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 23  

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.  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 leg ble 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 SP1

Страница 1: ...he trick and doubles as a hands free intercom too Completely Hands free talk and listen at will Needs no battery runs off the phone line Sensitive pick up throughout the room Excellent speaker volume...

Страница 2: ...plifier RAMSEY AMATEUR RADIO KITS DDF1 Doppler Direction Finder HR Series HF All Mode Receivers QRP Series HF CW Transmitters VLF1 Low Frequency SWL Converter CPO3 Code Practice Oscillator QRP Power A...

Страница 3: ...S Introduction to the SP1 4 Parts list for the SP1 5 Parts layout diagram 6 Assembly instructions 7 Schematic diagram 12 Initial testing 15 Optimizing your set up 16 Understanding Speakerphones 17 Opt...

Страница 4: ...ild and to customize for your own needs and decor The Ramsey Speakerphone is designed to let you stay in charge of your time on a budget Think about the difference between that call you wish or plan t...

Страница 5: ...2 47K ohm yellow violet orange R7 R12 4 100K ohm brown black yellow R11 R15 R16 R17 1 68K ohm blue gray orange R5 SEMICONDUCTORS 1 MC65118 28 pin DIP speakerphone IC U1 1 LM386 8 pin DIP audio amplif...

Страница 6: ...SP 1 6 SP 1 PARTS LAYOUT DIAGRAM...

Страница 7: ...g out before soldering The part is then soldered securely to the board and the remaining lead length is clipped off SP1 ASSEMBLY INSTRUCTIONS We have a twofold strategy for the order of the following...

Страница 8: ...only two pins are actually used in the circuit 5 Examine the subminiature jack J1 supplied for speaker connection It fits into the PC board position easily Notice that the tab nearest to the edge of...

Страница 9: ...panel and therefore requires soldering the MK1 element s terminals to three short bare wires nipped from a previously installed component so that the three wires are at right angles to the MK1 lugs No...

Страница 10: ...r step and go back to it after you ve built up your scrap wire supply Jumpers act as electronic bridges carrying signals over PC board traces underneath 23 Near R3 install JMP11 24 Install JMP5 25 Ins...

Страница 11: ...RESS SUMMARY The schematic diagram makes it clear that building the kit consists largely of providing the supporting components for the many functions of the MC65118 IC Much of that has been done alre...

Страница 12: ...SP 1 12 SP1 SCHEMATIC DIAGRAM...

Страница 13: ...re that all 28 pins are visible on the solder side of the board Slightly bend the 4 outermost pins to lock the socket in place Make sure the socket is flush against the top of the board Solder all 28...

Страница 14: ...umper Wire from point A to point C near D3 2 Set both S1 and S2 to their out or off position Set the volume control to a mid range point 3 Next test the modular phone cord you intend to use with the S...

Страница 15: ...thing above checks out you re ready for your first Speakerphone conversation Ask someone to call you When you hear the ring on any other phone you can answer the call by pressing S1 You should be able...

Страница 16: ...ents OPTIMIZING YOUR SPEAKERPHONE SET UP There are three variables to be considered in any line powered Speakerphone installation 1 Positioning of speaker in relation to the microphone 2 Your distance...

Страница 17: ...our head or on a sketch pad Both stations must have speakers and sensitive microphones and be interconnected by two wires only and there can be no manual talk listen switches You must be able to turn...

Страница 18: ...ovides background noise monitors which make the circuit insensitive to room and line noise hybrid amplifiers for interfacing to Tip and Ring i e the phone line the microphone amplifier and other funct...

Страница 19: ...cted to the line or loop The phone line carries both audio energy AC and DC voltage T1 and T2 couple the audio signals to U1 s hybrid amplifiers pins 5 and 6 In telephone terminology hybrid is a circu...

Страница 20: ...nd C21 15 Supplies bias to volume control filtered by C24 16 Time constant for TX BNM set by R11 and C16 17 Input to TX level detector on mike speaker side 18 Output of TX level detector and input to...

Страница 21: ...one or more SP1 s you probably already have some handy switching ideas We ll leave those to your ingenuity To set up two SP1 s for hands free intercom service just do the following 1 Solder a jumper f...

Страница 22: ...SP 1 22 PARTS LAYOUT DIAGRAM SP1 SPEAKERPHONE KIT...

Страница 23: ...sistors you can pretty much be assured that the 1K ohm resistors are actually the missing 10 K parts Ramsey Electronics project kits are packed with pride in the USA If you believe we packed an incorr...

Страница 24: ...AL SOLDER POINTS 242 ESTIMATED ASSEMBLY TIME Beginner 4 0 hrs Intermediate 2 5 hrs Advanced 1 5 hrs REQUIRED TOOLS Soldering Iron WLC100 Thin Rosin Core Solder RTS12 Needle Nose Pliers MPP4 or RTS05 S...

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