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Ramsey Electronics PA1 Instruction Manual

Manual is about: 2 METER RF POWER AMPLIFIER KIT

Summary of PA1

  • Page 1

    Pa-1 • 1 2 meter rf power amplifier kit ramsey electronics model no. Pa1 • works with any radio; mobile, fixed or handheld • 8 to 10 times the power gain: 10 watts out for every 1 watts in, 20 watts out for every 2 watts in, 30 watts out for every 3 watts in! • easy connection to a radio • operates ...

  • Page 2

    Pa-1 • 2 partial list of available kits ramsey transmitter kits • fm10, fm25b fm stereo transmitters • fm100 super pro fm transmitter • mr6 model rocket tracking transmitter • am1, am25 am transmitters ramsey receiver kits • fr1 fm broadcast receiver • ar1 aircraft band receiver • sr2 shortwave rece...

  • Page 3: 2 Meter Rf Power

    Pa-1 • 3 2 meter rf power amplifier kit ramsey publication no. Pa1 price $5.00 table of contents kit building tips ............................... 5 parts list ........................................... 5 assembly .......................................... 6 parts layout diagram ......................

  • Page 4

    Pa-1 • 4 pa1 amplifier all of us at ramsey say thanks for your interest in building the world's most popular 2 meter amplifier project. Successful construction and installation of your pa1 amplifier can give your handheld 2 meter transceiver an rf power boost beyond the performance of many fixed and...

  • Page 5

    Pa-1 • 5 kit building tips use a good soldering technique - let your soldering iron tip gently heat the traces to which you are soldering, heating both wires and pads simultaneously. Apply the solder on the iron and the pad when the pad is hot enough to melt the solder. The finished joint should loo...

  • Page 6

    Pa-1 • 6 assembly directions: ❒ 1. Simply examine the pa1 circuit board. Notice which way is up or down in accord with our published drawing. Notice that all components are surface-mounted (tack-soldered) to one side of the pc board. There are no component-mounting holes! ❒ 2. Taking care that your ...

  • Page 7

    Pa-1 • 7.

  • Page 8

    Pa-1 • 8 ❒ 5b. Tack-solder c1, one of the mica compression trimmer capacitors, using enough heat for a solid, good connection. ❒ 6. Install c3, the other compression trimmer, just like c1. ❒ 7a. Bend the leads of c2, the round trimmer capacitor, at right angles so that it can also sit in a level and...

  • Page 9

    Pa-1 • 9 ❒ 11a. Using the #18 enameled wire, wind a 5-turn coil for l3. The inside diameter is also 1/4", the turns should be close-wound, and the ends should be 1/4-inch long. Using a small knife or sandpaper, scrape the insulation from each end, tin the bare ends with solder, and gently bend the e...

  • Page 10

    Pa-1 • 10 make a suitable heatsink for q1 and install it before proceeding. A piece of heavy aluminum or copper the same size as the pa1 circuit board will work fine. Even when securing q1 to such a heatsink, do not use too much force. Observe the correct orientation of q1 on the actual circuit boar...

  • Page 11

    Pa-1 • 11 initial testing required for testing: • 1 to 5 watt 2 meter transmitter or transceiver. • 12 volt dc power source, 5 amp minimum. • rf wattmeter suitable for vhf use. • correct cables and connectors. • 50-ohm 30-50 watt dummy load (use antenna for testing only in accordance with appropriat...

  • Page 12

    Pa-1 • 12 transmit-receive ["t-r"] switching considerations: t-r switching of a single antenna with a 2 meter transceiver and the pa1 rf amplifier may be accomplished in any of these ways: • 1. Internal connections to your transceiver, making use of its built-in t-r switching circuit or relay. • 2. ...

  • Page 13

    Pa-1 • 13 customizing your pa1 installation: since it's up to you to supply the enclosure, connectors and any desired operating conveniences, it's likely that each one of those thousands of pa1s in use today has its own personality. For some good ideas, take a look at "turn your ht into a 40w 2m mob...

  • Page 14

    Pa-1 • 14 a note for experienced builders on linear operation for ssb, and other emission types: please undertake this conversion only if you understand the theory and practice involved. Otherwise, please get help from another ham experienced in amplifier design. This conversion changes the power tr...

  • Page 15

    Pa-1 • 15 pa1 warranty notice: the pa1 kit is the only item in the entire ramsey product line that is not covered under any warranty. Because of the variety of ways in which this kit can be constructed and mounted mechanically, we cannot offer any kit repair service. So, if this kit appears too comp...

  • Page 16

    Pa-1 • 16 pa1 2 meter rf power amplifier quick reference page guide kit building tips ................................ 5 parts list ............................................ 5 assembly .......................................... 6 parts layout diagram ....................... 6 schematic diagram .....