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Lists specific changes based on receiver serial numbers for accuracy.
Details corrections for diagrams and parts list for specific receiver models.
Introduces the HQ-140-X as a modern receiver with high performance and features.
Details the tunable frequency range and the receiver's ability to separate signals.
Explains the high sensitivity and the function of the noise limiter for clear reception.
Describes the band spread tuning feature for amateur bands and calibration.
Guides on unpacking, connecting speaker, and antenna for proper setup.
Explains the function of main tuning, volume, and other controls for operation.
Instructions on how to power on the receiver and check for tube warm-up.
Recommended initial settings for controls like Tuning Range, AVC, Sensitivity for different modes.
Guidance on using the "S" meter for accurate tuning and signal strength indication.
Explains the use of BFO for CW and the Limiter for short wave reception.
Describes how to use crystal selectivity for filtering and phasing to reduce interference.
Lists the frequency bands and corresponding wave lengths covered by the receiver.
Step-by-step guide for tuning broadcast and shortwave stations using main and band spread dials.
Explains the antenna input coupling and RF amplifier stage for signal selection.
Details the mixer and local oscillator function for frequency conversion.
Describes the three stages of IF amplification and their contribution to performance.
Explains how the Automatic Volume Control minimizes signal strength variations.
Explains the "S" meter's role in tuning and indicating signal strength.
Steps for re-adjusting the "S" meter pointer if necessary.
Details how the noise limiter reduces impulse noise for better intelligibility.
Explains the BFO's purpose for receiving CW signals and the CW TONE control.
Describes the voltage amplifier and beam power amplifier for audio output.
Explains the stabilized power supply, rectifier, and voltage regulation.
Provides recommendations for antenna types and matching for optimal reception.
Lists the necessary equipment, including oscilloscope and signal generator.
Details the procedure for tuning IF transformers for symmetry and amplitude.
Step-by-step guide for aligning IF transformers using specific settings and adjustments.
Procedure for aligning RF and oscillator stages for dial calibration and tracking.
Explains adjusting the tuning dial and trimmer capacitors for each band.
Procedure for adjusting coils (L17, L12, L6) for maximum response at antenna terminals.
Identifies tube failure and component failure as primary sources of difficulty.
Discusses using voltage charts and schematics for locating defective components.
Lists capacitors with schematic designations and Hammarlund part numbers.
Lists resistors with schematic designations and Hammarlund part numbers.
Lists various antenna and H.F. oscillator coils with their respective part numbers.
Lists resistors with schematic designations, wattage, and Hammarlund part numbers.
Details switches, transformers, and impedance assemblies with part numbers.
Lists other components like crystals and transformers with part numbers.
Lists remaining resistors with schematic designations and Hammarlund part numbers.
Details various assemblies like Crystal Filter, IF, BFO with their part numbers.
The Hammarlund HQ-140-X is a modern, general-purpose, superheterodyne communications receiver designed for high performance and long-term stability. It features a self-contained, stabilized power supply operating from a 50-60 cps, 105-125 volt AC source.
The HQ-140-X is primarily designed for communications use, but also provides good fidelity for music and voice reproduction in standard and shortwave broadcast bands. It incorporates an unusually stable Beat Frequency Oscillator (BFO) for receiving telegraph or code signals. An "S" Meter provides accurate reports on received phone signals, and a Send-Receive switch with relay connections allows for associated transmitter operation without interference. The receiver's high sensitivity and superior Hammarlund noise limiter contribute to an inherently high signal-to-noise ratio, enabling reception of even weak stations. A patented Hammarlund crystal filter offers extreme selectivity for attenuating closely adjacent interfering signals. Automatic Volume Control (AVC) minimizes fading and signal strength variations, maintaining a comfortable and constant audio level. Either headphones or a loudspeaker can be used for audio output.
General| Brand | Hammarlund |
|---|---|
| Model | HQ-140-X |
| Category | Receiver |
| Language | English |
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