BFR91-BFR96(S)-2SC1971 6 Watts FM broadcast (87,5-108MHz) Profline Broadband RF-amplifier

All component values are drawn on the .comp and .silklayer bitmaps, with the following
exceptions;

1.- mount a ferroxcube bead (3 mm diameter, 5 mm length) over one of the wires of the 56E 
    resistor (i.e. the wire wich is connected to the base of the 2SC1971 rf-transistor)
2.- the 1uH and 4.7uH coils are ready-made molded type coils.
3.- resistor values are in Ohms, 0.25watts (carbon or metalfilm).
4.- the 47E adjustable resistor measures 10mm diameter, vertical mount (Piher).
5.- all capacitor are ceramic except the 10nF and 100nF ones, these are multilayer types.
6.- the two trimmer capacitors are 22pF, Green (Philips).
7.- the two 150E resistors (at the collector of the BFR96(S) are mounted vertically.

(I)  make sure to mount the rf-transistor on a appropriate heatsink and use some thermal
     heatsink compound between the flange of the rf-transistor and the heatsink or cabinet!
     (Thermal resistance heatsink at least 6°C/W.)
(II) all parts are soldered directly on the toplayer of the pcb. 

NOTE: on several places connect the groundplane (bottomlayer) to the groundplane on the 
      toplayer, choose at will.

Happy constructing!

(C)2006 Helix. The Netherlands.

URL  : http://groups.yahoo.com/group/lpfm-pirate_radio/
 email: tri0de@hotmail.com

NOT TO BE USED FOR COMMERCIAL PURPOSES!

