The manual provides instructions for converting Hammarlund HQ-110 and HQ-170 receivers to receive the 2.5 MHz WWV frequency, which involves removing certain capacitors and adjusting transformers and capacitors for optimal signal reception. It emphasizes the need for a signal generator and warns that the modification will result in the loss of the 160-meter amateur band.
Manual Overview
The manual for converting Hammarlund HQ-110 and HQ-170 receivers to receive WWV at 2.5 MHz provides detailed instructions for technicians. The conversion process involves sacrificing the 160-meter amateur band and requires specific adjustments. For the HQ-110, technicians should remove capacitor C8, set the dial to 1.9 MHz, and adjust the antenna trimmer. The tuning involves turning the transformer T20’s top oscillator slug counterclockwise until the 2.5 MHz signal is detected, followed by adjusting transformer T16 and peaking capacitor C53 and transformer T7 for maximum signal. For the HQ-170, capacitor C61 must be removed, and technicians should adjust transformer T23’s top oscillator slug counterclockwise. Further adjustments include tuning transformer T19 and peaking capacitor C53 and transformer T12 for optimal signal reception. The manual emphasizes the necessity of a signal generator and warns that the modification is irreversible and requires proper equipment and knowledge.
Quick Issues Covered
- HQ-110: Remove C8, adjust T20, T16, T7 for 2.5MHz signal.
- HQ-170: Remove C61, adjust T23, T19, T12 for 2.5MHz signal.
- Refer to HQ-170 schematic on page 25 for circuit tracing.
Overview
The document provides information on converting Hammarlund HQ-110 and HQ-170 ham band receivers to receive WWV at 2.5 megacycles. The conversion involves sacrificing the 160 meter amateur band and requires specific adjustments to the receivers. It is recommended to have suitable knowledge and equipment, such as a signal generator, to perform the conversion. The document includes detailed steps for making the necessary modifications to each receiver model.
Specifications
Refer to the PDF for details.
Controls & Indicators
Refer to the PDF for details.
Installation / Setup
To convert the Hammarlund HQ-110 and HQ-170 receivers for reception of the WWV signal at 2.5 megacycles, certain modifications are necessary. For the HQ-110, remove capacitor C8, set the dial at 1.9 mc, and adjust the antenna trimmer to the 1/2 mesh position. Tune transformer T20’s top oscillator slug counterclockwise until the 2.5 me signal is heard, then adjust transformer T16 and capacitor C53 for maximum signal. Finally, adjust transformer T7 counterclockwise for maximum signal. For the HQ-170, remove capacitor C61 from the oscillator rack, tune transformer T23’s top oscillator slug counterclockwise until the signal is heard, then adjust transformer T19 and capacitor C53 for maximum signal, followed by peaking the T12 slug. A signal generator is recommended for this procedure, and it is advised to verify the reception capability of the 2.5 me signal in your area beforehand.
Operation
To convert the Hammarlund HQ-110 and HQ-170 receivers for the reception of WWV at 2.5 megacycles, the 160 meter amateur band must be sacrificed. A signal generator is recommended for this procedure. For the HQ-110, remove capacitor C8, set the dial at 1.9 mc, and adjust various components as described to tune to the 2.5 me signal. For the HQ-170, remove capacitor C61, and adjust components similarly to achieve the desired signal reception. This modification does not imply any responsibility from Hammarlund Manufacturing Co.
Troubleshooting & Error Codes
Refer to the PDF for details.
Safety & Warnings
Refer to the PDF for details.
Download 2.5MHZ-SHEET Manual (PDF – 295.5 KB)
Hammarlund HQ-170 Conversion 2.5MHz Sheet: A 295.5 KB PDF guide for technicians to perform frequency conversion adjustments.
- Brand: Hammarlund-hq-170-conversion-wwv
- Model: 2.5MHZ-SHEET
- Type: Manual
- File size: 295.5 KB
Overview
Brief overview of the product.
Specifications
- Key spec 1
- Key spec 2
Controls & Indicators
Control panel/button layout.
Installation / Setup
- Step 1…
- Step 2…
Operation
Basic usage, modes, cycles.
Troubleshooting & Error Codes
| Issue / Code | Fix |
|---|---|
| Example | How to fix… |
Safety & Warnings
- Important warning…
Downloads
Download 2.5MHZ-SHEET manual (PDF)
Hammarlund HQ-170 Conversion WWV 2.5MHz – Device Overview
The Hammarlund HQ-170 Conversion WWV 2.5MHz is a specialized radio receiver designed for precise time signal reception and frequency calibration. This device is primarily used to convert and tune into the WWV time signal broadcast at 2.5 MHz, enabling accurate synchronization of clocks, radios, and other timing-dependent equipment. Renowned for its reliability and precision, the HQ-170 is a valuable tool for radio enthusiasts, technicians, and engineers requiring stable frequency references.
Main Features and Specifications
- Frequency Range: Tuned specifically for 2.5 MHz WWV time signal reception
- High Sensitivity: Capable of receiving weak time signals with minimal noise
- Conversion Capability: Converts incoming WWV signals for easy frequency calibration
- Robust Construction: Durable chassis designed for long-term use in various environments
- Simple Tuning Controls: User-friendly interface for quick and precise adjustments
- Output Options: Compatible with external frequency counters and timing devices
Basic Usage and Operation Tips
To operate the HQ-170 Conversion WWV 2.5MHz, first connect the antenna and ensure it is properly oriented for optimal reception of the WWV signal. Power on the unit and adjust the tuning dial slowly until the WWV signal is clearly received. Use the fine-tuning control to maximize signal clarity and minimize noise. For best results, operate the device in a location free from electrical interference and with a stable power supply. Regularly monitor the output signal to ensure consistent frequency calibration.
Troubleshooting and Maintenance
If the device fails to receive the WWV signal, verify antenna connections and positioning. Check for any nearby sources of electromagnetic interference that may disrupt reception. Inspect the power supply for stability and proper voltage. Periodically clean the tuning dial and connectors to prevent oxidation and ensure smooth operation. If signal distortion persists, consult the manual for detailed circuit checks or consider professional servicing.
Safety Reminder
Always operate the HQ-170 Conversion WWV 2.5MHz in a dry environment and avoid exposure to moisture. Disconnect power before performing any maintenance or inspection. Use only the recommended power sources and avoid modifying the device to prevent electrical hazards. Proper handling and adherence to safety guidelines will ensure safe and reliable operation.
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