[time-nuts] RG 6 U couplings

Rob Sherwood. rob at nc0b.com
Sun Dec 6 10:07:53 EST 2015


I initially had 50 feet of RG-58/U going to my GPS antenna.  The loss was likely around 12 dB.  That cable eventually failed, and all I had was a 100 foot length of the same type of cable, and surprisingly the GPSDO still worked ok.  Recently I purchased a 35 foot length of 3/8th inch hardline with factory-installed N connectors on eBay for $40.  The loss should be less then 2 dB.  Obviously it works, but I cannot tell that the 10 dB reduced loss from the original cable made any difference.  Rob, NC0B

Sent from my iPad

> On Dec 6, 2015, at 7:00 AM, "David J Taylor" <david-taylor at blueyonder.co.uk> 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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> Email: david-taylor at blueyonder.co.uk
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