[TowerTalk] rg-59 manufacturer

[Steve Maki]

This sounds like video cable, not RF cable. Probably has copper braid 
shield and solid dielectric. For many baseband video applications 
(generally rated for 6 MHZ), the characteristic impedance would not be 
an overriding concern. But video cable made by Belden, Alpha, Commscope, 
or other well known manufacturers would be close to 75 ohms.

-Steve K8LX

On 2/15/2015 6:11 PM, charlie carroll wrote:

> I have some rg-59 that I want to use for phasing a couple antennas in a
> low-power environment.  The 2 cables are marked as:
>
> S.I.W TYPE RG-59/U-SP-95  MADE IN U.S.A
>
> and
>
> S.I.W TYPE RG-59/U-P-95  MADE IN U.S.A
>
> I am looking for the manufacturer's data sheet to understand the
> differences and characteristics of the cables.  The cable marked "SP"
> actually has a stranded center conductor while the other is a solid
> center conductor.
>
> The big difference, however, is the impedance of the cable.  The "SP"
> measures in the 63-65 ohm range with a VNWA, depending on which of
> several I measure.  The solid-center version measures about 71 ohms on a
> single sample.  The velocity factor is in the .64 to .66 range on all
> cables.
>
> Is there anyone that can point me to some data?
>
> 73 charlie, k1xx