Ramsey Electronics QRP20 manual Ramsey Transmitter Kits

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RAMSEY TRANSMITTER KITS

The “Cube” MicroStation Transmitter

FM25B Synthesized FM Transmitter

FM100B Stereo FM Transmitter

AM1 AM Transmitter

AM25 Synthesized AM Transmitter

RAMSEY RECEIVER KITS

FR1 FM Broadcast Receiver

AR1 Aircraft Band Receiver

SR2 Shortwave Receiver

AA7 Active Antenna

SC1 Shortwave Converter

RAMSEY HOBBY KITS

SG7 Personal Speed Radar

SS70A Speech Scrambler

BS1 “Bullshooter” Digital Voice Storage Unit

AVS10 Automatic Sequential Video Switcher

WCT20 Cable Wizard Cable Tracer

LC1 Inductance-Capacitance Meter

RAMSEY AMATEUR RADIO KITS

DDF1 Doppler Direction Finder

HR Series HF All Mode Receivers

QRP Series HF CW Transmitters

CW7 CW Keyer

CPO3 Code Practice Oscillator

QRP Power Amplifiers

RAMSEY MINI-KITS

Many other kits are available for hobby, school, Scouts and just plain FUN. New kits are always under development. Write or call for our free Ramsey catalog.

20 METER CW TRANSMITTER KIT INSTRUCTION MANUAL

Ramsey Electronics publication No. QRP20 Revision 1.3

First printing: January 1995

COPYRIGHT 1994 by Ramsey Electronics, Inc. 590 Fishers Station Drive, Victor, New York 14564. All rights reserved. No portion of this publication may be copied or duplicated without the written permission of Ramsey Electronics, Inc. Printed in the United States of America.

QRP-20 • 2

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Contents CW Transmitter Ramsey Transmitter Kits QRP20 20 Meter CW Transmitter KIT Introduction Watts vs 1 Watt Understanding the Difference QRP-20 WHO should USE a QRP TRANSMITTER? Circuit DescriptionBlock Diagram Parts Supplied with QRP20 Transmitter KIT CapacitorsQRP-20 QRP20 Parts Layout Diagram LEARN-AS-YOU-BUILD Transmitter Assembly Strategy First Assembly StepsQRP-20 Building the VXO Variable Crystal Oscillator Halftime Suggestion Buffer and RF Amplifier Wiring Crystal Oscillator TestingFurther Assembly Your Power Supply and RF Output Power Initial TestsVerifying Transmitter RF Output Maximizing RF Power Output TRANS-RECEIVE OperationRamsey Electronics CASE, Knob & Hardware Option Other Enclosure RecommendationsTroubleshooting Guide Final ConsiderationsQRP-20 Ramsey Kit Warranty Ramsey Model NO. QRP20 Meter CW Transmitter KIT

QRP20 specifications

The Ramsey Electronics QRP20 is a compact and innovative low-power transceiver designed for amateur radio enthusiasts who appreciate both portability and efficiency in their operations. This QRP (low power) radio is primarily aimed at those who seek to operate on the HF bands, providing an exhilarating experience for operators who thrive on the challenges and satisfaction of making contacts with minimal power output.

One of the standout features of the QRP20 is its compact design. This radio can easily fit into a backpack, making it ideal for field operation, portable use, or emergency communication scenarios. Weighing in at just a few pounds, it’s lightweight enough for extended outings without burdening the operator.

The QRP20 operates on a range of HF bands, specifically covering 20 meters, which is especially popular among amateur radio operators for its relatively consistent propagation and activity level. The transceiver leverages solid-state technology, ensuring reliability and optimizing performance. It can produce an output of up to 5 watts, which is standard for QRP operations, allowing operators to experiment with different antenna configurations and propagation techniques.

Another significant aspect of the QRP20 is its user-friendly interface. The radio features a straightforward layout with well-placed knobs and buttons for efficient tuning and operation. The built-in digital display provides clear visibility of frequency information and operational status, enhancing the overall user experience. In addition, the QRP20 includes a narrow bandwidth filter, which effectively reduces noise and enhances signal clarity, enabling clearer communication even in crowded band conditions.

The QRP20 is equipped with an internal speaker as well as a headphone jack for private listening. It also features a built-in keyer for CW (Continuous Wave) operation, making it versatile for various modes of amateur communication including voice and Morse code.

Powering the QRP20 is effortless, as it can be run off a standard 12V power supply or a rechargeable battery, giving operators flexibility in power sourcing. Whether during portable activations or in a home setup, the QRP20 is adaptable to different operating situations.

In conclusion, the Ramsey Electronics QRP20 is a remarkable choice for amateur radio users who value portability, versatility, and performance. Its efficient design, solid technology, and ease of use make it a compelling addition to any operator's gear, offering a satisfying QRP experience while staying connected with a global community of radio enthusiasts.