Input band filters circuit for TV receiver - has common inductance, acting as oscillation circuit inductance for filters

摘要

At least two input filters have each oscillation inductances (12), individually associated with each band pass filter. At least one common inductance (31) is effective for at least two input band pass filters as the oscillation circuit inductance. The common oscillation circuit inductance is pref. in series with the indivudal oscillation circuit inductances (12,32,33) of the input band pass filters, in which it is effective. An individual oscillation circuit inductance (32) may be provided in at least one band pass filter. USE/ADVANTAGE - TV receivers with tunable filters for VHF bands I and III. Compact design of coils.