Ramsey Electronics HR40 User Manual

HR40 • 1
40 METER (7.0 MHZ)
ALL MODE RECEIVER KIT
Ramsey Electronics Model No. HR40
Small in size but BIG in features:
• Easily tunes SSB, CW, RTTY and AM
• Smooth varactor tuning of any desired 250KHz segment of the 40
meter band, easily retuned
• Uses the popular SA602 IC chip for outstanding sensitivity and
efficient operation
• Front panel RF Gain, Tuning and Volume controls
• Efficient LM-386 Audio amplifier drives speaker or earphones with a
clean, crisp audio
• Informative manual answers questions on receivers, hookups and
uses - enhances resale value, too!
• Ideal companion to the Ramsey QRP-40 CW Transmitter
• Runs on a standard 9-volt battery
• Clear, concise assembly instructions lead you to a finished product
that works FIRST time!

Ramsey Electronics HR40 Specifications

General

Brand	Ramsey Electronics
Model	HR40
Category	Radio
Language	English

Summary

Introduction to the HR40

Ramsey HR-Series Amateur Receivers

About Direct Conversion Receivers

Circuit Description

Parts Supplied with the HR40 Kit

"Learn-As-You-Build" Assembly Strategy

Parts Layout

Receiver Assembly

Initial Testing of Your HR40

Alignment

Using Your Receiver

Tuning SSB Signals

Guidance on tuning the HR40 for Upper Sideband (USB) and Lower Sideband (LSB) signals.

CW Operation

Explanation of how direct-conversion receivers handle CW signals and the concept of zero-beat.

On the Air Trans-Receiving

Information on using the receiver with a transmitter and potential RF interference issues.

Speaker Operation

More Audio Power - Another Way

Adding an LED Power on Indicator

Troubleshooting Tips

General Notes for Experienced QRP Builders

Alternate Power Sources

Details on operating the HR40 circuitry with voltages from 6 to 14 volts.

Bandspread and Tuning Range

Adjusting oscillator coil for finer tuning and bandspread for specific band segments.

Other Methods of Dial Calibration

Direct Frequency Readout

The LM386 Audio Output

The Ramsey Kit Warranty

Defective Parts

Procedure for reporting and returning defective parts within 90 days of purchase.

Missing Parts

Guidelines for identifying and reporting missing or incorrect parts received in the kit.

Factory Repair of Assembled Kits

Refunds