Two half-wave resonators with binary-programmed, high-speed electronic tuning have been cascaded to form a second-order high-power bandpass filter for the range 355 to 400 MHZ. Seven binary-scaled, PIN-diode-controlled, tuning irises in each resonator provide a maximum tuning increment of 550 kHz while the tracking error never exceeds 150 kHz. Intensive improvements were made in design and performance, and in automatic control and testing, over previous work with a single resonator of more primitive design.

Recent Advances in Binary-Programmed Electronically-Tunable Bandpass Filters of the "Flauto" Type

A system is described that automatically and rapidly measures the electrical parameters for each channel in a multichannel digitally tuned bandpass filter. The performance of the filter over its entire tuning range is determined from the individual channel frequency characteristics. Channel frequency characteristics are displayed to summarize the overall performance of the filter and in such a manner as to indicate the channel tuning adjustments necessary to meet the filter specifications.

William B. Weir

Papers

Automatic Measurement System for a Multichannel Digitally Tuned Bandpass Filter