Ramsey Electronics QRP-80 Instruction Manual

QAMP-80 • 1 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

QAMP-80 • 10 We're almost finished. All we need to do now is install a few remaining parts that have to be handmade - for that "old-world c

QAMP-80 • 11 amount. If you have too little or too much, then you have not wound the core correctly. Tin each end with solder as before. Tin

QAMP-80 • 12 end with solder all the way up to the core body. This winding is the 2 turn center-tapped primary of T1.  47. Locate th

QAMP-80 • 13 QRP power amplifier. With the above all set up and handy, let's get testing!  1. Rotate Bias pot R4 fully CCW.  2. C

QAMP-80 • 14 up to 20 watts RF output! VERIFYING TRANSMITTER RF OUTPUT The most important thing to know is whether your transmitter is delivering so

QAMP-80 • 15 KB4ZGC on how to make a highly accurate yet inexpensive dummy load and wattmeter capable of showing 1/10-watt differences in RF power. If

QAMP-80 • 16 check are the bias circuitry and RF path through the relay. The amplifier should draw about ¼ amp with no signal applied. If you see mor

QAMP-80 • 17 case and hardware set will give your unit that nice finished look and increase its resale value. These sturdy black instrument cases are

QAMP-80 • 18 Amateur radio magazines and handbooks provide a variety of circuits for RF wattmeters and relative field-strength indicators, including

QAMP-80 • 19 QAMP-80 20 WATT LINEAR AMPLIFIER Quick Reference Page Guide Introduction to the QAMP-80 ...4 How it works ...

QAMP-80 • 2 RAMSEY TRANSMITTER KITS • FM-10, FM-25A FM Stereo Transmitters • FM-1,2,4 FM Wireless Microphones • PB-1 Telepho

QAMP-80 • 3 Ramsey Publication No. MQAMP-80 Price $5.00 TABLE OF CONTENTS Introduction to the QAMP-80 .

QAMP-80 • 4 INTRODUCTION The Ramsey QAMP series of QRP power amplifiers are compact 10 to 20 watt RF amplifiers for QRP CW transmitters. These amp

QAMP-80 • 5 PARTS LIST FOR THE QAMP-80 QRP POWER AMPLIFIER CAPACITORS: [ ] 1 100 to 220 µf electrolytic capacitor [C1] [ ] 1 10

QAMP-80 • 6 "THE RAMSEY LEARN-AS-YOU-BUILD ASSEMBLY STRATEGY" Take a look at the parts layout diagram. There is quite a lot to the const

QAMP-80 • 7 • Insert the part, oriented correctly, into its correct holes in the PC board. • If helpful, gently bend the part’s wire leads or tabs to

QAMP-80 • 8  16. Install diode D4, 1N4002 style black epoxy diode. Check positioning of the banded end.  17. Install jumper JMP2. Use a p

QAMP-80 • 9  29. Install R9, another 100 ohm resistor (brown-black-brown).  30. Install C12, another .001 µf disc capacitor (marked .001 or 102).