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Ramsey Electronics QRP-80 Instruction Manual

80 meter (3.5 mhz) cw transmitter
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80 METER (3.5 MHz)
CW TRANSMITTER
Ramsey Electronics Model No.
THE RAMSEY QRP-80 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
3.579 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!
QRP-80 • 1
QRP-80

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Summary of Contents for Ramsey Electronics QRP-80

  • Page 1 80 METER (3.5 MHz) CW TRANSMITTER Ramsey Electronics Model No. QRP-80 THE RAMSEY QRP-80 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.
  • Page 2 • 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. 80 METER CW TRANSMITTER KIT INSTRUCTION MANUAL Ramsey Electronics publication No.

  • Page 3: Table Of Contents

    KIT ASSEMBLY AND INSTRUCTION MANUAL FOR QRP-80 80 METER CW TRANSMITTER KIT TABLE OF CONTENTS Introduction to the QRP-80 .... 4 Understanding power levels ... 5 Circuit description ......7 Simplified Block diagram ....8 Parts list ......... 9 Schematic Diagram ...... 10 Parts layout diagram ....
  • Page 4 "QRP" refers to transmitter powers under 5 watts. In our manuals for the Ramsey Amateur Band receivers for the 80 and 40 meter bands, which tend to be of interest to many beginners because of available...
  • Page 5 If you're studying this manual before deciding to try this Ramsey "QRP" transmitter project, perhaps the following discussion will be helpful to you. The purpose of this manual is to help you construct this Ramsey Electronics 4- stage, variable-frequency CW transmitter efficiently and successfully, not necessarily to "sell"...
  • Page 6 QRP-80 • 6...
  • Page 7 On the other hand, if you hear a 1000 watt station producing a moderate signal such as S4 or S5, you can reasonably assume that you will not have a lot of luck over that path right now with the theoretical S1 signal level of your QRP QRP-80 • 7...
  • Page 8 "milliwatt" world ARE setting records with "milliwatt" tests. With the world record set in 1970 between Alaska and Oregon on ONE microwatt, think about it this way: your Ramsey QRP transmitter is almost one million times more powerful than the transmitter used in that historic test! WHO SHOULD USE A "QRP"...
  • Page 9 PARTS SUPPLIED WITH QRP-80 TRANSMITTER KIT: CAPACITORS: 100 pF capactitors (marked 100 or 101) (C6) 330pF capacitor (marked 330 or 331) (C2) 470pF capacitor (marked 470 or 471) (C3) .001µF capacitor (marked .001 or 102) (C11) 2200pF capacitors (marked 2200 or 222) (C17,C18) 11 .01µF capacitors (marked .01 or 103 or 10 nf)

  • Page 10: Circuit Description

    There is some wisdom in this view, but that opinion should not make newcomers apprehensive about trying a Ramsey QRP transmitter, IF: 1. This is where your budget is.

  • Page 11: Block Diagram

    BLOCK DIAGRAM: QRP-80 • 11...
  • Page 12 The assembly sequence will follow the circuit flow from key jack to antenna as faithfully as is practical, as part of Ramsey's "Learn-As-You-Build" kit assembly philosophy.
  • Page 13 If necessary, positively identify Q1, the 2N3904 oscillator transistor, and set it aside for later, since Q4 is similar or identical in style. Proceed with the following steps, in order, once you are positive you have selected Q4 as the 221-334 PNP transistor. QRP-80 • 13...

  • Page 14: Schematic Diagram

    QRP-80 SCHEMATIC DIAGRAM: QRP-80 • 14...

  • Page 15: Parts Layout Diagram

    The PC board used in your kit is common to all the QRP transmitters in the Ramsey Kit line. This means that there are some component locations on the PC board that may not be used on your kit. Please be aware of this and install your parts carefully.
  • Page 16 HALFTIME SUGGESTION It won't be too much longer before your Ramsey transmitter is ready for testing and on-the-air operation. It is common for experimental projects to give disappointing results because of inefficient "haywire" hookups as soon as they are completed.

  • Page 17: Initial Tests

    "halftime" instructions, NOW is the time to make proper preparations for testing and using your transmitter. As we suggest in all Ramsey Electronics kit projects, now might also be an excellent time to take a break and then come back to re-check your connections, or have a friend go over them.
  • Page 18 Saying the same thing one more way, we assume you already know that accurate, commercially built RF wattmeters cost much more than what you paid for this Ramsey transmitter kit. Since this solid-state transmitter does not require tuning or adjustments, a periodic power output check-up should suffice.

  • Page 19: Maximizing Rf Power Output

    Any prolonged "parasitic" emissions will also overheat and destroy the components in the Q4 keying circuit. Please remember that modified PC boards are not eligible for factory repair QRP-80 • 19...
  • Page 20 OTHER ENCLOSURE RECOMMENDATIONS: While we believe that the Ramsey enclosure and knob option is a fine value for finishing off your Ramsey receiver or transmitter, we are happy to give you a couple of additional suggestions and our reasons for them. If your first goal is...

  • Page 21: Troubleshooting Guide

    TROUBLESHOOTING GUIDE: To put it as kindly as possible, the operations of Ramsey QRP transmitters have been field-checked to such an extent that we can assure you that the only cause of malfunction will be defective or incorrectly installed components.
  • Page 22 Incorrect orientation of transistors Incorrect installation of diodes Incorrect selection of inductors Incorrect selection of frequency-dependent capacitors QRP-80 • 22...

  • Page 23: Ramsey Kit Warranty

    Notice that this is not a "fine print" warranty. We want you to understand your rights and ours too! All Ramsey kits will work if assembled properly. The very fact that your kit includes this new manual is your assurance that a team of knowledgeable people have field-tested several "copies"...

  • Page 24: Ramsey Electronics, Inc

    80 METER CW TRANSMITTER KIT Quick Reference Page Guide Introduction to the QRP-80 .... 4 QRP-80 Circuit description .... 7 Simplified Block diagram ....8 Parts list ......... 9 Schematic Diagram ...... 10 Parts layout diagram ....11 QRP-80 Assembly instructions ..12 Initial tests ........

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