Adopts micro computer controlling medium frequency and pll technology circuit high reliable filter and 1.9ghz mixer, match with band pass filter, good parasite output hybrid amplifier circuit, high rf output index, above 110dbuv

B: 48 to 550mhz,
C: 48 to 750mhz,
D: 48 to 870mhz

Adopts 20 figure lcd screen