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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! 

State of the art “MMIC” amplifier technology ensures great 
quality amplification. 

 

The perfect lab amplifier for any lab bench!  Excellent 
bandwidth and gain characteristics make the LPA1 a useful tool 
for amateurs and professionals alike. 

 

Boost almost any low power transmitter, up to 10mW maximum 
input, from 300Khz to 1Ghz with up to one watt of power. 

 

Specially engineered PC board makes building a snap! 

 

No maintenance operation makes the LPA1 perfect for hassle 
free operation. 

 

Amplification at up to 7,000 times the input power at 10Mhz! 

 

Perfect for boosting your QRP transmitter.  Works on all bands 
from 160 meters to the 1Ghz band! 

 

Summary of Contents for LPA1

Page 1: ...lification The perfect lab amplifier for any lab bench Excellent bandwidth and gain characteristics make the LPA1 a useful tool for amateurs and professionals alike Boost almost any low power transmit...

Page 2: ...onitor RAMSEY AMATEUR RADIO KITS HR Series HF All Mode Receivers QRP Series HF CW Transmitters CW7 CW Keyer CPO3 Code Practice Oscillator QRP Power Amplifiers RAMSEY MINI KITS Many other kits are avai...

Page 3: ...F CONTENTS Introduction to the LPA1 4 How It Works 4 LPA1 Parts List 7 Schematic Diagram 8 Parts Layout Diagram 9 Feedback Circuit Considerations 10 LPA1 Assembly Instructions 11 Setup and Testing 16...

Page 4: ...p in the manual in order and practice good sol dering and kit building skills the kit is next to fail safe Circuit description Your Power Booster Amplifier consists of a simple circuit in terms of com...

Page 5: ...troubleshooting section to guide you through them Please remember that most problems occur out of bad soldering technique and improperly placed components A clear head and a meter are all that you pro...

Page 6: ...so instructed be sure the solder flows around the topside connection as shown When installing a disc capacitor be sure to scrape away any insulating material which may be coated on the lead near the c...

Page 7: ...and bare wire to wind through it L1 1 5 6uH inductor resembles a resistor marked green blue gold yellow L2 RESISTORS 1 6 8 ohm resistor blue grey gold R2 4 1K ohm resistor brown black red R1 5 6 7 1 1...

Page 8: ...LPA1 8...

Page 9: ...LPA1 9 LPA1 PARTS LAYOUT DIAGRAM...

Page 10: ...ou are using and how much gain you require from the circuit Installing the feedback circuit has proven to add more circuit stability and immunity to spurious signals If you are experiencing difficulty...

Page 11: ...o your work in stages taking breaks to check your work Brush away any wire cuttings so that they don t lodge between solder connections Since you may appreciate some warm up soldering practice as well...

Page 12: ...be to the left when properly installed Capacitors allow AC waves to pass while blocking off DC power C3 filters off any noise in the power circuit into ground before it can affect the circuit 8 Instal...

Page 13: ...or blue grey gold 17 Install R6 1K ohm resistor brown black red Solder the lead closest to the LED to the top side as well as the bottom side 18 Find C2 01uF capacitor marked 01 or 103 or 10nF Take of...

Page 14: ...ake the insulation off of the legs first 25 Install C7 01 uF capacitor marked 01 or 103 or 10nF Strip the insulation off of the legs before installing 26 Install C8 01 uF capacitor marked 01 or 103 or...

Page 15: ...u have just completed your LPA1 Power Booster Amplifier Please take a few minutes to look over your kit and ensure that all of the parts have been assembled correctly Since a few of the parts may be u...

Page 16: ...ur transmitting distance several times and you may find yourself going far away from your house That s all that you need to do to test it out You may now use your LPA1 for it s intended purpose You do...

Page 17: ...er and the amplifier Tables of resistor values can be found in various sources including the ARRL Handbook an annual publication of the ARRL Due to the fact that there are so many combinations of resi...

Page 18: ...submit comments or ideas to Ramsey Electronics Attn Hobby Kit Department 590 Fishers Station Drive Victor NY 14564 Thanks again from the folks at Ramsey USAGE WARNING Just as there is nothing illegal...

Page 19: ...e assured that the 1K ohm resistors are actually the missing 10 K parts Hum m m I guess the red band really does look orange Ramsey Electronics project kits are packed with pride in the USA If you bel...

Page 20: ...blication No MLPA1 Assembly and Instruction manual for RAMSEY MODEL NO LPA1 POWER BOOSTER AMPLIFIER REQUIRED TOOLS Soldering Iron Ramsey WLC100 Thin Rosin Core Solder Ramsey RTS12 Needle Nose Pliers R...

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