Ramsey Electronics LPA1 Instruction Manual Download Page 19

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 properly. The very fact that your kit includes this manual is your 
assurance that a team of knowledgeable people have field-tested several "copies" of this kit straight 
from the Ramsey Inventory. If you need help, please read through your manual carefully, all 
information required to properly build and test your kit is contained within the pages!   
 

1. DEFECTIVE PARTS:

 It's always easy to blame a part for a problem in your kit, Before you conclude 

that a part may be bad, thoroughly check your work. Today's semiconductors and passive components 
have reached incred bly high reliability levels, and it’s sad to say that our human construction skills 
have not! But on rare occasions a sour component can slip through. All our kit parts carry the Ramsey 
Electronics Warranty that they are free from  defects for a full ninety (90) days from the date of 
purchase. Defective parts will be replaced promptly at our expense. If you suspect any part to be 
defective, please mail it to our factory for testing and replacement. Please send only the defective part
(s), not the entire kit. The part(s) MUST be returned to us in suitable condition for testing. Please be 
aware that testing can usually determine if the part was truly defective or damaged by assembly or 
usage. Don't be afraid of telling us that you 'blew-it', we're all human and in most cases, replacement 
parts are very reasonably priced.   
 

2. MISSING PARTS:

 Before assuming a part value is incorrect, check the parts listing carefully to see 

if it is a critical value such as a specific coil or IC, or whether a RANGE of values is suitable (such as 
"100 to 500 uF"). Often times, common sense will solve a mysterious missing part problem. If you're 
missing five 10K ohm resistors and received five extra 1K resistors, you can pretty much be 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 
believe we packed an incorrect part or omitted a part clearly indicated in your assembly manual as 
supplied with the basic kit by Ramsey, please write or call us with information on the part you need 
and proof of kit purchase 
 

3. FACTORY REPAIR OF ASSEMBLED KITS:

  

To qualify for Ramsey Electronics factory repair, kits MUST:     
1. NOT be assembled with acid core solder or flux. 
2. NOT be modified in any manner. 
3. BE returned in fully-assembled form, not partially assembled. 
4. BE accompanied by the proper repair fee. No repair will be undertaken until we have received the 

MINIMUM repair fee (1/2 hour labor) of $25.00, or authorization to charge it to your credit card 
account. 

5. INCLUDE a description of the problem and legible return address. DO NOT send a separate letter; 

include all correspondence with the unit. Please do not include your own hardware such as 
    non-Ramsey cabinets, knobs, cables, external battery packs and the l ke. Ramsey 
Electronics, Inc., reserves the right to refuse repair on ANY item in which we find excessive 
problems or damage due to construction  methods. To assist customers in such situations, 
Ramsey Electronics, Inc., reserves the right to solve their needs on a case-by-case basis. 

 
The repair is $50.00 per hour, regardless of the cost of the kit. Please understand that our technicians 
are not volunteers and that set-up, testing, diagnosis, repair and repacking and paperwork can take 
nearly an hour of paid employee time on even a simple kit. Of course, if we find that a part was 
defective in manufacture, there will be no charge to repair your kit (But please realize that our 
technicians know the difference between a defective part and parts burned out or damaged through 
improper use or assembly). 
 
4. REFUNDS: You are given ten (10) days to examine our products. If you are not satisfied, you may 
return your unassembled kit with all the parts and instructions and proof of purchase to the factory for 
a full refund. The return package should be packed securely. Insurance is recommended. Please do 
not cause needless delays, read all information carefully. 

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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