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
Filters for 13cms....
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Re: Filters for 13cms....
Hi Gareth
We recommended 2395 MHz for 13 cms ATV in the last CQ-TV. That's what Noel and I will be on during the contest.
Dave
We recommended 2395 MHz for 13 cms ATV in the last CQ-TV. That's what Noel and I will be on during the contest.
Dave
Re: Filters for 13cms....
Not wishing to be pedantic but 2395 MHz is only suitable for DATV as the band edge is 2390MHz.
Analogue video should be used in the segment 2322 to 2350MHz.
https://rsgb.services/public/bandplans/24/
Noel
Analogue video should be used in the segment 2322 to 2350MHz.
https://rsgb.services/public/bandplans/24/
Noel
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Re: Filters for 13cms....
Right, I'll tweak it up for DATV on 2395 then
Hope to 'see' you then....
Work still in progress, hoping to shift the IF on my old Drake downconverter as per my ramblings on Thursdays net.
Gareth
Hope to 'see' you then....
Work still in progress, hoping to shift the IF on my old Drake downconverter as per my ramblings on Thursdays net.
Gareth