• on Audio/Video/Photography
  • Published in issue 7/2001 on page 0
About the article

Booster for Cable Radio

With the aid of this circuit it is possible to listen, using a portable VHF FM radio, to listen to stations that transmit only your local cable network. Both from its properties and its design this ‘cable booster’ appears similar to an antenna amplifier, because this is a two-stage amplifier with two common RF transistors type BF199. Only this time, the input is connected to the cable connection instead of an antenna while the output does not contain a coaxial connection but a tuned circuit that acts as impedance matching for a 1/4?-antenna.
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Products
Resistors:
R1 = 100Ohm
R2,R6 = 470Ohm
R3,R7 = 10kOhm
R4,R8 = 1kOhm
R5,R9 = 220Ohm
Capacitors:
C1,C3,C4,C6 = 1nF
C2,C5 = 47pF
C7 = 100pF
C8 = 30pF trimmer capacitor
Inductors:
L1 = 3 turns 1mm dia. ECW, internal dia. 8mm, tap at 1 turn
Semiconductors:
T1,T2 = BF199
Miscellaneous:
K1 = coax socket, chassis mounting
ANT1 = telescopic or whip antenna, length approx. 75cm
9V battery with holder and wires
Diecast enclosure
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