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PR20—15 

The Ramsey Kit Warranty 

 

Please read carefully BEFORE calling or writing in about your kit. Most problems can be solved without contacting the factory.

 

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. 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.  
 

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. If you 
believe we packed an incorrect part or omitted a part, 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.

 

Содержание PR20

Страница 1: ...mall size to fit in any rig The most popular preamp kit in the USA Easy 15 minute assembly Perk up your reception on 220 MHz with this easy to build and install kit Works well with any radio especiall...

Страница 2: ...s may be designed for either RF or audio use and may be either tuned or broadbanded The Ramsey Low Noise PR10 20 and 40 Preamplifiers for 144 220 and 440 MHz respectively differ from our popular SA7 a...

Страница 3: ...a bipolar silicon NPN low noise UHF VHF amplifier in a TO 92 case suitable for service up to 5 GHz with maximum device dissipation of 600 milliwatts Q1 has a very low noise figure determined by the bi...

Страница 4: ...isc capacitor may be marked 01 103 or 10nF C5 RESISTORS 1 470 ohm yellow violet brown R1 1 100K ohm brown black yellow R2 OTHER COMPONENTS 1 PRX printed circuit board 1 shielded adjustable coil L1 mar...

Страница 5: ...PR20 5 RAMSEY PR20 PRE AMP PARTS LAYOUT NOTE FOR PR 20 Disregard C6...

Страница 6: ...he first try For your convenience the PC board is considerably enlarged While working with a small PC board such as the PR20 a miniature vise plus a magnifier may prove very helpful In all steps below...

Страница 7: ...tion Press the transistor in place firmly with finger pressure so that a minimum amount of wire leads are exposed above the PC board In soldering do not be afraid to apply enough heat to make good cle...

Страница 8: ...opriate part installations Correct parts placement checked PC board soldering checked touched up if needed INPUT AND OUTPUT CONNECTIONS Use short pieces of miniature coax such as RG 174 to connect the...

Страница 9: ...is is a low noise preamp don t look for an imaginary increase in noise level or waste time trying to make a strong repeater signal seem stronger CAUTION Under no circumstances should transmitter RF ev...

Страница 10: ...e Use good quality miniature coaxial cable STRONG SIGNAL OVER LOADING If you live in a situation where there are very strong nearby stations you may experience overloading of the receiver to which the...

Страница 11: ...ures an on board battery supply adjustable gain control heavy duty whip HF VHF mode switching and jack for using external antennas T R SWITCHING CONSIDERATIONS FOR TRANSCEIVER OPERATION If you wish to...

Страница 12: ...Other maximum ratings Collector to Base Voltage 25 V Collector to Emitter Voltage 12 V Base to Emitter Voltage 3 V Maximum Collector Current 70 mA Standard replacements ECG10 or SK9139 You may of cour...

Страница 13: ...gth of resistors or capacitors Erratic operation will be traced to poor input output or voltage connections or a faulty solder connection CONCLUSION Please make sure your preamplifier is working as or...

Страница 14: ...so with very low noise plus the convenient AC power supply BNC I O connectors and LED ON OFF indicator of the Ramsey PR2 available factory wired The PR2 uses advanced microwave MMIC for signal to nois...

Страница 15: ...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 return...

Страница 16: ...Professional FM Stereo Transmitter RAMSEY RECEIVER KITS FR1 FM Broadcast Receiver AR1 Aircraft Band Receiver SR2 Shortwave Receiver SC1 Shortwave Converter RAMSEY HOBBY KITS SG7 Personal Speed Radar...

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