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FM35



DIGITAL FM STEREO

TRANSMITTER

Ramsey Publication No. FM35

Manual Price Only $5.00

TABLE OF CONTENTS

Introduction

.......................................... 4

Circuit

Description

...............................

FM35

Setup

.......................................

FM35 Schematic Centerfold .............. 12

Antenna

Ideas

...................................

Appendix A: FCC Rules and Info ...... 16

Appendix

.......................................

Summary

...........................................

Warranty

............................................

INSTRUCTION MANUAL FOR

RAMSEY ELECTRONICS, LLC

590 Fishers Station Drive

Victor, New York 14564

Phone (585) 924-4560

Fax (585) 924-4555

www.ramseykits.com

Содержание FM35

Страница 1: ...rols for easy audio level adjustments Runs from 13 8 16VDC includes 15V DC adapter Quality of signal indicator lets you know when you have a good signal or over modulated signal Lets you know when to...

Страница 2: ...RADIO KITS HR Series HF All Mode Receivers DDF1 Doppler Direction Finder Kit QRP Series HF CW Transmitters CW7 CW Keyer QRP Power Amplifiers RAMSEY MINI KITS Many other kits are available for hobby sc...

Страница 3: ...duction 4 Circuit Description 5 FM35 Setup 10 FM35 Schematic Centerfold 12 Antenna Ideas 14 Appendix A FCC Rules and Info 16 Appendix B 18 Summary 20 Warranty 23 INSTRUCTION MANUAL FOR RAMSEY ELECTRON...

Страница 4: ...th the transmitting range low noise audio quality frequency stability and stereo channel separation of this build it yourself synthesized FM stereo transmitter If you use your FM35 in accordance with...

Страница 5: ...case to regulate to 12V VR1 only needs about 0 8V across it this means it can regulate 12 8V and up C9 is used in conjunction with VR1 for good regulation of the 12V The 12V is then fed to VR2 a stand...

Страница 6: ...on pin 2 our reference the state of the output pin 1 of U5 A goes high 5V If the voltage on pin 3 goes below that on pin 2 the output goes low 0V The comparator is set up with these specific diodes a...

Страница 7: ...r circuit which works in conjunction with the external parts of D5 and the STUB that weird trace on the back of the board D5 is called a varactor diode and is a special variety of diode that is connec...

Страница 8: ...tor useless U6 corrects the tuning sensitivity by acting like a variable pot based on the tuning voltage As the tuning voltage applied to D5 goes down the microcontroller U3 adjusts U6 based on transm...

Страница 9: ...ere in one simple project digital power RF and analog If you want more information on these subjects there are a lot of great electronics books and websites out there and here are some keywords to sea...

Страница 10: ...lock Readjust your con trast now if you need to Pressing the SETUP button once brings us to the frequency display Here using the UP DOWN buttons we can select our frequency of operation Note the volta...

Страница 11: ...kHz C 90kHz Remember from the circuit description that the indicator doesn t specify the exact level but the frequency with which the audio signal surpasses approxi mately 60kHz of deviation The indic...

Страница 12: ...FM35 12 FM35 SCHEMATIC CENTERFOLD...

Страница 13: ...FM35 13...

Страница 14: ...rt will be concen trated on smoothly managing or mixing the audio signals fed into the trans mitter input Operation of the transmitter itself consists simply of the following 1 Carefully checking for...

Страница 15: ...asurements required by Part 15 FCC rules and if you think it would be best to aim or focus your signal in a narrower direction you can consult an antenna handbook and design a suit able gain antenna S...

Страница 16: ...sa are accepted In the United States this is how the FCC regards your transmitter kit Licensed FM broadcast stations and their listeners have ALL the rights Your use of a device such as the FM35 kit M...

Страница 17: ...ef fect prior to June 23 1989 2 It is the sole responsibility of the builder user of any FM broadcast band device to research and fully avoid any and all interference to licensed FM broadcast transmis...

Страница 18: ...of 88 108 MHz FM Broadcast band unlicensed operation is that the field strength of the signal must not ex ceed 250 microvolts meter at a distance of 3 meters from the transmitter FCC rule 15 239 If y...

Страница 19: ...hese circular boundaries toward the antenna This exercise in meters and microvolts demonstrates that the FCC clearly intends to limit the theoretical range of non licensed devices operating in this ba...

Страница 20: ...covering a circular area of about 114 acres A quick glance at stereo FM receiver specifications shows typical sensitivity of 1 7 V before considering high gain antennas or preampli fiers Your non lic...

Страница 21: ...perate fully and promptly 7 Do your own homework and research to understand and comply with pre sent and future FCC rulings concerning devices of this kind 8 Do not use made up station call signs to i...

Страница 22: ...l 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 down...

Страница 23: ...ctory for a full refund less shipping The return package should be packed securely Insurance and tracking is highly recommended A reminder this applies to unassembled kits They must be in the same new...

Страница 24: ...dix A FCC Rules and Info 16 Appendix B 18 Summary 20 Warranty 23 RAMSEY ELECTRONICS LLC 590 Fishers Station Drive Victor New York 14564 Phone 585 924 4560 Fax 585 924 4555 www ramseykits com Manual Pr...

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