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   SR2

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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 $18.00, 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 $36.00 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 SR2

Page 1: ...ne circuit is easy to build makes a nice one evening project Ideal scout school or club project Clear concise step by step instructions carefully guide you to a finished kit that not only works but yo...

Page 2: ...RADIO KITS DDF1 DopplerDirection Finder HR Series HF All Mode Receivers QRP Series HF CW Transmitters CPO3 Code Practice Oscillator VLF1 Low Bander Low Frequency SWL Converter QRP Power Amplifiers RAM...

Page 3: ...t You Can Expect to Hear 4 Shortwave Listening as a Hobby 5 Circuit Description 6 Parts Layout Diagram 8 Block Diagram 9 Parts List 10 Assembly Instructions 12 Schematic Diagram 14 Shortwave Antenna I...

Page 4: ...in receiving broadcast stations due to the lack of superheterodyne design For example our popular Ramsey direct conversion receivers for the 40 30 and 20 Meter Amateur bands will also pick up AM broad...

Page 5: ...roadcast carrier that the carrier acts as a beat frequency oscillator BFO Even though this receiver can let you tune through several different HAM radio bands the signals are not likely to be intellig...

Page 6: ...ll schematic pg 14 shows the details concerning specific operation and component variable configurations Take a moment and examine the circuit block diagram found on page 9 The simplified signal flow...

Page 7: ...proper relationship between Fc and the LO exists the IF value will stay constant Due to the fact that the IF frequency stays the same all the time the Intermediate Frequency Filter can be very narrow...

Page 8: ...tomatic Gain Control AGC The gain control looks at the amount of signal level present at the output of the demodulator and varies the amount of gain the Amplifier has accordingly If there is a strong...

Page 9: ...ate F req ue ncy F ilte r A u dio S p e ak er S R 2 B lo c k D ia g ram L o ca l O scilla to r A G C D e m od S ig n a l S tren g th L E D A u to m atic G a in C o n trol R ece ive S ig n al S tren g...

Page 10: ...ectrolytic capacitor C26 INDUCTORS 2 1 H inductors looks like a resistor with brown black gold bands L1 L2 1 12 H inductor looks like a resistor with brown red black bands L3 2 Shielded can inductors...

Page 11: ...PC mount jack J1 1 Subminiature phone jack J2 1 9 volt battery snap connector 1 9 volt battery hold down clamp REQUIRED NOT SUPPLIED 9 volt alkaline or heavy duty battery Earphone small speaker or ext...

Page 12: ...f each step as understood and completed Some of the components require modification Examine the schematic circuit diagram and PC Board parts layout diagram as you proceed Use good soldering techniques...

Page 13: ...n NPN transistor marked 2N3904 This part is also oriented by the flat side so check your parts layout diagram for proper placement Bend the center lead out until it fits in the board and seat the part...

Page 14: ...SR2 14...

Page 15: ...SR2 15...

Page 16: ...cess We ll now move on to the RF section of your SR2 kit The next few parts form an input filter and mixer section to combine the RF input with the L O section just built The output of the mixer is th...

Page 17: ...red orange 43 Install T1 one of the shielded can inductors marked 42IF 103 44 Install R5 100K ohm brown black yellow 45 Install R6 10K ohm brown black orange 46 Install C28 01 F disc capacitor marked...

Page 18: ...r 104 62 Install U1 the LM358 8 pin IC Do not confuse it with the other IC read the chip marking carefully You will notice a notch band or dot on one end of the IC This should be oriented as shown on...

Page 19: ...ntenna and whether you think you may soon want to obtain a HAM radio license If the latter is true you may want to consult HAM radio literature and build the dipole or vertical antenna which you also...

Page 20: ...even a VHF scanner It s easy to build and a nice companion for your SR2 If you need more construction details on antennas check the book mentioned on page 6 or any introductory HAM radio book or the R...

Page 21: ...river like blade on the end of a wooden match stick kabob skewer or small plastic crochet needle Again please be aware that a metal screwdriver blade will drastically increase the coil inductance and...

Page 22: ...cuit is confirmed working standard signal tracing procedures should isolate any problem which will be either an incorrectly installed part a defective part or a bad solder connection Correct orientati...

Page 23: ...will find that the circuit board can be mounted nicely in a standard VHS videotape storage box which also gives room for a speaker or earphone storage and even a roll of antenna wire The controls are...

Page 24: ...mx 7 12 ITALY nx in EG re Columbus 2000 project ID 8 45 CHINA V of Russia relay Moscow Mailbag nx of Russia 9 02 IRAN nx re OPEC ID fqy sked 9 34 ISRAEL Kol Israel HB 2142 discussion US oldies 9 90 B...

Page 25: ...Notes Contributor MHz 18 96 SWEDEN Sweden Today special on Nobel prizes 18 96 SWEDEN Sweden Today article on burden of military spending on developing countries 18 96 SWEDEN Cinema Africa Film Fest b...

Page 26: ...SR2 26...

Page 27: ...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 b...

Page 28: ...ranty 27 Manual Price Only 5 00 Ramsey Publication No MSR2 Assembly and Instruction manual for RAMSEY MODEL NO SR2 SHORTWAVE RADIO KIT REQUIRED TOOLS Soldering Iron Ramsey WLC100 Thin Rosin Core Solde...

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