Charlie Tango 11m DX Radio Group Forum
Would you like to react to this message? Create an account in a few clicks or log in to continue.


Welcome to the Charlie Tango DX Group. The home of ALL things Radio - CB, 11m DX, Amateur, PMR446, PLD, Network and Data. We welcome all radio enthusiasts of all knowledge levels. Join today and claim your own unique World Famous CT Call-sign
 
HomeEventsCalendarFAQSearchRegisterLog in
New eQSL Email Service: Exchange eQSL cards quickly and easily with your very own eQSL email address like this... 26CT000@eQSL.me or 26CT000@charlietango.co.uk - See Latest News forum for more details.
Latest Buxton 2020 News: Unfortunately, due to the Covid-19 pandemic we have had to cancel this year's Buxton date. Sorry for any inconvenience.
Navigation
Useful Radio Sites
Log in
Username:
Password:
Log in automatically: 
:: I forgot my password
CT Bill Board





Views This Year
All Time Views
Classified Adverts

Latest topics
» SS9900 and Power mic's
velocity factor table Icon_minitimeToday at 2:14 pm by Sgt Bilko

» Getting disillusioned
velocity factor table Icon_minitimeToday at 2:14 pm by Ethergoddle

» CRT 3900 - 27.305 on channel 16
velocity factor table Icon_minitimeToday at 12:48 pm by Alan - Mirror Man

» Call sign request
velocity factor table Icon_minitimeToday at 11:11 am by JB16170

» 2 ele quad /P
velocity factor table Icon_minitimeToday at 10:41 am by Victor

» New member introduction. (Issued)
velocity factor table Icon_minitimeYesterday at 8:35 pm by John123

» PMR446 NET
velocity factor table Icon_minitimeYesterday at 6:53 pm by Addaz93

» CTX CALL SIGN LIST
velocity factor table Icon_minitimeYesterday at 2:46 am by 108CT1642

» 26CT140 & 163CT232 pmr446
velocity factor table Icon_minitimeFri Sep 25, 2020 8:30 pm by ranger

Keywords
ALINCO antenna Mobile alan tango chart Calling Baofeng radio ss6900n list Sirio sign bazooka division call power yaesu frequency ss9900 midland callsign tickets lincoln president 9900
QRZ Database

 

 velocity factor table

Go down 
AuthorMessage
art-e@o2.pl
New Member
New Member


Call Sign : 161-CT-009
Posts : 4
Times Thanked : 0
Join date : 2020-07-08
QTH or Location : JO90LH (Chorzów, Upper Silesia)
Equipment Used : TRX: President; ANTENNA: self made
Age : 37

velocity factor table Empty
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
Back to top Go down
View user profile
BigTone
Contributor
Contributor


Call Sign : G8YMW or 26CT4498
Posts : 52
Times Thanked : 14
Join date : 2019-07-16
QTH or Location : Lincoln and Finningley
Equipment Used : CRT 9900, Yaesu FT817, Kenwood TS570, Icom 910
Age : 65

velocity factor table Empty
PostSubject: Re: velocity factor table   velocity factor table Icon_minitimeMon Jul 13, 2020 6:46 pm

Solid dielectric (coax)   = .66
Foam dielectric            = .85(?)
Back to top Go down
View user profile
The DB
10 + Year member
10 +  Year  member


Posts : 13
Times Thanked : 3
Join date : 2019-06-29

velocity factor table Empty
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
Back to top Go down
View user profile
Sponsored content




velocity factor table Empty
PostSubject: Re: velocity factor table   velocity factor table Icon_minitime

Back to top Go down
 
velocity factor table
Back to top 
Page 1 of 1

Permissions in this forum:You cannot reply to topics in this forum
Charlie Tango 11m DX Radio Group Forum :: Help and Discussion Forums :: Antenna Discussion-
Jump to: