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QAMP20 • 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 new 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 incredibly 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 like. 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 QAMP20

Page 1: ...elay automatically switches between receive and transmit Runs on 12 volts DC at 2 to 4 amps ideal for field day or battery operation Multistage low pass filter for a clean signal Operates all modes CW...

Page 2: ...r 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 available for hobby school Scouts a...

Page 3: ...ctions 7 Initial tests 12 Verifying RF output power 13 Troubleshooting tips 15 Using the QAMP20 16 Parts layout diagram 17 Schematic diagram 18 Ramsey kit warranty 19 KIT ASSEMBLY AND INSTRUCTION MANU...

Page 4: ...P amplifier is very simple with most of the magic being done by just a few parts the pair of MOSFET transistors and the ferrite wideband transformers Transformer T2 matches the 50 ohm amplifier input...

Page 5: ...70 ohm resistors red violet brown R8 9 1 51 ohm resistor green brown black R10 1 2 2 K ohm resistor red red red R11 1 5 K potentiometer marked 502M R4 SEMICONDUCTOR DEVICES 1 Zener diode 6 2 volt gray...

Page 6: ...the problems we find here at the factory are due to faulty assembly no matter how experienced the builder may be it s especially tough to tell a 30 year experienced ham that he goofed Before you run...

Page 7: ...RCA phono jacks Solder all 4 pins on each securely as these connectors will be subjected to some stress when coax cables are connected to them 3 Install J3 PC mount DC power jack 4 Install relay K1 N...

Page 8: ...or proper operation Generally capacitors have their lead marked with a black stripe while PC boards have the hole indicated 22 Install D1 6 2 volt Zener diode gray body with a black band This diode pr...

Page 9: ...nother 180 f disc capacitor marked 180 or 181 38 Install wire jumper JMP1 Use a scrap piece of component lead wire 39 Locate the MOSFET power transistors and prepare the leads for insertion into the P...

Page 10: ...t or a magic marker We don t want to confuse it with the other two toroid coils wound just before 43 Winding T2 Locate the smaller of the two 2 hole ferrite cores Cut off one 11 inch length of enamele...

Page 11: ...le or too much then you have not wound the core correctly Tin each end with solder as before Tin all the way up to the core body 46 Cut off another length of wire 9 inches long Wind 1 turn through the...

Page 12: ...for testing you ll need the following 1 Multimeter capable of measuring voltage and current 2 12 volt DC power source of at least 3 amp capacity 3 Suitable dummy load and resonant antenna 4 QRP trans...

Page 13: ...r transmitter with good amateur practice YOUR POWER SUPPLY AND RF OUTPUT POWER For optimum performance one or two volts of extra DC supply power can make quite a difference in any RF power amplifier F...

Page 14: ...m 2 to 25 volts RMS depending on various factors Typically 1 watt power levels are achieved in the 5 to 7 volts RMS range 5 watts at 12 to 15 volts and 10 watts at 20 to 25 volts A good test bulb for...

Page 15: ...e for this occurring Any prolonged parasitic emissions may also overheat and destroy other components in the amplifier TROUBLESHOOTING HINTS The QRP power amplifier is very straight forward and simple...

Page 16: ...r QRP operation and an amplifier is not a band aid for a poor antenna system For maximum performance a QRP station must include the following 1 A resonant antenna dipole or quarter wave vertical 2 Goo...

Page 17: ...keyer etc The controls are easily mounted at one end of such a box It may be necessary to cut away the molded posts which secure the tape itself These storage boxes come in several styles so pick one...

Page 18: ...QAMP20 18...

Page 19: ...h 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...

Page 20: ...Quality Electronics Kit was designed and packed in the USA REQUIRED TOOLS Soldering Iron Ramsey WLC100 Thin Rosin Core Solder Ramsey RTS12 Needle Nose Pliers Ramsey MPP4 or RTS05 Small Diagonal Cutte...

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