User manual RAMSEY QRP40

[. . . ] QRP40 THE RAMSEY QRP-40 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 7. 040 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!Cases match all Ramsey products QRP-40 · 1 PARTIAL LIST OF AVAILABLE KITS RAMSEY TRANSMITTER KITS · FM10A FM Stereo Transmitter · FM100B Professional FM Stereo Transmitter · FM25B Synthesized FM Stereo Transmitter · AM25 Synthesized AM Transmitter · AM1 AM Transmitter RAMSEY RECEIVER KITS · FR1 FM Broadcast Receiver · AR1 Aircraft Band Receiver · AA7 Active Antenna · SC1 Shortwave Converter · SR2 Shortwave Receiver RAMSEY HOBBY KITS · SG7 Personal Speed Radar · SS70 Speech Scrambler · TT1 Telephone Recorder · SP1 Speakerphone · MD3 Microwave Motion Detector · PH10 Peak hold Meter · TFM3 Tri-Field Meter RAMSEY AMATEUR RADIO KITS · DDF1 Doppler Direction Finder · HR Series HF All Mode Receivers · QRP Series HF CW Transmitters · CW7 CW Keyer · CPO3 Code Practice Oscillator · QRP Power Amplifiers RAMSEY MINI-KITS Many other kits are available for hobby, school, scouts and just plain FUN. [. . . ] Now that the explanations are done, let's install some more parts!Install L1, the shielded "can" inductor (marked 42EB). Solder the two small pins as well as the larger mounting tabs. 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). 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 plug or adapter to mate with the RCA key jack on this transmitter. It is preferable but perhaps not essential that this cable be shielded. We will give you several of these in detail in the "Verifying Transmitter RF power Output" section on page 18. Feel free to read ahead before picking up the soldering iron again. QRP-40 · 15 CRYSTAL OSCILLATOR TESTING: Connect a key, keyer or momentary switch to J3. Keying J3 should result in a crisp, clean oscillator signal in your receiver. Adjusting the R1 tuning control should vary the crystal frequency approximately 5 KHz. Also, you will notice that the VXO circuit usually swings the frequency down, a fact to remember if you order additional crystals. NOTE TO NEWCOMERS:Please be aware that even this one transistor oscillator is itself a transmitting device, quite capable in good propagation conditions of emitting an RF signal and HARMONICS, when and if connected to an antenna. It is correct practice to keep your test brief and to identify them with your callsign. FURTHER ASSEMBLY; The following three steps connect a simple low-pass filter to the antenna jack. The low-pass filter prevents harmonics from the transmitter from reaching the antenna. [. . . ] 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. 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! [. . . ]