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FM STEREO 

TRANSMITTER 

Ramsey Electronics Model No.           FM10A 

 

Great for transmitting your tape deck or CD player throughout the 
house, yard or even your car. 

Powerful enough for college or neighborhood radio stations - in 
use all over the world. 

Fantastic audio quality sounds better than most stations on the 
dial.  And we’ll tell you why! 

Easily connects to the line-level outputs on any tape deck, stereo 
system or CD player. 

Some users hook up one channel to the scanner and the other to 
their two way radio.  Now you can hear what’s going on around 
town up to several blocks away from your house with a simple 
stereo receiver... and adjust the volume of each individually with 
your balance control! 

Add a mike-mixer and tape or CD deck for a “PRO” sounding radio 
station. 

Operates on 1.5 to 15 volts, using a crystal controlled subcarrier. 

Tunable anywhere in the 88-108 MHz FM band. 

Clear, concise instructions guide you step by step. 

Own and operate your own FM Stereo broadcast station.  
Definitely not a toy, the FM-10A has an exceptional transmission 
range... and the audio quality puts your favorite radio station to 
shame.  See why this is one of our most popular kits! 

Summary of Contents for FM10A

Page 1: ...r to their two way radio Now you can hear what s going on around town up to several blocks away from your house with a simple stereo receiver and adjust the volume of each individually with your balan...

Page 2: ...KITS FX 146 VHFTransceiver 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...

Page 3: ...ng Frequency 13 Adjusting your FM10A 14 Using your FM10A Within the Home 15 Power Supply Considerations 15 LED Power On Indicator 15 Experimental Broadcasting Projects 16 Antenna Ideas 17 Troubleshoot...

Page 4: ...y frequency stability and stereo channel separation of this build it yourself FM stereo transmitter If you follow our assembly directions carefully and use your FM10A in accordance with applicable FCC...

Page 5: ...justment of input level Resistors R3 and R6 set the pre emphasis characteristics 75uS for USA and 50uS for Europe R7 permits adjustment of stereo balance L1 and C16 form an adjustable resonant circuit...

Page 6: ...brown R9 R13 1 470 ohm yellow violet brown R8 1 4 7K ohm yellow violet red R11 3 10K ohm brown black orange R3 R6 R10 2 15K ohm brown green orange R3 R6 1 150K ohm brown green yellow R12 1 100K yellow...

Page 7: ...ck or CD player External antenna small gauge coax and RCA plug OR PC board mounted telescoping whip antenna included with the Ramsey CFM case and knob set OPTIONAL Ramsey FM10A case and knob set CFM o...

Page 8: ...in this FM10A stereo transmitter we try to make a reasonable compromise between following the signal path and just getting all parts in properly so you can enjoy your kit as soon as possible So you ca...

Page 9: ...t supplied with your kit There is no right or wrong direction to this socket but the U1 IC itself certainly needs to be inserted correctly later Taking care of this socket early in the project will he...

Page 10: ...ase the high frequency signal to noise ratio If you desire a brighter sound you may use the 10K ohm resistors rather than the 15K ohm parts 11 Install R3 15K brown green orange 12 Install R6 15K brown...

Page 11: ...ow violet brown 29 Install C20 001 F marked 001 or 102 or 1 nf RF amplifier and final components 30 Install shielded slug tuned coil L1 The larger tabs secure the shield can to the ground foil connect...

Page 12: ...C6 001 F marked 001 or 102 or 1 nf 43 Install C8 10 pf marked 10 or 10K 44 Install C7 10 pf marked 10 or 10K 45 Install Y1 the small silver can crystal Be especially careful when installing this part...

Page 13: ...e low end of the FM broadcast band 88 92 MHz where there are numerous medium power National Public Radio stations perhaps outside your own town but which your neighbors may enjoy receiving using a goo...

Page 14: ...variety of auxiliary output jacks of which one or more are line level outputs Hooking up an audio source to your FM10A is really quite simple However there are some general rules A terribly distorted...

Page 15: ...U1 at 2 1 volts Note however that reduced voltage will also affect the collector voltage and therefore the output power of Q1 Whether an alternative AC adapter can be used depends on the quality of t...

Page 16: ...ch is at the heart of any studio operation is beyond the purpose of this instruction manual We do recommend that you design and build this mixing system yourself for several reason 1 Parts to do so ar...

Page 17: ...oximate dipole such as 2 5 ft on a side will do fine while others believe it is worth the effort to calculate the length for your exact frequency using the simple formula of Length of one side in feet...

Page 18: ...pt such an installation unless you know exactly what to do and not to do Also because such an installation is beyond the original purpose of this kit and the safety standards intended for all Ramsey k...

Page 19: ...ment ask for CFR Title 17 Parts 1 to 19 The cost is 24 00 Master Card and Visa accepted In the United States this is how the FCC regards your transmitter kit Licensed FM broadcast stations and their l...

Page 20: ...ob of finding a clear frequency if one is available 3 For some frequency bands the FCC sets 100 milliwatts 0 1 watt as the maximum permitted power output for unlicensed home built transmitting devices...

Page 21: ...no harmful interference is caused and that interference must be accepted that may be caused by the operation of an authorized radio station by another intentional or unintentional radiator by industri...

Page 22: ...tance the signal power is quartered but the field strength voltage is only halved Using this theory we can construct a simple chart to show the maximum permitted performance of a non licensed FM band...

Page 23: ...asily and legally serve a school campus or wilderness campground 3 And if we remember that typical urban single family home sites run from 1 4 to 1 2 acre on the average it should become extremely cle...

Page 24: ...s does not provide detailed guidance on ALL aspects of using a low power transmitter such as the FM10A The main point is that you may not cause any interference whatsoever to licensed broadcast servic...

Page 25: ...toughest about clandestine transmission which cost time and money to track down 10 Do not assume that the mere fact that you purchased this kit gives you any specific right to use it for any purpose b...

Page 26: ...anual will show you many legal uses of radio transmitting devices which do not require licensing either amateur or commercial To provide more personal and club radio learning opportunities and to cut...

Page 27: ...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 pr...

Page 28: ...l Cutters RS64 1845 OR Complete Soldering Tool Set RS64 2801 ADDITIONAL SUGGESTED ITEMS Soldering Iron Holder Cleaner RS64 2078 Holder for PC Board Parts RS64 2094 Desoldering Braid RS 2090 TOTAL SOLD...

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