I have been watching a few videos on APT sat decoding and since I have a couple of sdr receivers ( hack rf and sdr uno) I thought I would make a start one a couple of filters ... the 1st I've made is a 137 Mhz bandpass which doesn't look too pretty but she definitely has all the curves in all the right places ....
SMD's populated
Coils are a bit too long but have tweaked centre band nicely
So here is the curves ... judge for yourselves
Tried it on the new NanoVNA-f and I was quite impressed with the quallity and how close it was to my Rigol 815
Here's the Smith's chart showing what I expected.. capacitance and a little inductance ... ( well that what the filter is made of )
No comments:
Post a Comment