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Re: standing wave -GOOD QUESTION

There's the difference. What I've seen is that the Velocity of Propagation (VOP) varies as much by size as by manufacturer. a quick browse through Commscopes web site shows VOP's from .86 to .89 for different size cables. Consult the manufacturers specs for accurate VOP, as well as loop resistance information.
On another note, beware working in areas with older coax. PI coax was only designed for 400 MHz bandwidth, and anyone who upgrades this junk to 740 or 860 is going to see reflection buildup on the sweep response. Good luck

> V.O.P. is determined by the Dialectric that seperates the center conductor from the sheath..... is it gell, is it air, polyethylene, polypropylene, teflon, pic, pulp......whatever.
> A QR .860 and a QR .715 cable have the same V.O.P.(.88) but are different size cables.
>
> > Well we know that. I didn't think it varies by 2 or so ohms, but yes we know that. Just like all of your actives/passives/ hell even splices, splitters, barrels, are rated with a return loss. (hopefully at least by 20 db) meaning that you'll have a signal 20db low of the injected signal reflecting back towards the source. The higher the return loss rating, the closer to a true 75 ohm device you have.
> >
> > This doesn't answer at all our question about velocity of propagation varying on coax sizes though.
> >
> > Kevin[frust
This is CABL.com posting #70129. Tiny Link: cabl.co/msph
Posted in reply to: Re: standing wave -GOOD QUESTION by switchman
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