User manual RAMSEY QRP40

[. . . ] 40 METER (7MHz) CW TRANSMITTER Ramsey Electronics Model No. 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! [. . . ] Install C1, . 01 uf (marked . 01 or 103 or 10 nf). Install R2, 1 megohm (brown-black-green). 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). Install varactor diode D4, observe flat side placement. Install R3, 1 megohm (brown-black-green). Install C3, 330 pf (marked 330 or 331). QRP-40 · 14 30. 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. [. . . ] MISSING PARTS: Before assuming a part value is incorrect, check the parts listing carefully to see if it is a critical value such as a specific coil or IC, or whether a RANGE of values is suitable (such as "100 to 500 uF"). Often times, common sense will solve a mysterious missing part problem. If you're missing five 10K ohm resistors and received five extra 1K resistors, you can pretty much be assured that the '1K ohm' resistors are actually the 'missing' 10 K parts ("Hum-m-m, I guess the 'red' band really does look orange!") Ramsey Electronics project kits are packed with pride in the USA. If you believe we packed an incorrect part or omitted a part clearly indicated in your assembly manual as supplied with the basic kit by Ramsey, please write or call us with information on the part you need and proof of kit purchase 3. [. . . ]