Interdigital Bandpass Filter Drawings and Photos

Photos of a 1296 mhz filter from the Jan. 1985 issue of Ham Radio magazine. You can get the complete article on CDROM from the ARRL online store. See Ham Radio CD-ROM 1984-1990 #8411

A pdf file of photo copies of the article is here. A jpeg image of the original BASIC program is here.

4 Section IDBPF for TV channel 9 I built.
Bandwidth=6 MHZ Center Freq=189 MHZ
Rods are 3/8 inch aluminum rounds. Sides are 0.25x1.5 inch aluminum flats.
Top and bottom covers are 0.050 aluminum.

Frequency response of TV Channel 9 filter