[TowerTalk] Real "50 ohm" cable ?

[Phil]

Just checked a 1966 ARRL handbook and it lists both
RG8A/U and RG58A/U as 53 ohms.

If I remember correctly back when I was getting started
in ham radio in 1963 or so, it was generally referred to
as "52 ohm".

73, Phil  W5BVB



On 9/26/2020 8:53 AM, Artek Manuals wrote:
> I recently purchased a nice VNA ( Array Solutions AIM4300 ...good news 
> /bad news ..contact me off list) . Like a kid with a new chemistry set 
> at Xmas I set about measuring everything in site with my new "toy". Much 
> to my naive surprise I found that much of the "50 ohm" coax I had (DX 
> engineering RG213 and RG8X), actually measured 51.8 ohms . Although I 
> did have a 75 ft piece of brand-X Hamfest special that measured 49.7 ohms!
> 
> Now I know that in practice there is not enough difference between 50 
> ohms and 52 ohms in actual use especially at 50MHz and below. 
> Occasionally though it matters ! Besides the truth in advertising thing 
> ( 2x4 lumber has always galled me) Does anyone know who makes legal 
> limit 50 ohm coax  that is actually 50 ohms and not 52 ohms?
> 
> Dave
> NR1DX