[Premium-Rx] RG58

[Edward Knobloch]

Hello, Richard

The double braided mil spec 50 Ohm coax  of RG-58 size is RG-55B/U.
If it has teflon dielectric, it is RG-142B/U.

The only currently mil-spec RG-58 (single braided) coax is RG-58C/U
Versions earlier than RG-58C/U used  a polyvinyl chloride (PVC) covering ,
which would leach plasticizing  agent over time to the inner dielectric 
material,
increasing the loss of the coax.  RG-58C/U uses a type IIa protective
covering (non-contaminating PVC or PVC-acetate).

Likewise, RG-8/U (single braided) was replaced by the non-contaminating 
RG-213/U
The double-braided RG-9/U (same size and loss as RG-8  coax)
was replaced by the non-contaminating RG-214/U.

Beware of coax that says something like "RG-58 type"
or "RG-8 type".  The actual material is not necessarily mil spec,
and if the manufacturer is cutting corners, you won't get a good product.
The real McCoy coax will say Mil-C-17 on it.
Recent military labeling of RG-58C/U is M17/197-00001.

73,
Ed Knobloch




RichardReich at aol.com wrote:

>
> Surely RG58-A-U is OK.
>
> Its a double shielded military spec cable. I've never had probelms 
> with it for LF work, but would like to hear what others use.
>
> Richard