[time-nuts] RG 6 U couplings

[Mark Spencer]

I've seen data re delay vs temperature for high end 50 ohm cables.  I've never seen it for 75 ohm CATV style cable.

Back when I was into time nuts pursuits this was one of the main reasons I was contemplating switching my GPS antenna feed line to hardline.   I never made the change but still have the hardline.   

To this day I still use Teflon RG58 style cable (purchased surplus from Boeing decades ago) for my GPS antenna fee line to the splitter.   I doubt I will ever change it out.

Sent from my iPhone

> On Dec 6, 2015, at 4:21 AM, Attila Kinali <attila at kinali.ch> wrote:
> 
> On Sat, 5 Dec 2015 17:06:03 -0800
> Mark Spencer <mark at alignedsolutions.com> wrote:
> 
>> Over the years I've used a number of CATV style 75 ohm patch cords
>> with F connectors, F female to female couplers and F to other connector
>> adaptors to distribute gps signals from my GPS splitter to various
>> receivers.   I've never been able to notice any difference in reported
>> signal strength vs using "brand name" 50 ohm coax with N connectors.
> 
> Well, putting the numbers into a calculator gives:
> VSWR: 1.5
> Load Return loss: -14dB
> Load Mismatch Attenuation: -0.2dB
> 
> I'd say that for a receiver, this is quite negligible. Heck, even 1dB
> loss wouldn't hurt too much. I would suggest, that for all practical
> purposes, the use of (good) satellite coax cable would be more than
> good enough for most of us. The only thing i'm not sure about is how
> the delay through the cable behaves over time (aging, temperature, humidity).
> If anyone has some data on that, for different types of cables, I
> would appreciate getting a copy :-)
> 
>            Attila Kinali
> 
> -- 
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> the prosperity and technological sophistication in the world is of no 
> use without that foundation.
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