[time-nuts] RG 6 U couplings

Magnus Danielson magnus at rubidium.dyndns.org
Sun Dec 6 09:27:31 EST 2015


David,

You obviously is not working with 75 Ohm N-connectors on a regular basis.

Also, the point was to show that using proper connectors isn't going to 
be a major issue in the loss process.

Cheers,
Magnus

On 12/06/2015 07:58 AM, David J Taylor wrote:
> Bert,
>
> Extending the RG-6U using N-connectors should not be giving you more
> than 0.20 dB, probably less. Considering that you have have 6.12 dB per
> 100 feet in RG-6U at 1 GHz (should be about 8 dB @ 1.575 GHz), so it
> will be more. Using N-connectors to extend the cable-stretch isn't going
> to be a major issue, it may be the cable length that could present an
> issue.
> []
> Cheers,
> Magnus
> =============================
>
> From: Bert Kehren via time-nuts
>
> Thank you all for the information, worse case I look at 70 feet with two
> couplings all in an inaccessible attic. The cable is quality but vintage
> 1989.  Part of an extensive cable TV wiring. So far nine with two I am
> not able
> to  locate the other end.The way they are installed I am not able yet to
> use
> one of  them to pull a new one in.
> Twenty years ago I probably would have risked crawling in there. Don't want
> to fall 16 feet at age 73.
> Bert Kehren Palm City .
> ============================
>
> Magnus,
>
> RG-6U is 75-ohm cable and uses type F connectors (horrible!).  Any F-N
> adapters and the impedance mismatch would surely introduce more loss
> than a simple Female-Female F connector.
>
> Bert,
>
> If the cable is that old, 1989, I would consider replacing it with a
> more recently purchased cable, which will not have deteriorated, and may
> have lower loss.  I appreciate that may not be possible in your case.
>
> Cheers,
> David



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