boards.
Describes a change related to improper tuning on the 40-meter band.
Addresses grounding problems caused by loose rivets at rear phono and final tube sockets.
Corrects meter zeroing issues by respecifying control tolerance or changing R107.
Addresses repeated heterodyne oscillator tube failure by changing resistor R212.
Troubleshooting guide for audio amplifier and VOX circuit in SB & HW series.
Discusses effects of diode leakage on ALC indication and receiver recovery.
Suggests checks for instability causes like solder joints, loose hardware, and lead dress.
Provides an alternate method for neutralizing the final amplifiers, with safety notes.
Addresses oscillations or low drive issues, suggesting steel comb brackets and soldering.
Corrects self-oscillations by tightening screws and ensuring proper ground contact.
Modification to R107 to stabilize the S-meter for acceptable drift levels.
Notes worse sensitivity on higher frequencies and suggests checking diode D907.
Information not yet available for this bulletin.
Troubleshoots erratic tuning by cleaning tuning cap contacts and checking washers.
Addresses relays remaining energized after transmit, with missing information.
Corrects meter zeroing issues by respecifying control tolerance or changing R107.
Addresses repeated heterodyne oscillator tube failure by changing resistor R212.
Relates low grid drive to electrode capacitance differences and suggests alignment changes.
Suggests a cure for LMO instability by modifying mounting hardware.
Provides wiring changes to address low output on the 40-meter band.
Troubleshooting guide for audio preamplifier and VOX circuit in SB & HW series.
Suggests checks for instability causes like solder joints, loose hardware, and lead dress.
Provides an alternate method for neutralizing the final amplifiers, with safety notes.
Addresses oscillations or low drive issues, suggesting steel comb brackets and soldering.
Corrects self-oscillations by tightening screws and ensuring proper ground contact.
Addresses relays remaining energized after transmit, possibly due to a defective V12 tube.
Identifies leakage in 6HS6 tubes at V10/V11 as a cause for poor AGC action.
Addresses strong signals occurring at other than 100kHz points from the calibrator.
Addresses poor preselector tracking, particularly on the 10-meter band.
Addresses carrier null issues when C14 trimmer plates are completely meshed.
Troubleshoots relay chatter in VOX mode, possibly due to a GE tube at V1.
Describes the basic modification to use the HW-101 as a PA, including wiring and jack relabeling.
Details an enhanced modification for more sophisticated T-R switching and receiver routing.
Procedure for tuning the HW-101's final stage when used as a PA.
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