User manual RAMSEY QRP20

[. . . ] 20 METER (14MHz) CW TRANSMITTER Ramsey Electronics Model No. QRP20 THE RAMSEY QRP20 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 8 - 10 KHz of tuning about the crystal frequency Front panel switching of TWO channels and includes a crystal for 14. 06 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! [. . . ] Install varactor diode D4, observe flat side placement. Install R3, 1 megohm (brown-black-green). Install C2, 68 pf. QRP-20 · 14 29. Install R6, 470 ohms (yellow-violet-brown). With the above components installed correctly, the three holes for Q1 should be clearly apparent. Make sure Q1 is correctly identified as a 2N3904. Install R7, 100 ohms (brown-black-brown). Install C4, . 01 (marked . 01 or 103 or 10 nf). Install R5, 10K ohms (brown-black-orange). 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. This is most especially true with low power transmitters!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 power supply or battery capable of 500 mA is required. 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. Some method of verifying satisfactory RF output. We will give you several of these in detail in the "Verifying Transmitter RF power Output" section on page 18. [. . . ] DO NOT send a separate letter; include all correspondence with the unit. Please do not include your own hardware such as non-Ramsey cabinets, knobs, cables, external battery packs and the like. Ramsey Electronics, Inc. , reserves the right to refuse repair on ANY item in which we find excessive problems or damage due to construction methods. To assist customers in such situations, Ramsey Electronics, Inc. , reserves the right to solve their needs on a case-by-case basis. [. . . ]