Instruction/ maintenance manual of the product PA1 Ramsey Electronics
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PA-1 • 1 2 METER RF POWER AMPLIFIER KIT Ramsey Electronics Model No. P A 1 • Work s with a ny ra dio; m obile , fixed or han dheld • 8 to 10 tim es the po wer gain: 10 watt s out for e very 1 wa.
PA-1 • 2 P ARTIAL LIST OF AVAIL ABLE KITS RA MSEY T RA NSMIT T ER KI TS • FM10, FM25B FM Ster eo Transmitter s • FM100 Super Pr o FM Transmi tter • MR6 Model Rocket Track ing Transmitter • A.
PA-1 • 3 2 METER RF POWER AMPLIFIER KIT Ramsey Publication N o. PA1 Price $5.00 TABLE OF CONTENTS Kit Building Tips ......................... ...... 5 Parts list ............. ................. ............. 5 Assembly .. ................. .........
PA-1 • 4 PA1 AMPLIFIER All of us at Ramse y say T HANKS for yo ur interest in building the world's most popular 2 Meter amplifier pr oject. Successful construction and installation of your PA1 amplifier can give your handheld 2 Meter transceiver an RF power boost b eyo nd the performance of many fixed and mobile units.
PA-1 • 5 KIT BUILDING TIPS Use a good soldering t echniqu e - let your solderin g iron ti p gentl y heat the traces to which you ar e solder ing, heatin g both wires and pads sim ultaneous ly. Apply the solder on the iron and the pad when the pad is hot enough to melt the solder.
PA-1 • 6 ASSEMBLY DIRECTIONS: ❒ 1. Simply EXAMINE the PA1 circuit board. Notice w hich way is up or down in accord with our published drawing. Notice that ALL components are surface-mounted (tack-solde red) to one side of the PC board. There are NO component- mounting holes! ❒ 2.
PA-1 • 7.
PA-1 • 8 ❒ 5b. Tack-solder C1, one of the Mica compression trimmer capacitors, using enough he at for a solid, go od connection . ❒ 6. Install C3, the other compression trimmer, j ust 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.
PA-1 • 9 ❒ 11a. Using the #18 enameled wire , wind a 5-turn coil f or L3. The inside diameter is also 1/4", the turns s hou ld be close-wound, and the ends should be 1/4-inch long.
PA-1 • 10 make a suitable HEATSINK for Q1 and in stall it before proceeding. A piece of heavy aluminum or copper the sam e 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 o f Q1 on the actual circuit board when mountin g it to t he heatsink.
PA-1 • 11 INITIAL TESTING Required for testing: • 1 to 5 watt 2 Meter transmitter or transceiv er. • 12 volt DC power source, 5 amp minimum. • RF wattmeter suitable f or VHF use.
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 amplif ier may be accomplished in an y of these wa ys: • 1. Internal conn ections to you r transceiver, making use of its built-in T-R switching circuit or relay.
PA-1 • 13 CUSTOMIZING YOUR PA1 INSTA LLATION: Since it's up to you to supply the en closure, connectors and any desired operating conveniences, it's likely that each one of those thousands of PA1s in use today has its own personality.
PA-1 • 14 A NOTE FOR EXPERIENCED BUILDERS ON LINEAR OPERATION FOR SSB, AND OTHER EMISSION TYPES: Please undertake this conversion ONLY if you understa nd the theo ry and practice involved. Ot herwise, p lease get h elp from another ham e xperienced in amplifier design.
PA-1 • 15 PA1 WA RRANTY NOTICE: The PA1 k it is the only item in th e entire Ramsey product line that is not covered under any warra nty. Beca use of the variety of ways in which this kit can be constructed and mounted mechanically , we cannot offer any kit repair service.
PA-1 • 16 PA1 2 METE R RF POWER AMPLIF IER Quick Referenc e Page Guide Kit Building Tips ..................... ........... 5 Parts list .................... ................. ....... 5 Assembly ........ ............. ................. .... 6 Parts Layout Diagram .
An important point after buying a device Ramsey Electronics PA1 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Ramsey Electronics PA1 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Ramsey Electronics PA1 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Ramsey Electronics PA1 you will learn all the available features of the product, as well as information on its operation. The information that you get Ramsey Electronics PA1 will certainly help you make a decision on the purchase.
If you already are a holder of Ramsey Electronics PA1, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Ramsey Electronics PA1.
However, one of the most important roles played by the user manual is to help in solving problems with Ramsey Electronics PA1. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Ramsey Electronics PA1 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
