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30 METER (10MHz)
CW TRANSMITTER
Ramsey Electronics Model No.
THE RAMSEY QRP30 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 - 8 KHz of tuning about the crystal
frequency
•
Front panel switching of TWO channels and includes a crystal for
10.108 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
QRP30 • 1
QRP30
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Summary of Contents for Ramsey Electronics QRP30
- Page 1 30 METER (10MHz) CW TRANSMITTER Ramsey Electronics Model No. QRP30 THE RAMSEY QRP30 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 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. 30 METER CW TRANSMITTER KIT INSTRUCTION MANUAL Ramsey Electronics publication No. QRP30 Revision 1.3 First printing: January 1995 COPYRIGHT 1994 by Ramsey Electronics, Inc.
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Page 3: Table Of Contents
KIT ASSEMBLY AND INSTRUCTION MANUAL FOR QRP30 30 METER CW TRANSMITTER KIT TABLE OF CONTENTS Introduction to the QRP30 ..... 4 Understanding power levels ... 5 Circuit description ......8 Simplified Block diagram ....8 Parts list ......... 9 Schematic Diagram ...... 10 Parts layout diagram .... -
Page 4: Introduction
For equipment description and contest competition purposes, "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... -
Page 5: Understanding Power Levels
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 enthusiasts will confirm that getting a solid 579 running 3-4 watts is no big deal. If all the above theoretical signal reports are based on both the transmitting and receiving stations using simple dipole antennas, we can also see that the QRP30 • 6...
- Page 7 "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"...
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Page 8: Circuit Description
R13 permits D2 to conduct from the antenna jack to the receiver jack. The buffer and amplifier stages are not keyed, resulting in clean keying, free of chirps and clicks. BLOCK DIAGRAM: C17.L5,C18 D1,D2 BUFFER FINAL LOW PASS DIODE OSC. SWITCH FILTER QRP30 • 8... -
Page 9: Parts List
PARTS SUPPLIED WITH QRP30 TRANSMITTER KIT: CAPACITORS: 47 pf capacitor (C2,C6) 220 pf capacitor (marked 220 or 221) (C17) 470 pf capacitor (marked 470 or 471) (C3,C18) 11 .01 uf capacitors (marked .01 or 103 or 10 nf)(C1,4,5,7,8,9,10,13,14,15,19) 100 to 220 uf electrolytic capacitor (C16) -
Page 10: Schematic Diagram
QRP30 • 10... -
Page 11: Parts Layout Diagram
QRP30 PARTS LAYOUT DIAGRAM: QRP30 • 11... -
Page 12: Assembly Instructions
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. QRP30 • 13...
- Page 14 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 15 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.
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Page 16: Crystal Oscillator Testing
42. Install C8, .01 uf (marked .01 or 103 or 10 nf). 43 Install Q2, marked 2N3053. Observe the case of transistor Q3. The small metal case tab must be oriented correctly! Please be careful. 44. Install R9, 100 ohms (brown-black-brown). 45. Install L2, 100 uh (brown-black-brown-silver). QRP30 • 16... -
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.
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Page 19: Maximizing Rf Power Output
Q4 keying circuit. Please remember that modified PC boards are not eligible for factory repair service. We encourage experiments and improvements of basic Ramsey kits, but we ask that you first get the kit working as designed and understand it - before making ANY changes. - Page 20 You might be planning to combine several Ramsey circuit kit boards in a single enclosure. Use of the inexpensive and attractive Ramsey case and knob set will give your unit that nice finished look and increase its resale value. These sturdy black instrument cases are supplied with printed overlayes on front and rear panels, knobs, rubber feet and mounting screws.
- Page 21 However, you also will be interested to know that test QSO's, including DX, were made with this Ramsey transmitter using both a mobile whip antenna and simple dipole on the balcony of a condo building.
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Page 22: 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 23 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" of this kit straight from the Ramsey Inventory.
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Page 24: Ramsey Kit Warranty
Initial tests ........17 Troubleshooting guide ....22 Ramsey kit warranty .....23 REQUIRED TOOLS • Soldering Iron Ramsey WLC100 TOTAL SOLDER POINTS • Thin Rosin Core Solder Ramsey RTS12 • Needle Nose Pliers Ramsey MPP4 or ESTIMATED ASSEMBLY RTS05 TIME • Small Diagonal Cutters Ramsey RTS04 Beginner ....
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