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.

• Brand: Hammarlund
• Model: 2.5MHZ-SHEET
• Type: manual
• File size: 295.5 KB

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

1. Step 1…
2. Step 2…

Operation

Basic usage, modes, cycles.

Troubleshooting & Error Codes

Safety & Warnings

• Important warning…

Downloads

Download 2.5MHZ-SHEET manual (PDF)

The manual provides instructions for converting Hammarlund HQ-110 and HQ-170 receivers to receive WWV signals at 2.5 MHz, which involves removing specific capacitors and adjusting transformers and capacitors for optimal signal reception. It advises using a signal generator and checking local signal reception capability before attempting the modification, and notes that the conversion sacrifices the 160-meter amateur band.

• Brand: Hammarlund
• Model: 2.5MHZ-SHEET
• Type: manual
• File size: 295.7 KB

Manual Overview

The manual for converting Hammarlund HQ-110 and HQ-170 receivers to receive the 2.5 MHz WWV signal provides detailed instructions for technicians. The conversion requires sacrificing the 160-meter amateur band and is intended for those with appropriate technical knowledge and equipment, such as a signal generator. For the HQ-110, technicians should remove capacitor C8, adjust the dial to 1.9 MHz, and set the antenna trimmer to half mesh. The T20 transformer’s top oscillator slug is tuned counterclockwise until the 2.5 MHz signal is detected. Further adjustments involve turning the T16 transformer slug to its maximum counterclockwise position and peaking capacitor C53 and transformer T7 for maximum signal. For the HQ-170, capacitor C61 is removed, and the T23 transformer’s top oscillator slug is adjusted similarly. The T19 transformer slug is turned to its maximum counterclockwise position, followed by peaking capacitor C53 and the T12 slug for optimal signal reception. This procedure is straightforward but requires careful attention to component adjustments.

Quick Issues Covered

• HQ-110: Remove C8, adjust T20, T16, T7 for 2.5MHz reception.
• HQ-170: Remove C61, adjust T23, T19, T12 for 2.5MHz reception.
• Refer to HQ-170 schematic on page 25 for circuit tracing.

Overview

The product involves the conversion of Hammarlund HQ-110 and HQ-170 ham band receivers to receive WWV at 2.5 megacycles as a frequency standard and time signal source. The manual provides instructions for this conversion, which requires the removal of certain capacitors and adjustments to transformers and capacitors to tune the receivers to the desired frequency. The conversion sacrifices the 160-meter amateur band and is recommended only for individuals with suitable knowledge and equipment.

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 the reception of WWV at 2.5 megacycles, certain modifications are required. 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’s slug to the maximum counterclockwise position and peak 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 2.5 me signal is heard, adjust transformer T19’s slug to the maximum counterclockwise position, peak capacitor C53 for maximum signal, and then peak T12’s slug for maximum signal. A signal generator is recommended for this modification, and it is advised to verify if the 2.5 me signal can be received in the local area before proceeding.

Operation

The conversion of HQ-110 and HQ-170 receivers for reception of WWV at 2.5 megacycles involves the following steps:

For HQ-110:
1. Remove capacitor C8.
2. Set the dial at 1.9 mc and the antenna trimmer at the 1/2 mesh or vertical position.
3. Tune transformer T20 top oscillator slug counterclockwise until the 2.5 me signal is heard.
4. Turn the slug of transformer T16 to the maximum counterclockwise position.
5. Peak capacitor C53 for maximum signal.
6. Adjust transformer T7 counterclockwise for maximum signal.

For HQ-170:
1. Remove capacitor C61 from the oscillator rack.
2. Tune transformer T23 top oscillator slug counterclockwise until the 2.5 me signal is heard.
3. Turn the slug of T19 top to the maximum counterclockwise position.
4. Peak capacitor C53 for maximum signal.
5. Peak T12 slug for maximum signal.

Troubleshooting & Error Codes

Refer to the PDF for details.

Safety & Warnings

Refer to the PDF for details.

Download 2.5MHZ-SHEET Manual (PDF – 295.7 KB)

Hammarlund HQ-110 2.5MHz Conversion Manual: Guide for technicians to perform frequency conversion and adjustments. PDF size: 295.7 KB.

• Brand: Hammarlund-hq-110-conversion-wwv
• Model: 2.5MHZ-SHEET
• Type: Manual
• File size: 295.7 KB

Overview

Brief overview of the product.

Specifications

• Key spec 1
• Key spec 2

Controls & Indicators

Control panel/button layout.

Installation / Setup

1. Step 1…
2. Step 2…

Operation

Basic usage, modes, cycles.

Troubleshooting & Error Codes

Safety & Warnings

• Important warning…

Downloads

Download 2.5MHZ-SHEET manual (PDF)