Ramsey Electronics FR146 manual Parts List

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PARTS LIST

Inductors

ˆ2 small 1 1/2 turn coils (L1,L2)

ˆ1 slug-tuned 3 1/2 turn coil [orange color] (L3)

ˆ1 shielded transformer coil [marked LB 53303] (L4)

Semiconductors and IC's

ˆ1 2SC2498 or 2SC2570A transistor (Q1)

ˆ3 2N3904 transistor (Q2,Q3,Q4)

ˆ1 SA602 8-pin IC (U1)

ˆ1 MC3359 18-pin FM receiver IC (U2)

ˆ1 LM386 8-pin audio amplifier IC (U3)

ˆ1 Varactor diode, BB505 [orange body marked BB505] (D1)

ˆ1 1N4148 signal diode (D2)

Special Components

ˆ1 10.24 MHz Crystal (Y1)

ˆ1 10.7 MHz ceramic filter [brown, molded, 3 leads] (FL1)

ˆ1 450 KHz ceramic filter [black, square] (FL2)

Fixed Resistors

ˆ1 2 ohm [red-black-gold] (R22)

ˆ3 270 ohm [red-violet-brown] (R6,9,20)

ˆ1 470 ohm [yellow-violet-brown] (R5)

ˆ2 1K ohm [brown-black-red] (R11,12)

ˆ3 10K ohm [brown-black-orange] (R7,17,19)

ˆ1 18K ohm [brown-gray-orange] (R18)

ˆ1 33K ohm [orange-orange-orange] (R14)

ˆ4 47K ohm [yellow-violet-orange] (R4,8,13,21)

ˆ1 100K ohm [brown-black-yellow] (R16)

ˆ1 470K ohm [yellow-violet-yellow] (R15)

ˆ1 1 megohm [brown-black-green] (R10)

Capacitors

ˆ1 8.2 pF (C12)

ˆ2 10 pF (C2,5)

ˆ2 15 pF (C9,10)

ˆ1 22 pF (C19)

ˆ2 56 pF (C3,4)

ˆ3 100 pF [marked 100, 101, or 101K] (C1,6,22)

ˆ1 220 pF [marked 220 or 221] (C18)

ˆ7 .001 uF [marked .001 or 102 or 1 nF] (C7,8,11,20,23,24,25)

ˆ8 .01 uF [marked .01 or 103 or 10 nF] (C13,16,17,21,26,28,29,31)

ˆ1 .1 uF [marked .1 or 104] (C34)

ˆ1 1.0 uF electrolytic (C27)

FR146 • 6

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Contents Meter FM Receiver KIT Partial List of Available Kits Ramsey Transmitter Kits FR146 2 Meter FM Receiver KIT Introduction to the FR146 FM Receiver Building Your FR146 KITFR146 Circuit Description Parts List Semiconductor Replacement Data Controls and HardwareREQUIRED, not Supplied FR146 Block Diagram FR146 Parts Layout Diagram Ramsey Learn-As-You-Build KIT Assembly For Each PART, OUR Word Install Always Means These StepsFurther Component Installation SA602 OSCILLATOR-MIXER and Varactor TuningAntenna Input and Tuned RF Preamplifier FR146 FR146 FR146 Progress Summary MC3359 FM IC and Associated Components Final Connections the LM386 Audio IC Stage TESTING, Alignment and Adjustment Alignment ProcedureAdding AN LED Power on Indicator Receiver SensitivityRamsey Electronics CASE, Knob & Hardware Option FR146 Troubleshooting Hints Some Notes for Advanced UsersFR146 Ramsey Kit Warranty Total Solder Points Estimated AssemblyRequired Tools Time

FR146 specifications

The Ramsey Electronics FR146 is a versatile RF transmitter that has gained popularity among hobbyists and professionals alike for its reliability and performance. This compact and efficient device operates in the 146 MHz frequency range, making it suitable for various applications, including remote control systems, wireless audio, and telemetry. Its lightweight design and user-friendly interface make it an excellent choice for both beginners and seasoned RF enthusiasts.

One of the standout features of the FR146 is its ability to deliver a stable and clean signal. It employs advanced modulation techniques to ensure high-quality transmissions, minimizing interference and distortion. The device supports AM modulation, which is ideal for long-range communication due to its excellent propagation characteristics. This feature is particularly useful in outdoor environments where signals can travel considerable distances.

Another significant advantage of the FR146 is its user-adjustable output power. Users can easily modify the transmitter's power settings to suit specific needs, whether they require low power for short-range applications or higher power for extended reach. This flexibility allows for greater versatility in operation and makes it suitable for various scenarios.

The FR146 also comes equipped with a built-in tone generator, which can be used to encode audio signals. This feature allows for the integration of sound with the RF transmission, making it a perfect choice for projects that require audio broadcasting. Furthermore, the device includes a frequency stabilization circuit, ensuring that the transmitter maintains a consistent frequency even under varying temperature and voltage conditions.

In terms of construction, the FR146 is designed for durability and ease of use. It features a robust enclosure that protects the internal components from environmental factors. The device is straightforward to set up, often requiring only a few simple connections for operation. Its lightweight design enables easy mobility, making it suitable for portable applications.

Overall, the Ramsey Electronics FR146 stands out for its combination of advanced features, robust performance, and ease of use. Whether you are working on a personal project, conducting experiments, or managing professional tasks, the FR146 offers a reliable and effective solution for your RF transmission needs. Its adaptability across different applications makes it a valuable addition to any electronics enthusiast's toolkit.