2023-01-23, 21:21:29
(This post was last modified: 2023-01-24, 07:15:46 by Rob_Walker.
Edit Reason: Spelling
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I contacted Karl, the author of the article, and we got a bit of a dialog going on. If you go to the Groups IO forums where the repeater builders hang out, there are mixed opinions on the dielectric.
My inquiries said foam dielectric is 2 to 3 times better than air, but it didn't say say at what frequency. Karl uses air and has had no problems. I think the sure-fire test would be to connect a VNA and see if you get a bump down the line. My guess is you would get less of a performance or return loss issue with the copper tubing verses all the Andrews N connectors and couplers. Either way, the return loss would be so insignificant in my short run (<200') , it would not make a difference
I hope to keep you posted
By the way, 1/8" OD refrigerant copper tubing will take care or the centre conductor.
Cheers
73 Rob
My inquiries said foam dielectric is 2 to 3 times better than air, but it didn't say say at what frequency. Karl uses air and has had no problems. I think the sure-fire test would be to connect a VNA and see if you get a bump down the line. My guess is you would get less of a performance or return loss issue with the copper tubing verses all the Andrews N connectors and couplers. Either way, the return loss would be so insignificant in my short run (<200') , it would not make a difference
I hope to keep you posted
By the way, 1/8" OD refrigerant copper tubing will take care or the centre conductor.
Cheers
73 Rob