User manual RAMSEY QRP80

[. . . ] 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. · · · · · · · · · 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 RAMSEY TRANSMITTER KITS · FM-10 FM Stereo Transmitter · FM-1, 2, 3, 4 FM Wireless Microphones · PB-1 Telephone Transmitter RAMSEY RECEIVER KITS · FR-1 FM Broadcast Receiver · AR-1 Aircraft Band Receiver · SR-1 Shortwave Receiver · AA-7 Active Antenna · SC-1 Shortwave Converter RAMSEY HOBBY KITS · SG-7 Personal Speed Radar · SS-70 Speech Scrambler · TT-1 Telephone Recorder · SP-1 Speakerphone · MD-3 Microwave Motion Detector · PH-10 Peak hold Meter · LC-1 Inductance-Capacitance Meter RAMSEY AMATEUR RADIO KITS · FX Series VHF and UHF Transceivers · HR Series HF All Mode Receivers · QRP Series HF CW Transmitters · CW-700 Micro Memory CW Keyer · PA Series VHF and UHF Power Amplifiers · Packet Computer Interfaces · QRP Power Amplifiers RAMS E EY LECTR I CS ON ki tb u il d e th rs i n e RAMSEY MINI-KITS Many other kits are available for hobby, school, Scouts and just plain FUN. [. . . ] We'd like to suggest a better approach, which is to build up the VXO stage (variable-crystal-oscillator) around Q1 and test it before finishing the rest of the transmitter. BUILDING THE VXO (VARIABLE CRYSTAL OSCILLATOR): Your QRP transmitter comes complete with one crystal in the CW range, usually the suggested QRP international calling frequency. S1 permits your choice of any two installed crystals, the one that comes with your kit and another which you may add on your own. If you plan to add a socket for your own crystal, it should be wired to the "A" crystal position. 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. (The reason for these holes is that different frequency bands require various styles of inductors and capacitors for correct VXO frequency and shift). Now, since we have gone to all this explaining, let's install some more parts!Install L1A and L1B, the slug tuned inductors. The inductors have three mounting pins and stand up-right. Install varactor diode D3, observe correct placement of the flat side. (Varactor diodes act as a variable capacitor whose capacitance is varied by the voltage applied across it). QRP-80 · 15 27. With the above components installed correctly, the three holes for Q1 should be clearly apparent. It's time to decide which crystal(s) are to be installed in which position and to install at least one of them for testing. Notice that there are two pairs of holes for each crystal connection, so that you can install virtually any standard crystal case style. 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. To try out this transmitter, you will need the following, and we'll offer suggestions about each of them: A healthy and CLEAN source of 12-14 volts DC, connected with CORRECT POLARITY. A receiver capable of CW reception on the same band as this transmitter, with a coaxial antenna line terminated in a plug or adapter to mate with the receiver jack on this transmitter. A resonant antenna with a 50 ohm coaxial feedline such as RG58, terminated in a plug or adapter to mate with the RCA antenna jack on this transmitter. A CW key, keyer or computer interface connected to a cable terminated in a QRP-80 · 16 45. Install L2, 100µH (brown-black-brown-silver) The buffer stage is now completed and connected to the base of the power amplifier stage, Q3. Install L3, 3. 9µH inductor (marked LQ396 or with orange-gold-white bands). Install D1, 1N4002 (large black epoxy body), notice placement of banded end. [. . . ] If you need help, please read through your manual carefully, all information required to properly build and test your kit is contained within the pages!DEFECTIVE PARTS: It's always easy to blame a part for a problem in your kit, Before you conclude that a part may be bad, thoroughly check your work. Today's semiconductors and passive components have reached incredibly high reliability levels, and it's sad to say that our human construction skills have not!All our kit parts carry the Ramsey Electronics Warranty that they are free from defects for a full ninety (90) days from the date of purchase. [. . . ]