28W power RF Amplifier for FM Broadcast 88-108 MHz 2SC1946

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This RF Amplifier designed for FM broadcast using a single 2SC1946 VHF Power Transistor. This 10-30W RF amplifier circuit provides an appropriate power boost with an input of 1-3 watt. Tower are 30 meters high will send signal surrounding air should be around 15 km.

RF Amplifier Artwork
The layout of the 2SC1946 28 Watts FM broadcast RF amplifier has been created with sPRINT Layout v3.0. You can get a Shareware copy at: http://www.abacom.de. The pcb outline is 100 x 50 mm (width x height).

28W power RF Amplifier for FM Broadcast 88-108 MHz 2SC1946 pcb

28W power RF Amplifier for FM Broadcast 88-108 MHz 2SC1946

RF Amplifier Parts List
All component values are drawn on the .comp and .silklayer bitmaps, with the following exception(s);
all four (4) coils (in the lowpass filter section) are: 3.5 turns, 8 mm DIA., 1.2 mm CuL closewound i.e. no wirespacing.

CuL = magnetwire, enameled copper wire, insulated (rigid) copper wire e.t.c..
2 mm equals approx. to #12 A.W.G
1 mm equals approx. to #18 A.W.G
1.2 mm equals approx. to #17 A.W.G
0.8 mm equals approx. to #20 A.W.G
0.3 mm equals approx. to #28 A.W.G.)

  • all diameters are measured from the inside of the coils, i.e. ‘internal’ diameter.
  • make sure to mount the rf-transistor on a appropriate heatsink and use some thermal heatsink compound between the flange of the transistor and heatsink! (Thermal resistance heatsink at least 6°C/W.)

Source: http://www.3-mtr.info/shareware/Amplifier%2028Watt%20MicroStripline%20%282SC1946A%29/

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13 thoughts on “28W power RF Amplifier for FM Broadcast 88-108 MHz 2SC1946”

  1. What is hard to understand? Get the datasheet of the 2sc1946 and draw your own schematic, not that difficult! I’ve drawn this layout years ago, Broadcaster (Germany) build the amplifier and it works perfectly. It’s designed for the FM commercial broadcast band (87.5-108Mhz) NOT another frequency. You can replace the vk200 coils NOT with a single piece of wire, you’ll need ferrite material.

  2. Amb Case 2sc1946 28watts rf-

    Can the offset to its bare pcb?
    How to purchase in order to do this?
    What is its price?
    The procurement of the time?


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