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80 MTR 20 WATT QRP
LINEAR AMPLIFIER KIT
Ramsey Electronics Model No.
Need a little extra boost for your QRP rig? Believe it or not, 20 watts is only
about an 'S' unit below a 100 watt rig! This nifty little amp will add some
"punch" to any QRP transmitter.
•
Works great with Ramsey QRP rigs or any other 1-2 watt
transmitters
•
Built-in T/R relay automatically switches between receive and
transmit
•
Runs on 12 volts DC at 2 to 4 amps; ideal for field day or battery
operation
•
Multistage low pass filter for a clean signal
•
Operates all modes: CW, SSB, or AM
•
Fast, easy, and fun 2 hour assembly
•
Informative manual answers questions on theory, hook-ups, and
uses - enhances resale value too!
•
Clear, concise assembly instructions carefully guide you to a
finished kit that works the FIRST time!
QAMP-80 • 1
QAMP-80
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Summary of Contents for Ramsey Electronics QAMP-80
- Page 1 80 MTR 20 WATT QRP LINEAR AMPLIFIER KIT Ramsey Electronics Model No. QAMP-80 Need a little extra boost for your QRP rig? Believe it or not, 20 watts is only about an ‘S’ unit below a 100 watt rig! This nifty little amp will add some “punch”...
- Page 2 COPYRIGHT 1994 by Ramsey Electronics, Inc. 793 Canning Parkway, 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.
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Page 3: Table Of Contents
AND INSTRUCTION MANUAL 80 METER QRP CW POWER AMPLIFIER KIT TABLE OF CONTENTS Introduction to the QAMP-80 ..4 How it works ........4 Parts list ......... 5 Tips and notes ....... 6 QAMP-80 assembly instructions ..6 Initial testing ........ 12 Verifying RF output power ... -
Page 4: How It Works
The T-R relay circuit uses a simple diode detector consisting of D2 and D3. The detector output is amplified by transistors Q3 and Q4 to drive relay K1. QAMP-80 • 4... - Page 5 PARTS LIST FOR THE QAMP-80 QRP POWER AMPLIFIER CAPACITORS: [ ] 1 100 to 220 µf electrolytic capacitor [C1] [ ] 1 10 µf electrolytic capacitor [C2] [ ] 4 .1 µf disc capacitor (marked .1 or 104) [C3,8,10,13] 560 ρf disc capacitor (marked 560 or 561) [C4,7] [ ] 2 1200 ρf disc capacitor (marked 1200 or .0012) [C5,6]...
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Page 6: Tips And Notes
Take a look at the parts layout diagram. There is quite a lot to the construction of the QAMP-80. It's easier than it seems once you get going, especially after you have installed a few of the "landmark" components. Once these "landmark"... - Page 7 Both diode D3 and diode D2 are detectors for sensing applied RF power. 13. Install C10, .1 µf disc capacitor (marked .1 or 104). 14. Install R7, 100 K ohm resistor (brown-black-yellow). QAMP-80 • 7...
- Page 8 Insert the resistor into the PC board and hold it carefully while you solder it to the board. 27. Install R8, 100 ohm resistor (brown-black-brown). 28. Install C11, .001 µf disc capacitor (marked .001 or 102). QAMP-80 • 8...
- Page 9 MOSFET power transistors and prepare the leads for insertion into the PC board. Bend down Transistor bend pix the two outside leads about 1/8" from the transistor body and the center lead about 3/16" from the body. QAMP-80 • 9...
- Page 10 6 complete whole turns through the core. Be especially careful not to strip the insulation by pulling too tightly around the core.The amount of wire cut for this task is the proper QAMP-80 • 10...
- Page 11 46. Cut off another length of the same wire, 9½ inches long. Wind 1 turn through the core, loop out 1 inch, twist together and run one more turn through the core. Continue on in the same direction as before. Tin each QAMP-80 • 11...
- Page 12 3. Suitable dummy load and resonant antenna. • 4. QRP transmitter with a power output in the ½ to 2 watt range, such as the Ramsey QRP-80. • 5. Proper cables to interface between the QRP transmitter and the QAMP-80 • 12...
- Page 13 1 to 2 amp current draw and about 10 watts of RF output power. With a solid 13 to 14 volt supply, you can expect about 2 to 3 amps current draw and up to 10 or 12 watts of RF output power. With 2 watts of RF drive, expect QAMP-80 • 13...
- Page 14 "flakey" when tuning up into a light bulb, and by all means you should not consider a light bulb an accurate indicator of the QAMP-80's performance! If ANY light bulb lights up when connected to the antenna jack of this amplifier, you can be satisfied that you have RF output power at least equal to the DC power rating of the bulb you are using.
- Page 15 T1 and then on to the low pass filter. Remember that RF enters and exits through relay contacts on K1. Do the transistors get too hot? Do they get hot without amplifying? Things to QAMP-80 • 15...
- Page 16 Your finished amplifier can be installed in a variety of enclosures of your own design and choosing. You might be planning to combine several Ramsey circuit kit boards in a single enclosure. Use of the inexpensive and attractive Ramsey QAMP-80 • 16...
- Page 17 Ramsey amateur kit board is Radio Shack No. 270-253A. This metal utility cabinet can accommodate both a receiver, transmitter and amplifier board, plus speaker, with room for various refinements you might like to add. PARTS LAYOUT QAMP-80 POWER AMPLIFIER KIT QAMP-80 • 17...
- Page 18 'missing' 10 K parts ("Hum-m-m, I guess the 'red' band really does look orange!") Ramsey Electronics project kits are packed with pride in the USA. If you believe we packed an incorrect part or omitted a part clearly indicated in your assembly manual as supplied with the basic kit by Ramsey, please write or call us with information on the part you need and proof of kit purchase.
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Page 19: Initial Testing
Soldering Iron Holder/Cleaner (RS-64- Price: $5.00 Ramsey Publication No. MQAMP-80 Assembly and Instruction manual for: RAMSEY MODEL NO. QAMP-80 80 METER 20 WATT LINEAR AMPLIFIER KIT RAMSEY ELECTRONICS, INC. 793 Canning Parkway Victor, New York 14564 This Quality Electronics Phone...