28W power RF Amplifier FM Broadcast 88 108 MHz 2SC1946. 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 was 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 × 50 mm (width x height).
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.
Note:
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 an appropriate heat sink and use some thermal heat sink compound between the flange of the transistor and heat sink! (Thermal resistance heatsink at least 6 °C/W.)
Quantos volts para funcionar sem aquecer muito? grato.
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.
Hello Radiobuis
Thanks your feedback!
Can it function at lower frequencies, like 50mHz? And if so, will it’s output remain 10 to 30 Watt.
Hello Ray
You will have to calculate the capacitors.
ola montei um usando esse desenho mas transistor diferente 50wat
Hi. What about power supply?12 or 28 volts? Coil vk200-19/4b is available any replacement or just simple connecting (a piece of wire)?
Regards.
circuit is hard to understand.plz provide general circuit diagram.
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?
“28W power RF Amplifier for FM Broadcast 88-108 MHz 2SC1946”
i want this Board how many price in srilanka?
Pls i need the schematic for the 28w power rf amplifier.
circuit is hard to understand.plz provide general circuit diagram.
I agree! rssss
Hello Toni.
Can I have your e mail,skype and facebook psedo?
circuit is hard to understand.plz provide general circuit diagram.