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art-e@o2.pl
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Call Sign : 161-CT-009
Posts : 4
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Join date : 2020-07-08
QTH or Location : JO90LH (Chorzów, Upper Silesia)
Equipment Used : TRX: President; ANTENNA: self made
Age : 37

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PostSubject: velocity factor table   velocity factor table Icon_minitimeSat Jul 11, 2020 11:27 am

Hello All
Could someone provide a link or paste an image of a table that shows velocity factor of different materials? I mean materials for rods or tubings that we can use for antena building. 
For example:

copper0.95
aluminiumxxx
stainless steelxxx
brassxxx

I guess I'm too impatient or I lack of skills for internet searching, cause I cannot find such info.
Regards
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BigTone
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Call Sign : G8YMW or 26CT4498
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Equipment Used : CRT 9900, Yaesu FT817, Kenwood TS570, Icom 910
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PostSubject: Re: velocity factor table   velocity factor table Icon_minitimeMon Jul 13, 2020 6:46 pm

Solid dielectric (coax)   = .66
Foam dielectric            = .85(?)
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The DB
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PostSubject: Re: velocity factor table   velocity factor table Icon_minitimeTue Jul 14, 2020 1:26 pm

Its not based on the metal, its based on the dielectric used.  Its not that metals don't have a velocity factor, but all of them including stainless steel (which is the worst metal for velocity factor used for antenna builds) has a velocity factor higher than .99.

Velocity factor is determined mostly by a feed line's dielectric, the most common ones for 50 ohm coax were listed by BigTone, although that isn't necessarily all of them.

Here are some examples...

95–99Open-wire "Ladder" Line
93HJ8-50B 3 inch Heliax coaxial cable (air dielectric)
86RG-8 Belden 7810A coaxial cable (gas-injected foam high-density polyethylene)
83RG-6 Belden 1189A coaxial cable, RG-11 Belden 1523A coaxial cable
82RG-8X Belden 9258 coaxial cable (foamed polyethylene dielectric)
80Belden 9085 twin-lead
77RG-8/U generic (foamed polyethylene)
66Belden 8723 twin shielded twisted pair stranded (polypropylene insulator)
66RG-213 CXP213 (solid polyethylene dielectric)

The DB
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