Ramsey Electronics FT146 Winding L3 and L4 Use the same wire, Viewed from the top, Turns through

Page 13

stages of your transmitter. We recommend that you get them ready for installation before assembling the Driver and Final stages. If you prefer to proceed with those stages, winding coils as you go, that's fine, too, as long as you realize that all coil making details are provided in this section.

The wire used for L1, 6, 10, and 12 is the smaller gauge enameled wire supplied with your kit. We give you plenty but if you mess up, you can get a whole 50' spool of it from Radio Shack (278-1341).

❒76. Winding L1 and L6 RF chokes (two identical units ): Examine the two cylindrical ferrite cores provided in the kit.Notice that there are six holes at either end of these cylinder shaped units, arranged in two groups of three. Cut 6" of bus wire and following the drawing, thread the wire, pulling each turn gently tight. Tin each end with solder by holding your soldering iron and solder on the wire ends until the enamel insulation melts away and the copper wire underneath coats nicely with solder. Tin all the way up to the ferrite core body. Your finished RF chokes should look like this: Do not install either part yet.

❒77. Winding L10 and L12: Locate the two small black ferrite beads provided in the kit. Cut 2" of enameled wire and following the drawing, thread 3 turns through the bead hole, pulling each turn "gently tight." Tin each end with solder. Tin all the way up to the ferrite core body. Your finished bead chokes should look like this: Do not install either part yet.

❒78. Winding L2 and L7: Use the heavy gauge tinned bus wire in your kit for these coils. Wind these coils on the threads of the provided 5/16"X20 bolt to assure perfect forming of the coils. (You wondered what that big bolt was for - didn't you!) Both coils are 11/2 turns. They appear to be 2 turns if viewed from the top. They will fit neatly into the PC board without any excessive bending or stretching.

❒ 79. Winding L3 and L4: Use the same wire and

6 hole ferrite

procedure as used above for these coils. Each coil

core

is 2 1/2 turns and will appear to be 3 turns if

 

viewed from the top.

 

 

enameled wire

 

tin ends

 

3 turns through

 

center

 

enameled wire

 

tin ends

FT146 • 13

Page 12 Page 14
Image 13
Page 12 Page 14
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 Semiconductor devices Inductors and ferrite coresSpecial components Required, not suppliedRamsey Learn-As-You-Build KIT Assembly FT146 FT146 FT146 Resisto Test point loopPC board Procedure as used above for these coils. Each coil Winding L3 and L4 Use the same wireEnameled wire Is 2 1/2 turns and will appear to be 3 turns ifFT146 FT146 Wire jumper Wire sits flat FT146 Short lead here TESTING, Alignment and AdjustmentFT146 Verifying Transmitter RF Output Your Power Supply and RF Output PowerFT146 Troubleshooting Hints Maximizing RF Power OutputMicrophone Considerations Crystal Requirements Other Enclosure RecommendationsFT146 FT146 Parts Layout Diagram Ramsey Kit Warranty Required Tools Estimated AssemblyTotal 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.
Top Page Image Contents