| http://www.w3.org/ns/prov#value | - Namely, the amplifier apparatus for converting the original frequency to the IF band. [0014] However, in case the amplifier apparatus has been made to have such a construction as illustrated in FIG. 4, the band pass filter 14 or 16 for passing the IF frequency band has a center frequency of its pass band shifted due to a change in the ambient temperature.
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