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Ramsey Electronics QRP40 User Manual

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QRP-40 1
40 METER (7MHz)
CW TRANSMITTER
Ramsey Electronics Model No. QRP40
THE RAMSEY QRP-40 IS AN AMAZING PERFORMER
THAT WILL WORK THE WORLD ON ABOUT A WATT!
FOLKS OF ALL AGES HAVE SUCCESSFULLY BUILT
AND ENJOYED THIS EASY, FUN KIT.
Ideal for portable or travel fun
VCXO design allows up to 5 KHz of tuning about the crystal
frequency
Front panel switching of TWO channels and includes a crystal for
7.040 MHz, the International QRP frequency
Excellent and clean keying waveform
Built-in antenna T-R switch
Operates on 12 - 15 volts DC at 1/4 amp current
Appoximately 1 Watt RF power
Clear, concise step-by-step instructions carefully guide you to a
finished kit that not only works - but you’ll also learn too!
Proven design that has won many of awards for operators around
the country!
Add our case and knob set for a finished ‘Pro’ look. Cases match all
Ramsey products
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Ramsey Electronics QRP40 Specifications

General IconGeneral
BrandRamsey Electronics
ModelQRP40
CategoryTransmitter
LanguageEnglish

Summary

Circuit Description

Block Diagram

Parts Supplied with QRP40 Transmitter Kit

QRP40 Parts Layout Diagram

Learn-As-You-Build Transmitter Assembly Strategy

First Assembly Steps

Initial component installation to establish landmarks on the PCB.

Building the VXO (Variable Crystal Oscillator)

Crystal Oscillator Testing

Further Assembly

Buffer and RF Amplifier Wiring

Instructions for wiring the buffer and final RF amplifier stages.

Initial Tests

Verifying Transmitter RF Output

Maximizing RF Power Output

Troubleshooting Guide

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