drpro Posted October 12, 2019 Report Share Posted October 12, 2019 Want to share observations on an inexpensive passband filter. Working on another version of my Cantar Mini bag and want to integrate all of the wireless to just two antennas. I would also like to have passband filtering which most of the commercial offering lack. So bought one of the Chinese passband filters to see how it looked. On the spectrum analyzer, it is wider than the printed label. At 8db down as shown on the analyzer the upper end is around 658mHz and the lower end is around 505mhz. The measured insertion loss is about 2.5db. Not as narrow as I had hoped. Still a lot of the T mobile spectrum could slip by. Probably would help with on set walkie-talkies in the 450-490mHz range. So for about 40usd not bad. Quote Link to comment Share on other sites More sharing options...
soundtrane Posted October 13, 2019 Report Share Posted October 13, 2019 maybe you can find something appropriate at minicircuits... Quote Link to comment Share on other sites More sharing options...
drpro Posted October 15, 2019 Author Report Share Posted October 15, 2019 Definitely Minicircuits would be my go to. Just wanted to pass along the results of testing an inexpensive passband filter from China. Quote Link to comment Share on other sites More sharing options...
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