0-44dB RF Attenuator

Anyone who has to reduce the amplitudes of RF signals in a controlled manner needs an attenuator. Linearly adjustable attenuation networks using special PIN diodes are available for this, but they require quite intricate control circuitry. A simpler solution is Continue reading

CB receiver

TECHNICAL CHARACTERISTICS: Tendency of catering: + 12V DC Frequency of reception at AM: ~27MHz Materially: The resistances are 1/4W. R1, R3, R5 100W R2 56KW R4 39KW R6 560W R7, R11 6,8KW R8 220W R9 2,2KW R10 5,6KW R12 10KW Continue reading

FM radio

TECHNICAL CHARACTERISTICS: Stabilised tendency of catering: Vcc=9~12V Frequency of reception: 88~108MHz Consumption: 100mA Materially: The resistances are 1/4W. R1 47K R2 22K R3 100K R4 39K R5 10 R6-r12 7,5K – Optionally R13-r21 15K – Optionally P1 10K Logarithmic potentiometer Continue reading

Active FM antena

Czesto odbiór stacji UKF FM odbywa sie za pomoca prowizorycznych anten w postaci odcinka przewodu dolaczonego do wejscia antenowego. Niski poziom sygnalu zwlaszcza w ?ekranowanych" zelbetonowych budynkach mieszkalnych czy biurach obniza jakosc odbioru. Zaradzic temu powinna proponowana do wykonania antena Continue reading