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SC-1 

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Notice that the 11MHz band is available in BOTH the B-C and A-C jumper 
settings for L1. The higher frequency bands are intended primarily for 
daytime broadcasting. Reception quality is very dependent upon atmospheric 
propagation conditions.    
 
Even though there is quite a sport and science to digging up exotic 
broadcasts from hundreds of countries in any of the above bands, 
newcomers will find more immediate satisfaction from setting up L1 for the 9 
MHz (31 Meter) band, and L2 for 5.9 to 6.2 MHz. With this arrangement, 
you'll easily find the "major" international broadcasts anytime you want to 
listen. Especially strong signals include these, among others:       
 

BBCLondon: an intelligent perspective on world affairs    

RadioCanada International: editorial quality similar to the BBC    

Radio Moscow: powerful signals, increasingly honest and open    

Voice of America: VOA broadcasts are "aimed" outside the USA, but  if 
you're in the "path" you'll hear it loud and clear!     

U.S. Armed Forces Radio-TV "Feed" Service: Master programming  
source for the U.S. military radio - hear CBS-NBC-ABC-Mutual  news on 
all the same "channel", plus many other features and  spots which give a 
feel for how it's going with those in uniform.      

 
You'll easily tune broadcasts from many other countries as well. As you 
become more and more familiar with the world of shortwave broadcasting, 
you'll be making your own choices on how best to set up the convenient 
options possible with your SC1.    
 
An easy way to adjust the SC1 is to use another shortwave radio to listen for 
the SC1's strong oscillator signal. For eample, if you set L1 so that you hear 
the signal at 9.0 MHz on another receiver, your SC1 is set to receive 9.5 
MHz at 500 KHz, 9.6 at 600, 9.7 at 700, and so forth.  
 

OPTIONAL CRYSTAL CONTROL  

  

 
With S2 in the pushed-in position, the SC1 is designed so that L2 can be 
easily replaced by a crystal. Install a crystal of your choice in the 3 to 10 MHz 
range. An extra hole is drilled near the L2 mounting holes to make crystal 
insertion easy. Consult the schematic diagram. Replace C10 with a jumper 
wire. The received frequency will be the crystal frequency plus or minus the 
AM radio dial frequency.    
 

Summary of Contents for SC1

Page 1: ...h any AM radio car radios are ideal Tune from your regular radio dial easily set station presets etc on your existing radio Operates on 9 to 15 volts Listen to worldwide broadcasts in your car boat or...

Page 2: ...er Direction Finder 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 hob...

Page 3: ...to the SC1 4 What you can expect to hear 5 Parts list 6 SC1 Parts layout 7 SC1 Circuit description 8 SC1 Assembly instructions 9 Setting up the SC1 12 Setting your listening bands 13 Understanding wha...

Page 4: ...g receiver Virtually any receiver can be converted to receive other bands in this manner The receiver functions as a tuneable IF and its good circuit qualities carry over to the newly received frequen...

Page 5: ...dulation You will also hear a variety of other interesting sounds but just remember that this receiving set up is designed for listening to AM style broadcast formats Morse code CW or teletype signals...

Page 6: ...marked 42IF123 L1 1 Shielded coil marked 42EB L2 3 3 9 uH inductor green body with a large silver band followed by orange gold white silver bands L3 L4 L5 RESISTORS 2 470 ohms yellow violet brown R4...

Page 7: ...SC 1 7 RAMSEY SC1 PARTS LAYOUT...

Page 8: ...nge of the AM radio For example to receive 10 MHz WWV the radio dial is set to 1000 KHz and the SC 1 oscillator is set to 9 MHz Another way of viewing it is that if the oscillator is set to 9 MHz the...

Page 9: ...the schematic circuit diagram from time to time Enough talk let s get building 1 Install J3 the DC power jack 2 Install J1 the antenna or RF input jack 3 Install S1 the first of two DPDT push style sw...

Page 10: ...20 Install transistor Q1 2N3904 Observe correct position of the flat side 21 Install C13 4 7 or 10 uF the ONLY electrolytic or polarized capacitor in the SC1 kit Electrolytic capacitors have a right...

Page 11: ...ion before installation There is a small tubular capacitor visible in the plastic bottom of the coil that needs to be removed which is done by crushing it with the tip of a small screwdriver or the po...

Page 12: ...and hard wiring into the car s fuse block Some automobile ignition systems cause noise which needs to be suppressed for satisfactory operation of ANY radio device When using this converter in a car y...

Page 13: ...n how to set up L1 and L2 for your choice of two 1 MHz SW bands selected by S2 tuned by the AM radio If you aren t familiar with shortwave broadcast band frequency allocations but have and know how to...

Page 14: ...dio TV Feed Service Master programming source for the U S military radio hear CBS NBC ABC Mutual news on all the same channel plus many other features and spots which give a feel for how it s going wi...

Page 15: ...IO HAMS AND EXPERIMENTERS The SC1 Shortwave Converter can be a fun platform for putting an extra AM radio set to work for listening to your favorite band Brand new AM only car radios pulled from new v...

Page 16: ...s that includes a nifty Stereo FM Transmitter You can transmit your favorite music or radio calls throughout the house and yard with this low cost kit Another handy kit is our Speakerphone kit that al...

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Page 18: ...SC 1 18...

Page 19: ...tty 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...

Page 20: ...Ramsey Publication No SC1 Assembly and Instruction manual for RAMSEY MODEL NO SC1 SHORTWAVE CONVERTER KIT REQUIRED TOOLS Soldering Iron Ramsey WLC100 Thin Rosin Core Solder Ramsey RTS12 Needle Nose Pl...

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