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Ramsey Electronics PA1 Instruction Manual

2 meter rf power amplifier kit
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2 METER RF POWER
AMPLIFIER KIT
Ramsey Electronics Model No.
Give your handheld a big boost with this economical power
amplifier kit. Thousands have built and enjoyed this kit; one
magazine review even said, "probably the best bargain in Ham
radio!"
•
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 on 12 - 14 volts DC, draws a maximum of 5 amps
•
Just add a T-R relay, case, Pre-amp if desired and connectors
•
Informative manual answers questions on theory, hookup and uses -
enhances resale value, too!
•
Maximum output of 35 - 40 watts, max drive of 8 watts
•
Mounts in any small aluminum case, which then will act as a heatsink
•
Yes, this is the amplifier that's been reviewed in all the Ham magazines!
•
Clear, concise assembly instructions carefully guide you to a finished
kit that works FIRST time!
PA-1 • 1
PA1

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Summary of Contents for Ramsey Electronics PA1

  • Page 1 2 METER RF POWER AMPLIFIER KIT Ramsey Electronics Model No. Give your handheld a big boost with this economical power amplifier kit. Thousands have built and enjoyed this kit; one magazine review even said, “probably the best bargain in Ham radio!”...
  • Page 2 RAMSEY MINI-KITS Many other kits are available for hobby, school, scouts and just plain FUN. New kits are always under development. Write or call for our free Ramsey catalog. PA1 2 METER RF POWER AMPLIFIER KIT INSTRUCTION MANUAL Ramsey Electronics publication No. PA1 Revision 1.1 First printing: December 1994 COPYRIGHT 1994 by Ramsey Electronics, Inc.

  • Page 3: Table Of Contents

    Schematic Diagram ......7 Testing ..........11 Troubleshooting ....... 11 Transmitting-Receiving ....12 Customizing ........13 Installation ........13 Operating Your PA1 ......13 Warranty ........... 15 RAMSEY ELECTRONICS, INC. 590 Fishers Station Drive Victor, New York 14564 Phone (585) 924-4560 Fax (585) 924-4555 www.ramseykits.com...
  • Page 4 14 and think about a few details in advance: The PA1 is a true "Ham Radio" kit project which presumes the expertise that goes along with your license. You need to know how to "tack solder", wind simple VHF coils per our directions, and how to finish your PA1 with suitable enclosure, connectors, T-R switching and I/O wiring.

  • Page 5: Kit Building Tips

    The part is then soldered securely to the board, and the remaining lead length is then clipped off. PA1 PARTS LIST: 1 PA1 Printed circuit board 1 BLW40 or SD1272 RF Power Transistor 1 Length of pre-tinned #18 wire (for L1,L2)

  • Page 6: Assembly

    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.
  • Page 7 PA-1 • 7...
  • Page 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 flat position.
  • Page 9 So...NOW is the time to decide how you are going to enclose your PA1. If that decision is still to come and you wish to experiment with the performance of the PA1 before designing a finished accessory such a "docking booster", then...

  • Page 10: Testing

    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 board when mounting it to the heatsink.

  • Page 11: Troubleshooting

    ID procedures). DC voltage may be applied to the PA1 at all times. As a Class C amplifier, it draws current only with RF drive. For the first test, use just 2 or 3 watts of RF drive.
  • Page 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.

  • Page 13: Customizing

    INSTALLATION NOTES: • 1. The best location for the relay is as close to the PA1 amplifier PC board as possible with a short solid connection from the relay contact to the amplifier input. If more than 1 inch, use coax.
  • Page 14 270-ohm resistor one end and center of a 500-ohm trimmer pot 4. Solder the other end of the 270 ohm resistor to the PA1 groundplane foil. 5. Connect the remaining end of the 500 ohm pot through a 51 ohm resistor to a neatly routed wire to the +12 volts DC input to the PA1.
  • Page 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.

  • Page 16: Operating Your Pa1

    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 ......7 Testing ..........11 Troubleshooting ........ 11 Transmitting-Receiving ..... 12 Customizing ........

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