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AM25 

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 ("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. 

Содержание AM25

Страница 1: ...h for high school college or neighborhood radio station in use the world over Easily programmed via DIP switch to any clear channel on the AM broadcast band from 540 to 1710 KHz Operates on the same p...

Страница 2: ...IO 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 available for hobby school sc...

Страница 3: ...ic Diagram 7 Parts Layout Diagram 8 Parts List 9 Assembly Instructions 10 Frequency chart 18 Alignment Procedures 19 Troubleshooting 20 FCC Information 20 Antenna Experimenting 22 Ramsey Kit Warranty...

Страница 4: ...radio stations Re broadcasting received audio for shortwave or HAM radio use Listening aid for auditoriums churches or other events Short range experimentation We think that you will be very pleased w...

Страница 5: ...ng auto transformer L4 from Q8 and Q9 thus producing an AM output waveform This signal is then low pass filtered using C1 C7 and inductors L1 3 Notice that the audio information is applied at the powe...

Страница 6: ...from the VCO Voltage Controlled Oscillator and divides it by a number that we ll call N N is the frequency data that was sent by U2 and N is always equal to the desired frequency in megahertz times 10...

Страница 7: ...AM25 7...

Страница 8: ...AM25 8 PARTS LAYOUT DIAGRAM...

Страница 9: ...0 pF disc capacitor marked 0022 or 222 or 2200K C2 3 6 7 2 3900 pF disc capacitor marked 0039 or 392 or 3900K C4 5 2 4700 pF disc capacitor marked 0047 or 472 or 4700K C4 5 2 5600 pF disc capacitor ma...

Страница 10: ...atsinks 80 enameled magnet wire 2 4 40 x 1 4 screw 2 4 40 kepnut ASSEMBLY INSTRUCTIONS There are numerous solder connections on the AM25 printed circuit board Therefore PLEASE take us seriously when w...

Страница 11: ...tched ends of IC s and so forth 6 Solder all connections unless directed otherwise Use enough heat and solder flow for clean shiny completed connections 7 Trim or nip all excess wires extending beyond...

Страница 12: ...intain frequency exactly as programmed 12 Install C13 01 uf disc capacitor marked 01 or 103 of 10 nf 13 Install C14 another 01 uf disc capacitor 14 Install jumper JMP2 Simply use a small scrap of comp...

Страница 13: ...llow violet brown 28 Install Q10 2N3904 transistor Be sure to orient it correctly See the parts diagram for correct orientation 29 Install Q2 another 2N3904 transistor watch that flat side 30 Install...

Страница 14: ...mishaps Later stages of the transmitter require extra care so better to catch errors now rather than later 49 Install C19 001 F disc capacitor marked 001 or 102 50 Install R20 1 K ohm brown black red...

Страница 15: ...tion burn off and a nice coating of solder attach to the copper wire under the enamel insulation Gosh it takes longer to explain than to do it 66 Position the wire ends so that the three wires are in...

Страница 16: ...k brown 83 Install JMP3 using a scrap component lead wire 84 Install Q8 2N3904 transistor observe placement of the flat side 85 Install C17 01 F disc capacitor marked 01 or 103 or 10nF 86 Install C22...

Страница 17: ...ncy you wish to set your transmitter to It really is not sufficient to just check the AM band for an empty frequency using the AM radio closest at hand It is your responsibility to research what AM st...

Страница 18: ...entire circuit board Energizing the circuit board with solder bridges or misplaced components can damage your kit ANTENNA CONSIDERATIONS For many applications a 5 6 foot wire antenna connected to the...

Страница 19: ...6 close switched 128 16 and 2 A calculator comes in handy when you successively subtract the binary numbers 128 64 4 2 1 It really is quite easy and fun to find the right switches to close ALIGNMENT P...

Страница 20: ...o double check the assembly steps going backwards from the last step to the the first Bright lighting and a magnifying aid can be helpful in identifying soldering problems Use a methodical logical tro...

Страница 21: ...listeners have all the rights Your non licensed use of any device such as the AM25 has absolutely no rights at all over the rights of a licensed broadcast operator If your operation of the AM25 interf...

Страница 22: ...Here s a neat antenna idea the 1 1 2 PVC loading coil will fit nicely into 2 diameter PVC pipe Get a 10 foot length run the long antenna wire up through the pipe and over the edge a bit slip a PVC pi...

Страница 23: ...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...

Страница 24: ...for RAMSEY MODEL NO AM25 SYNTHESIZED AM TRANSMITTER KIT REQUIRED TOOLS Soldering Iron WLC100 Thin Rosin Core Solder RTS12 Needle Nose Pliers MPP4 or RTS05 Small Diagonal Cutters RTS04 ADDITIONAL SUGGE...

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