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FR-1 • 1 

Ramsey Electronics Model No.              FR1 

Build your own FM Broadcast receiver.  Radio covers 70 to 110 
Mhz, ideal for tuning in out-of-band FM wireless mikes, ‘bugs’ 
and other transmitters that exist where ‘others’ can’t find them!  
An added feature of the FR1 is its SCA output, which allows 
easy connection of SCA decoders - for commercial -free music, 
stock quotes, sports, etc.

 

 

Typical uses for the FR1 FM radio receiver: 
 

Tuning in hidden FM wireless mikes and phone bugs 

Hooking up SCA adapters 

Learning how FM receivers operate 

Snooping around for clandestine transmitters 

Just plain ol’ easy listening to the standard FM radio 

 
The Ramsey FR1 FM Broadcast receiver features: 

 

Runs on 9 volt battery 

Choice of on-board whip antenna or external antenna 

Stable tuning from 70 to 110 Mhz 

Clear, concise step-by-step instructions 

Plenty of speaker volume 

Handy SCA demodulator output 

Lots of helpful hints and hook-ups

 

Содержание FR1

Страница 1: ...tes sports etc Typical uses for the FR1 FM radio receiver Tuning in hidden FM wireless mikes and phone bugs Hooking up SCA adapters Learning how FM receivers operate Snooping around for clandestine tr...

Страница 2: ...nitor RAMSEY AMATEUR RADIO KITS HR Series HF All Mode Receivers QRP Series HF CW Transmitters DDF1 Doppler Direction Finder CPO3 Code Practice Oscillator QRP Power Amplifiers RAMSEY MINI KITS Many oth...

Страница 3: ...iption 5 Parts List 6 Building your kit 8 Testing and Alignment 12 Troubleshooting Tips 14 Other Hook ups 15 SCA output 16 Schematic Diagram 18 Ramsey Kit Warranty 19 KIT ASSEMBLY AND INSTRUCTION MANU...

Страница 4: ...elephone transmitters and the like It was not designed for Narrow Band FM transmissions NBFM as you would find on police and fire transmitters Ramsey offers a complete line of receivers for those serv...

Страница 5: ...d in carrier frequency variations and not in amplitude changes like AM which would be susceptible to noise and interference This means that we can limit or clip the signal thus removing any noise and...

Страница 6: ...red black gold R19 3 270 ohm red violet brown R3 16 17 1 470 ohm yellow violet brown R6 2 1K resistor brown black red R2 18 1 2 2K ohm red red red R10 2 4 7k ohm yellow violet red R1 15 5 10K resisto...

Страница 7: ...install always means these steps 1 Pick the correct part value to start with 2 Insert it into the correct PC board location 3 Orient it correctly follow the PC board drawing and the written directions...

Страница 8: ...e manner as above 6 Install S1 the on off pushbutton switch Solder all six pins firmly We ve installed some landmark parts so far just to get us used to soldering our PC board These parts also will gi...

Страница 9: ...band Orient the band as shown on the layout diagram A Zener diode acts as a voltage regulator keeping the voltage across it constant This keeps frequency drift to a minimum 20 Install C6 100 pf disc...

Страница 10: ...let brown 38 Install Jumper JMP2 using a scrap component lead 39 Install C18 01 uf disc capacitor marked 01 or 103 or 10 nf 40 Install FL1 the 10 7 Mhz ceramic IF filter This part looks like a disc ca...

Страница 11: ...ip has 14 pins be especially careful not to bend any pins under as you insert it into the PC board When you solder the chip verify that you are soldering all 14 pins 59 Install R1 4 7K ohm yellow viol...

Страница 12: ...to have the tool fit loosely rather than too tight since a tight tool will cause stress on the delicate slug 1 Connect the following Fresh 9 volt battery preferably heavy duty alkaline type Speaker or...

Страница 13: ...being able to determine if it is in front of or behind you Readjusting L1 will correct this situation Make sure the slug is about three turns from the top of the coil form 11 Calibrating the receiver...

Страница 14: ...e anode or cathode of the LED but the anode side MUST go to DC with the cathode connected to the nearest common ground point If you are wondering why we did not include these pennies worth of parts wi...

Страница 15: ...polarity or excessive voltages WILL damage your kit DIGITAL READOUT A novel hook up is to add a general purpose frequency counter such as the Ramsey CT 90 to give a direct readout of oscillator frequ...

Страница 16: ...per the received frequency SCA OUTPUT The SCA output is a baseband demodulated signal output before any low pass filtering or de emphasis It provides a handy connection point for add on SCA adapters s...

Страница 17: ...ineligible for factory repair Make sure the receiver is working properly and that you understand how to use and repair it BEFORE making any changes in the original design If you ve enjoyed building t...

Страница 18: ...FR 1 18...

Страница 19: ...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 20: ...s Quality Electronics Kit was designed and packed in the USA REQUIRED TOOLS Soldering Iron Ramsey WLC100 Thin Rosin Core Solder Ramsey RTS12 Needle Nose Pliers Ramsey MPP4 or RTS05 Small Diagonal Cutt...

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