Qrp30 • 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. • ideal for portable or travel fun • vcxo design allows up to 5 - ...
Qrp30 • 2 ramsey transmitter kits • fm100b professional fm stereo transmitter • fm25b synthesized stereo transmitter • am1, am25 am transmitters • tv6 television transmitter ramsey receiver kits • fr1 fm broadcast receiver • ar1 aircraft band receiver • sr2 shortwave receiver • aa7 active antenna • ...
Qrp30 • 3 qrp30 30 meter cw transmitter kit ramsey publication no. Qrp30 price $5.00 table of contents introduction to the qrp30 ............. 4 understanding power levels ........... 5 circuit description .......................... 8 simplified block diagram ................ 8 parts list .............
Qrp30 • 4 introduction: most "qrp" transmitters are one-of-a-kind experimental circuits which take some patience and fine-tuning to get clean keying and satisfactory performance. Most qrp building projects presume either unlimited radio junkboxes with all the right coils and capacitors, or that you ...
Qrp30 • 5 power! Different from a receiver, you want to see some measurable output power and you especially want to make two-way contacts! 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...
Qrp30 • 6 which gets a report of "10 db. Over s-9" measured on the receiving station's s- meter. Assume identical dipole antennas at both stations. Our chart does not start at the proverbial "30 db. Over s-9" and work itself down to s-1 for reasons that will become obvious. S9+10 db. 1000 watts outp...
Qrp30 • 7 use of some 10db gain antenna such as a beam or quad by either station could move the s7 for .625 watt up to s8, and that a similar antenna used at the other station could give the under 1 watt signal a further boost over s9! On the other hand, if you hear a 1000 watt station producing a m...
Qrp30 • 8 circuit description: in brief, q1 is a crystal oscillator, amplified by buffer stage q2, which drives q3 as the rf output amplifier. Q4 is a pnp keying circuit which opens and closes the 12vdc supply line to q1 and the t-r circuitry of d1 and d2. S1 selects either of two crystals. R1,d3,d4...
Qrp30 • 9 parts supplied with qrp30 transmitter kit: capacitors: 2 47 pf capacitor (c2,c6) 1 220 pf capacitor (marked 220 or 221) (c17) 2 470 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) 1 100 to 220 uf electrolytic capacito...
Qrp30 • 10
Qrp30 • 11 qrp30 parts layout diagram:.
Qrp30 • 12 learn-as-you-build" transmitter assembly strategy: as you can see in examining the circuit board and components, there is a bit more to this transmitter kit than soldering a few parts and putting a signal on the air. So that you don't spend extra time "troubleshooting" instead of getting ...
Qrp30 • 13 4. Insert and solder j4 (dc power +12 to 14 volts) 5. Insert and solder r1, the 10k tuning potentiometer. 6. Insert and solder s1, pushbutton switch. Carefully select, insert and solder the following components in the order given in the following steps. Check off each step as completed. 7...
Qrp30 • 14 18. Install r15, 10k ohms (brown-black-orange). 19. Install c13, .01 uf (marked .01 or 103 or 10 nf). 20. Install r14, 10k ohms (brown-black-orange). 21. Install q4, be sure to orient its flat side correctly as shown. 22. Install c15, .01 uf (marked .01 or 103 or 10 nf). So far, here's wh...
Qrp30 • 15 28. Install r3, 1 megohm (brown-black-green). 29. Install r4, 10k (brown-black-orange). 30. Install c2, 47 pf. 31. Install c3, 470 pf (marked 470 or 471). 32. Install r6, 470 ohms (yellow-violet-brown). With the above components installed correctly, the three holes for q1 should be clearl...
Qrp30 • 16 ◊ a valid fcc amateur radio license. ◊ 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. Feel free to read ahead before picking up the soldering iron again. Crystal oscillator tes...
Qrp30 • 17 the buffer stage is now completed and connected to the base of the power amplifier stage, q3. 46. Install r10, 270 ohms (red-violet-brown). 47. Install l3, 1 uh inductor (brown body with wire wrapped around it). 48. Install c14, .01 uf (marked .01 or 103 or 10 nf). 49. Install c9, .01 uf ...
Qrp30 • 18 your power supply and rf output power : for optimum performance, one or two volts of extra dc supply power can make quite a difference for this transmitter. For example, two lantern batteries in series, or 8 "d cells" obviously provide "about 12 volts" with sufficient current capability f...
Qrp30 • 19 flashlight bulb or the type 243 bulb with screw-in body. Both are rated to give normal brilliance at 2.33 volts, drawing 270 milliamps of current. Using ohm's law p=ie, we see that normal brilliance requires 2.33 volts x .270 amperes for .62 watts of dc power consumption. We can conclude ...
Qrp30 • 20 trans-receive operation: if you plan to use this transmitter with a ramsey hr-series direct conversion receiver for portable operation, it will be necessary to work out a receiver muting and keying sidetone circuit. A matching companion to your transmitter is the new ramsey cw-7 cmos keye...
Qrp30 • 21 note on choosing, ordering crystals: when ordering crystals for ramsey qrp transmitters, specify 32 picofarad load capacitance, parallel resonance, hc-6/u or hc-18/u holder, although virtually any crystal will work. The back of ham magazines have ads for many different crystal suppliers (...
Qrp30 • 22 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. If the transmitter does not work, th...
Qrp30 • 23 the ramsey kit warranty please read carefully before calling or writing in about your kit. Most problems can be solved without contacting the factory. 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 assemble...
Qrp30 • 24 30 meter cw transmitter kit quick reference page guide introduction ....................................4 understanding power levels ...........5 circuit description ...........................8 parts list ..........................................9 schematic diagram ........................
