Ramsey Electronics FT146 manual Wire jumper Wire sits flat

Page 16

The "legs" or leads for inserting L2, L7, L3 and L4 should be about " long. These coils should sit about 1/8" maximum above the PC board when soldered.

❒ 80. Install L12, one of the small 3 turn ferrite bead RF chokes you wound. Pull it up snug against the PC board and solder.

❒ 81. Install TP2, another test point. Select a 1K resistor, R2 (brown-black- red). Trim back one lead wire to a length of inch. Bend this wire into a small loop as shown. This loop acts as a convenient point to connect a test probe for tuning up your transmitter. Insert the resistor into the PC board

and hold it carefully while you solder it to

 

 

 

 

 

Test point loop

the board.

 

 

 

 

 

 

 

 

 

 

❒ 82. Install C18, 22 pf disc capacitor

Resistor

 

 

PC board

 

 

(marked 22 or 22K).

 

 

 

 

 

 

 

❒83. Install C10, 47 pf disc capacitor (marked 47 or 47K).

❒84. Install Q5, 2N3866 metal can RF transistor. Be sure you press the transistor case flush against the PC board and solder securely.

❒85. Install L6, a 6 hole ferrite bead choke wound previously.

❒86. Install C4, .01 uf disc capacitor (marked .01 or 10 nf or 103).

❒87. Install L11, pink slug tuned coil.

❒88. Install aluminum shield can cover over L11.

❒89. Install C19, 10 pf disc capacitor (marked 10 or 10K).

❒90. Install C20, another 10 pf disc capacitor.

❒91. Install L7, a 1 turn coil wound previously. Ensure that the coil is seated flush against the PC board and not mounted with long leads up in the air - which would add undesired additional inductance.

❒92. Install C11, 100 pf disc capacitor (marked 100 or 101).

❒93. Prepare a inch long wire jumper from the heavy tinned bus wire used for winding coils previously. Install this jumper in the L8 location on the PC board. This wire must sit flat against the PC board and not up above.

Believe it or not, this wire is actually an inductor providing inpedance matching into Q6.

❒94. Install C26, 100 pf disc

capacitor (marked 100 or 101). Heavy buss

❒

95.

Install L10, small ferrite

wire jumper

Wire sits flat

(not a scrap component lead)

 

bead RF choke you wound

 

 

 

 

 

against board

 

earlier.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PC board

❒

96.

Install C6, 100 pf disc

 

1/2 inch

 

 

 

 

 

 

 

capacitor (marked 100 or 101).

FT146 • 16

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Contents Meter FM 5 Watt Transmitter KIT Ramsey Transmitter Kits FT146 FM Receiver KIT Introduction FT146 Circuit Description Capacitors FT146 2 Meter FM Transmitter KIT Parts ListResistors and potentiometers Inductors and ferrite cores Semiconductor devicesSpecial components Required, not suppliedRamsey Learn-As-You-Build KIT Assembly FT146 FT146 FT146 Resisto Test point loopPC board Winding L3 and L4 Use the same wire Procedure as used above for these coils. Each coilEnameled wire Is 2 1/2 turns and will appear to be 3 turns ifFT146 FT146 Wire jumper Wire sits flat FT146 TESTING, Alignment and Adjustment Short lead hereFT146 Your Power Supply and RF Output Power Verifying Transmitter RF OutputFT146 Maximizing RF Power Output Troubleshooting HintsMicrophone Considerations Other Enclosure Recommendations Crystal RequirementsFT146 FT146 Parts Layout Diagram Ramsey Kit Warranty Estimated Assembly Required ToolsTotal Solder Points Time

FT146 specifications

The Ramsey Electronics FT146 is a versatile and compact FM transmitter that stands out for its user-friendly operation and impressive performance in both amateur and professional audio applications. Designed for hobbyists, educators, and small businesses alike, the FT146 offers a reliable solution for broadcasting audio signals over a short to moderate range.

One of the main features of the FT146 is its simple plug-and-play setup, which allows users to get started quickly without needing extensive technical knowledge. The device operates with a frequency range of 88.1 to 107.9 MHz, covering the entire FM broadcast band. This flexibility enables users to choose the best frequency for minimal interference in their transmission area. Additionally, with an adjustable output power of up to 2 watts, the FT146 can effectively cover distances ranging from a few hundred feet to several miles, making it ideal for a variety of broadcasting scenarios.

The FT146 utilizes advanced modulation technology to ensure high-quality audio transmission. It supports monophonic audio, which is perfect for clear voice and music transmission. The integrated audio limiter prevents distortion, ensuring that the sound quality remains consistent, even at higher volumes or varying audio signals.

Another notable characteristic of the FT146 is its robust construction. Housed in a durable metal enclosure, the transmitter is built to withstand everyday use. The compact design allows for easy portability, making it suitable for field applications, on-location broadcasting, or as a permanent installation in a small venue.

In terms of connectivity, the FT146 features multiple audio input options, including a 3.5mm jack and RCA inputs. This versatility allows users to connect various audio sources, such as MP3 players, computers, or professional-grade audio equipment.

Furthermore, the FT146 also includes an LED power indicator and a built-in antenna output for enhanced transmission efficiency. Users can either connect an external antenna for increased range or utilize the included telescopic antenna for convenience.

Overall, the Ramsey Electronics FT146 combines ease of use with professional-grade features, making it an excellent choice for anyone looking to explore FM broadcasting. Whether for personal projects, educational purposes, or small business promotions, the FT146 delivers reliable performance and adaptability in a compact package.
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