Power booster amplifier ramsey electronics model no. Lpa1 looking to boost the output of a small transmitter or signal generator? Look no further. Our general purpose broadband power amplifier is ideal for the test bench as well as any ham radio applications. Get up to 1 watt rf power output! • stat...
Lpa1 • 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 sho...
Lpa1 • 3 lpa1 power booster amplifier ramsey publication no. Mlpa1 price $5.00 table of contents introduction to the lpa1 ................... 4 how it works .................................... 4 lpa1 parts list ................................. 7 schematic diagram .......................... 8 parts...
Lpa1 • 4 welcome to the lpa power booster amplifier thank you for purchasing the lpa1 power booster amplifier. The lpa -1 is a state of the art amplifier for almost any low power transmitter. With a fre- quency range from 100khz to almost 1ghz, it is no wonder that it is so ver- satile. And with an ...
Lpa1 • 5 there are three other parts of this circuit. One simply turns on and supplies power to the circuit. The second, supplies power to the mav3 amplifier. The third biases q2 for proper operation. Ramsey “learn-as-you-build” power booster assembly strategy since the lpa1 runs at very high freque...
Lpa1 • 6 double sided component soldering instructions: you’ll notice that the circuit board contains plating on both sides of the board, with a large ground “plane” area on the component side of the circuit board. In order to electrically connect this topside ground plane to the bottom side ground ...
Lpa1 • 7 ramsey lpa1 power booster amplifier parts list semiconductors ❒ 1 mar3 rf amplifier [small, black, round on one side] (u1) ❒ 1 pnp transistor [marked 221334] (q1) ❒ 1 mrf581 npn power transistor [small, black, round and marked “581”] (q2) ❒ 1 red led (d1) capacitors ❒ 8 .01uf disc capacitor...
Lpa1 • 8.
Lpa1 • 9 lpa1 parts layout diagram.
Lpa1 • 10 feedback circuit: your ramsey lpa1 power booster amplifier has been designed to give you great amplification over a wide range of frequencies. Included in the design of the circuit is a feedback loop consisting of the parts r8 and c5. You must decide whether or not to include the feedback ...
Lpa1 • 11 now we will begin building our kit. There are just a few more things to know before we put the first components in. For each part, our word “install” always means these steps. 1 pick the correct value to start with. 2 insert it into the correct pc board location. 3 orient it correctly, fol...
Lpa1 • 12 ❒ 4. Install j1, the power jack. This is a black plastic jack. Solder the connection on the back of the jack to the bottom side of the board. Now, solder the other connection to both the bottom and the top sides. ❒ 5. Install s1, the main switch. The switch is black, with a white button co...
Lpa1 • 13 now that we have completed the power circuits, we will move on to the biasing circuit. This circuit holds the transistor output voltages in the desired range. ❒ 13. Install c1, .01uf capacitor [marked .01 or 103 or 10nf]. Make sure that you crack or peel off the insulation on the legs of t...
Lpa1 • 14 ❒ 22. Install c9, .01uf capacitor [marked .01 or 103 or 10nf]. The insulation should be stripped from the legs and a topside connection made nearest the edge of the board. Now that you have installed the biasing circuit, we have only a few more parts to put in before we install the amplifi...
Lpa1 • 15 solder them directly onto the board. All four leads should now be connected. Again, make sure that the small “m” is closest to l1. This is very important. ❒ 31. Find u1, the mar3 amplifier. This looks like q2, which you have just installed, but is a bit smaller and has a dot printed on it....
Lpa1 • 16 setup and testing now you are ready to set up and test your amplifier. Follow the steps below. If you have any problems, refer to our troubleshooting section. ❒ 1. Plug your kit into a 12v power source with the switch on your lpa1 turned off (click it until it is in the “out” position). Yo...
Lpa1 • 17 problem: the amplified signal is distorted. Solution: make sure that all of the component leads are as short as possible. Leaving the leads longer than necessary leaves you open for noise. You should also check the gain. You may be overdriving the amplifier. Try lowering the input power or...
Lpa1 • 18 conclusion we sincerely hope that you have enjoyed the construction of this ramsey kit. As always, we have tried to compose our manual in the easiest, most “user friendly” format that is possible. As our customers, we value your opinions, comments, and additions that you would like to see ...
Lpa1 • 19 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 assembled...
Lpa1 • 20 lpa1 power booster amplifier quick reference page guide introduction to the lpa1 ................... 4 how it works ..................................... 4 lpa1 parts list .................................. 7 schematic diagram ........................... 8 parts layout diagram ...............
