Filters for 13cms....
Posted: Sat May 08, 2021 3:17 pm
I'm building up bits of kit for 13cms for 'out and about' and to help my front end escape Wi-Fi, sundry other stuff thats around on 2.4GHz etc I'm experimenting with pipe-cap filters. This article does a great job of explaining and developing one. http://www.w1ghz.org/filter/Pipe-cap_Fi ... isited.pdf
With short probes, I can have a 4MHz BW, by adding probe extensions the bandwidth increases to 60MHz but the slope of the filter isn't as good.
So some sort of compromise is needed.
If I am out /P on 13cms, is there a good SPOT frequency to use?
What is the power limit throughput for a filter like this? I imagine that some very high voltages will quickly arise with increased RF power, so maybe RX only.
SATSAGEN pictures help illustrate.....worth adding that insertion loss seems to be under 1dB....
Thanks
Gareth
With short probes, I can have a 4MHz BW, by adding probe extensions the bandwidth increases to 60MHz but the slope of the filter isn't as good.
So some sort of compromise is needed.
If I am out /P on 13cms, is there a good SPOT frequency to use?
What is the power limit throughput for a filter like this? I imagine that some very high voltages will quickly arise with increased RF power, so maybe RX only.
SATSAGEN pictures help illustrate.....worth adding that insertion loss seems to be under 1dB....
Thanks
Gareth
- 13cm_Pipecap_12mm probe.jpg (137.94 KiB) Viewed 2268 times
- 13cm_Pipecap.jpg (138.98 KiB) Viewed 2268 times
