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   SR-1

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Radio Canada International: editorial quality similar to 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 U.S. military radio- hear CBS-NBC-ABC-Mutual news all  on 
the same "channel," plus many other features and spots  which give a 
feel for how it's going with those in uniform. 

Numerous South American stations 

USA religious broadcasting to other continents 

 
You'll easily tune in broadcasts from many other countries as well. As you 
become more and more familiar with the world of shortwave broadcasting, 
you'll be deciding on your own favorite band. 
 
You will hear a variety of other "interesting" sounds, but just remember that 
this receiver is designed for AM only. If a Morse Code signal really sounds 
"good," it is because it is being transmitted in AM tone-modulated form, or 
perhaps the signal is so close to an AM broadcast 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 intelligible. Reception of CW and SSB signals on an AM receiver requires 
a BFO. This is not a complicated feature, but it is beyond the purpose of the 
SR-1. Our companion receivers designed for the HAM bands will let you tune 
into these SSB and CW broadcasts. 
 

SHORTWAVE LISTENING AS A HOBBY IN ITSELF 

 
Many people worldwide enjoy listening to shortwave broadcasts of all kinds, 
and they keep written records of what they hear. Almost every nation on 
earth has  some sort of shortwave broadcast service, though many are much 
more challenging to tune than the powerful signals of Radio Moscow and the 
BBC. In addition, these "SWLs" (Shortwave Listeners) listen to ham 
operators, government and commercial stations and even clandestine 
operations. Some shortwave listeners enjoy collecting QSL cards from 
stations which they have logged. Shortwave listening is, for some, a step 
toward getting a ham radio license. For others, it is a great hobby in itself. 
The SR-1 Shortwave Receiver is a good introductory receiver for this hobby. 
After you decide exactly what kinds of listening are of the most interest to 
you, you'll be a better position to choose a more elaborate receiver. While 
there are various multi-band portable radios available, you can expect to pay 

Summary of Contents for SR-1

Page 1: ...Ideal scout school or club project Clear concise step by step instructions carefully guide you to a finished kit that not only works but you ll also learn too Runs on a standard 9 volt battery Add our...

Page 2: ...s HR Series HF All Mode Receivers QRP Series HF CW Transmitters CW 7 CW Keyer PA Series VHF and UHF Power Amplifiers Packet Computer Interfaces QRP Power Amplifiers RAMSEY MINI KITS Many other kits ar...

Page 3: ...an Expect to Hear 4 Shortwave Listening as a Hobby 5 Circuit Description 6 Parts Layout Diagram 7 Parts List 8 Assembly Instructions 9 Schematic Diagram 12 Shortwave Antenna Ideas 15 Initial Testing a...

Page 4: ...ons due to the lack of superheterodyne design For example our popular Ramsey direct conversion receivers for the 80 40 30 and 20 Meter Amateur bands will also pick up AM broadcast stations but you ll...

Page 5: ...ou tune through several different ham radio bands the signals are not likely to be intelligible Reception of CW and SSB signals on an AM receiver requires a BFO This is not a complicated feature but i...

Page 6: ...rmits a tuning range of over 2 5 Mhz by R2 The mixer output is applied to the 260 Khz bandpass IF transformer and amplified by Q2 and Q3 The AM audio is detected by D2 and preamplified by U2 A before...

Page 7: ...SR 1 7 SR 1 PARTS LAYOUT DIAGRAM...

Page 8: ...R10 R11 3 47K ohm yellow violet orange R7 R8 R15 2 100K ohm brown black yellow R12 R13 1 1M ohm brown black green R14 SEMICONDUCTORS 1 1N270 diode glass bead style D2 1 Varactor diode transistor style...

Page 9: ...stood 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 Let your soldering...

Page 10: ...round The antenna signal coupled through C1 level controlled by R1 peaked by L1 is now fed to input pins 1 and 2 of the NE602 Pin 3 of the NE602 is now connected to ground as required 9 Install C16 a...

Page 11: ...owing from the antenna to C7 you already have built a direct conversion shortwave receiver capable of CW SSB reception throughout the SR 1 s tuning range If you want to prove it to yourself connect an...

Page 12: ...1K brown black red 34 Install C10 01 F marked 01 103 or 10nF 35 Install R8 47K yellow purple orange 36 Install R9 1K brown black red 37 Install C12 01 F marked 01 103 or 10nF 38 Referring to Step 29...

Page 13: ...F may be installed and black leads are inserted correctly 60 Install the battery clamp Position battery and holder so as not to cover nearby PC board mounting holes Use the method for securing the cl...

Page 14: ...antenna is necessary simply make it as long as possible and as high up from concrete floors as you can 5 When installing any outdoor antenna BE VERY CAREFUL not to let your antenna wire come in contac...

Page 15: ...down from its highest position The Tuning Control covers any 2 5 Mhz segment selected by adjustment of oscillator coil L2 Both L1 and L2 must be adjusted with a non metallic alignment tool such as is...

Page 16: ...tolerances of the capacitors and coils involved Also notice how the amount of frequency change per turn increases with each turn However we can see that a setting of somewhere between 4 and 5 turns mi...

Page 17: ...most reception quite satisfactory with the RF gain at its midpoint or so PROBLEM Local AM radio station audible throughout tuning range SOLUTION Whether this will even happen depends on how close you...

Page 18: ...ter we are happy to give you a couple of additional suggestions and our reasons for them If your first goal is economy and rugged portability you will find that the circuit board can be mounted nicely...

Page 19: ...u use your own enclosure and knobs you will probably plan some sort of dial markings If you finish your receiver with the Ramsey custom case and knob kit you may wish to copy one of the following desi...

Page 20: ...SR 1 20 Notes...

Page 21: ...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 22: ...ial Information 20 Ramsey Kit Warranty 23 Manual Price Only 5 00 Ramsey Publication No MSR 1 Assembly and Instruction manual for RAMSEY MODEL NO SR 1 SHORTWAVE RADIO KIT Printed on Recycled Paper REQU...

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