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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