That's exactly what I'm trying on my present project at 902. I have a
50 microstrip line on the circuit board where the RF connector hooks up.
I will etch it to be a 1/4 wavelength at 1802 MHz (2nd harmonic) and
see how that works. If it works OK, I may try the same at 1296...I
might also go with a helical filter...they work nice but can be a bit
pricey!

Scott
N0EDV

K7ITM wrote:


Also, if the goal is to kill harmonics of a
single narrow band, you may do better with notches at the harmonic
frequencies.

Cheers,
Tom