Qamp-30 • 1 ramsey electronics model no. Qamp30 need a little extra boost for your qrp rig? Believe it or not, 20 watts is only about an ‘s’ unit below a 100 watt rig! This nifty little amp will add some “punch” to any qrp transmitter. • works great with ramsey qrp rigs or any other 1-2 watt transmi...
Qamp-30 • 2 ramsey transmitter kits • fm100b professional fm stereo transmitter • fm25b synthesized stereo fm transmitter • mr6 model rocket tracking transmitter • tv6 television transmitter ramsey receiver kits • fr1 fm broadcast receiver • ar1 aircraft band receiver • sr2 shortwave receiver • sc1 ...
Qamp-30 • 3 ramsey publication no. Mqamp30 price $5.00 table of contents introduction to the qamp30 ........... 4 how it works ................................... 4 parts list ......................................... 5 tips and notes ............................... 6 qamp30 assembly instructions .....
Qamp-30 • 4 introduction the ramsey qamp series of qrp power amplifiers are compact 10 to 20 watt rf amplifiers for qrp cw transmitters. These amplifiers are made to be driven by transmitters in the ½ to 2 watt range. Built-in to the power amplifier is a sensitive t-r relay which will switch the uni...
Qamp-30 • 5 parts list for the qamp30 qrp power amplifier capacitors: 1 100 to 220 µf electrolytic capacitor [c1] 1 10 µf electrolytic capacitor [c2] 4 .1 µf disc capacitor (marked .1 or 104) [c3,8,10,13] 2 330 ρf disc capacitor (marked 330 or 331) [c4,7] 2 560 ρf disc capacitor (marked 560 or 561) ...
Qamp-30 • 6 "the ramsey learn-as-you-build assembly strategy" take a look at the parts layout diagram. There is quite a lot to the construction of the qamp30. It's easier than it seems once you get going, especially after you have installed a few of the "landmark" components. Once these "landmark" c...
Qamp-30 • 7 • if helpful, gently bend the part’s wire leads or tabs to hold it in place, with the body of the part snugly against the top side (component side) of the pc board. • solder all wires or pins of the part, whether the 2 wires of a resistor or the 3 or 4 wires of a transistor. • trim all e...
Qamp-30 • 8 16. Install diode d4, 1n4002 style black epoxy diode. Check positioning of the banded end. 17. Install jumper jmp2. Use a piece of scrap component lead wire bent into a "staple" shape and inserted into the board like a component. Jumpers act as electronic "bridges" carrying signals over ...
Qamp-30 • 9 these last four parts (r8,9 and c11,12) form parasitic suppression networks across each transistor to suppress any tendency for high frequency oscillation in the power amplifier. 32. Install c3, another .1 µf disc capacitor (marked .1 or 104). Both of these capacitors bypass the center t...
Qamp-30 • 10 we're almost finished. All we need to do now is install a few remaining parts that have to be handmade - for that "old-world craftsmanship" touch! We'll prepare all those parts now for further assembly. We give you plenty of enameled wire, but if you mess up, you can get a whole 50' spo...
Qamp-30 • 11 amount of wire cut for this task is the proper amount. If you have too little or too much, then you have not wound the core correctly. Tin each end with solder as before. Tin all the way up to the core body. This winding is the primary of transformer t2. 44. Cut off another length of wi...
Qamp-30 • 12 47. Locate the smaller transformer (t2) and install it snugly on the pc board. 48. Install the larger transformer (t1) into the indicated location on the pc board. 49. Install l1, a 15 turn toroid inductor wound previously. If desired, a small dab of hot melt glue, bathtub sealer, or ca...
Qamp-30 • 13 3. Connect a dummy load to j1, the amplifier rf output. In a pinch, a light bulb may be used - see the section, "verifying rf power output." 4. Temporarily install a jumper from the collector of q3 to ground. 5. Apply power to the amplifier but do not turn on the transmitter. Measure th...
Qamp-30 • 14 verifying transmitter rf output the most important thing to know is whether your transmitter is delivering some measurable and reassuring level of rf power. Then you can continue on to adding the qrp amplifier and checking out the whole set-up. Ideally, you have a small rf wattmeter, al...
Qamp-30 • 15 amateur radio magazines and handbooks provide a variety of circuits for rf wattmeters and relative field-strength indicators, including methods of using your vom as an indicating device. Cq magazine for march 1990 offers an article by kb4zgc on how to make a highly accurate yet inexpens...
Qamp-30 • 16 if you hear an ac hum on the transmitted signal, usual causes are rf getting back into the power supply or a bad vswr on the antenna. These short checks in no way detail any and all problems that can rear their ugly head, but should get you on the way to solving most errors. We'd like t...
Qamp-30 • 17 while we believe that the ramsey enclosure and knob option is a fine value for finishing off your ramsey kit, we are happy to give you a couple of additional suggestions and our reasons for them. If your first goal is economy and rugged portability, you will find that the circuit board ...
Qamp-30 • 18.
Qamp-30 • 19 amateur radio magazines and handbooks provide a variety of circuits for rf wattmeters and relative field-strength indicators, including methods of using your vom as an indicating device. Cq magazine for march 1990 offers an article by the ramsey kit warranty please read carefully before...
Qamp-30 • 20 qamp30 20 watt linear amplifier quick reference page guide introduction to the qamp-30 ..........4 how it works ...................................4 parts list ..........................................5 qamp-30 assembly instructions .....6 initial testing ..... ...........................
