Well, it might, but I'm not 100% sure how to determine the lengths and
widths of the microstrips. (On my present project, I'm trying an open
1/4 wavelength 50 ohm stripline that I can trim down in length in an
attempt to make that line a "short" at the 2nd harmonic.)

The filter only needs to pass from about 1296 to 1300 MHz. I like the
idea of a helical filter (except for the cost!) with steep skirts and
since my I.F. will be 432 MHz, it will be far enough away so the image
will be quite a ways removed and should be way down in level after the
filter.

Scott
N0EDV

Tim Wescott wrote:




Why not a microstrip filter? Is it that you must have response from DC
all the way to 1296? Would a "no-tune" bandpass filter be more
appropriate?