Sinclair MTV1 service manual V2.1 Page 11 of 39
VHF Tuner
Thi
s comprises of input tuned circuit, RF amplifier, tuned bandpass circuit, mixer and local
oscillator. All transistors are silicon bipolar. Tuning is by varicap diodes. Band switching is by PIN
diode. The mixer stage acts as an Intermediate Frequency (IF) amplifier when the set is receiving
Bands IV and V (UHF). AGO and AFC are applied as in the UHF tuner.
Circ
uit diagram for reference only; it is suggested you refer to the original later in this document.
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