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Ramsey Electronics FM25B, Сборка и инструкция по эксплуатации

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Ramsey Electronics FM25B Скачать руководство пользователя страница 33

FM25B 

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 33  

 

Содержание FM25B

Страница 1: ...ration than the original New design features Line In and Loop Out 1 8 Stereo jacks F style RF output connector for easy connection to an external antenna Fully adjustable RF output level for custom co...

Страница 2: ...Doppler 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 f...

Страница 3: ...Custom Case Assembly 20 Choosing an Operating Frequency 20 Adjusting 21 Home Use 23 Projects 23 Antenna Ideas 24 Troubleshooting 25 FCC Rules and Information 26 Understanding Field Strength 29 Summary...

Страница 4: ...uency stability and stereo channel separation of this build it yourself synthe sized FM stereo transmitter If you follow our assembly directions carefully and use your FM25B in accordance with applica...

Страница 5: ...filtered power source The capacitive multiplier formed by Q1 R4 and C4 together make a handy low loss ripple filter by in effect multiplying C4 s capacitive value by the DC current gain of Q1 This in...

Страница 6: ...site audio signal causing the VCO to deviate from its base frequency This is how we get our FM Frequency Modulation signal By using a dual varactor diode modulation scheme we can achieve a very tight...

Страница 7: ...itching the output back and forth from High to Low The resulting effect is to smooth the response of the LED D1 indicator making it more pleasant to the eye The detection circuit formed by U1 will ind...

Страница 8: ...ntrol voltage on D8 As the voltage across the varactor increases it causes a decrease in capacitance Increasing re verse bias essentially increases the distance between the capacitor s plates by incre...

Страница 9: ...FM25B 9 FM25B PARTS LAYOUT DIAGRAM...

Страница 10: ...30 1 47 uF electrolytic capacitor C8 2 100 F electrolytic capacitor C3 4 1 1000 F electrolytic capacitor C32 4 1 uF SMT capacitors C16 17 Preinstalled Resistors 1 10 ohm brown black black R1 1 100 ohm...

Страница 11: ...eads 3 on one side U4 Preinstalled 1 Two pin jumper and jumper block J1 1 F type board mount connector J3 2 3 5mm stereo jacks J4 5 1 2 1mm DC power jack J2 1 DPDT push button switch S4 3 DIP switches...

Страница 12: ...ntenna as faithfully as is practical as part of Ramsey s Learn As You Build kit assembly philosophy FM25B ASSEMBLY Use the boxes to check off your progress Check all received parts against the Parts l...

Страница 13: ...agnifier You know what I m talking about your arms just don t get long enough to read the writing on these babies Can you tell I might have some personal experience with this 1 Locate the BH1415F ster...

Страница 14: ...ponents to your PC board to make general orientation around the board much clearer for installing additional parts Most of the resistors will be installed in a stand up fashion That is one lead will g...

Страница 15: ...C37 75 pF disc capacitor marked 75 or 75K 24 Install C38 47 pF disc capacitor marked 47 25 Install L4 a prewound spring style inductor 26 Install L2 the other prewound spring style inductor 27 Install...

Страница 16: ...F 42 Install R23 220k ohms red red yellow 43 Install C15 10 pF disc capacitor marked 10 or 10K 44 Install C13 001 F disc capacitor marked 001 102 or 1nF 45 Install D8 MV2105 varactor diode transistor...

Страница 17: ...e installed backwards will make it im possible to transmit on some frequencies while having no effect on others Makes for interesting troubleshooting Don t worry hardly anyone messes this one up so we...

Страница 18: ...is lead is shorter than the other one too Place the part so that the flat side lines up as shown on the silk screen Leave the leads long the part should sit up about an inch off the board so that you...

Страница 19: ...ot more trouble later Unless you like the smell of smoke and the sound of things exploding It s worth the few extra minutes Looking over the PC board is the first step our Ramsey technicians complete...

Страница 20: ...pro gram DIP switches S3 S2 and S1 for the frequency desired The DIP switches are programmed in BCD a form of binary that is very easy to use Look at your circuit board or parts layout diagram you ll...

Страница 21: ...t level potentiometers R27 R28 to about half of their rotation This is a good starting position The best audio input for both testing and general operation are the stereo line level outputs of a casse...

Страница 22: ...arefully checking for an open frequency between 88 108 MHz in accor dance with FCC Rules Part 15 3 Setting up a suitable antenna 4 Connecting the audio source to the input jack 5 Turning on the transm...

Страница 23: ...ement The di pole formula is also used to calculate the length of the radial since radials should be slightly longer than the main element use 240 rather than 234 in your calculations If you are equip...

Страница 24: ...oard layout diagram correct polarity of all electrolytic capacitors correct orientation of diodes D1 D17 correct orientation of Q1 Q2 and Q3 transistors all parts are installed as close to the printed...

Страница 25: ...o 199 The cost is 24 00 Master Card and Visa 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 Y...

Страница 26: ...m c There are no restrictions on the operation or marketing of equipment complying with the regulations in ef fect prior to June 23 1989 2 It is the sole responsibility of the builder user of any FM b...

Страница 27: ...broadcasting sta tion or to use it for any other non interfering practical application c FCC Rule 15 5 General conditions of operation b Operation is subject to the conditions that no harmful interfer...

Страница 28: ...V In contrast non licensed operation from 26 96 to 27 28 MHz is limited to a field strength of 10 000 V per meter at 3 meters In all cases the field strength of a signal decreases in direct proportion...

Страница 29: ...with broadcast reception can easily involve hundreds of homes before adding apartments In fact the most significant distance in the above chart is the 1 9 V signal strength permissible at 1260 feet a...

Страница 30: ...ses of the radio spectrum Lawful use suggestions 1 Build and adjust this kit strictly according to the published instructions 2 Use the whip antenna supplied with the Ramsey case set CFM 3 Do not modi...

Страница 31: ...mful interference and 2 This device must accept any interference received including interference that may cause undesired operation Final comment A well informed person will see today s FCC Rules to b...

Страница 32: ...and school community groups as never before in radio com munications history Learn the rules observe them and have fun in radio If you enjoyed this Ramsey kit there re plenty more to choose from in ou...

Страница 33: ...FM25B 33...

Страница 34: ...FM25B 34...

Страница 35: ...h 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...

Страница 36: ...tic Diagram 33 Warranty 35 TOTAL SOLDER POINTS 326 ESTIMATED ASSEMBLY TIME Beginner 10 hrs Intermediate 6 hrs Advanced 4 hrs RAMSEY ELECTRONICS INC 590 Fishers Station Drive Victor New York 14564 Phon...

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