[TowerTalk] Help identifying coax

[Bob Good]

I found a 52 ft roll of coax in my shop storage that I need help identifying.  I has a 12? gauge solid center conductor supported by a spiral support of plastic within a hollow plastic tube shielded by foil covered by tinned braid and a black jacket covering that.  No identifying marks on the jacket.  It is about the diameter of RG-8 type.  It is quite stiff and P 259 fits.  I am not familiar with the modern ‘low loss” types.  Thanks for any help.  Regards,  Bob K4BG