Richard Lee
Member
http://www.changpuak.ch/electronics/index.php
Here you can find an on-line filter calculator, for a bunch of different types of filters.
I like this one, since I own and old 838 Mhz inter-digital filter(cell-phone?) that may be hackable to 1090.
http://www.changpuak.ch/electronics/interdigital_bandpass_filter_designer.php
Hams build this type of filter in a factory made box, or they DIY with copper cad PCB stock, soldered into a box shape.
They use 1/2" copper water pipe for the resonators.
Here you can find an on-line filter calculator, for a bunch of different types of filters.
I like this one, since I own and old 838 Mhz inter-digital filter(cell-phone?) that may be hackable to 1090.
http://www.changpuak.ch/electronics/interdigital_bandpass_filter_designer.php
Hams build this type of filter in a factory made box, or they DIY with copper cad PCB stock, soldered into a box shape.
They use 1/2" copper water pipe for the resonators.
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