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John Ferrell wrote: On Fri, 6 Apr 2007 08:21:15 -0600, "Ed Nielsen" wrote: Twist-in connectors do not provide the shielding that a CATV system needs. They are a HUGE source of ingress/egress, and the return loss is rather low (the higher the better. Hex-crimp fittings have ~18dB, and compression are 30dB). Plus, It actually takes more time to put on a twist-on connector that it does to put on a real connector. Compression fittings may cost a little more for the connector and the installation tools, but cost less in labor (time) to install. Not to mention the materials/time spent in replacing the twist-on connectors with real ones when they don't work properly. A couple of years ago the house took a lightning strike that I deduced damaged cabling provided by the cable system(Time-Warner). I removed my additions and placed a service call. When the truck arrived I showed them where I had dropped my stuff off the system and restored their original configuration. After they fixed the connector arc-overs they ran there signal leakage test. Then they requested I restore my alterations and one by one they chased down ALL of the twist-on and crimp connections that I had made and replaced them with their own compression fittings. The results were better picture quality, zero RF influence from the Ham Xmtr, and higher speed Internet. I think I better invest in the connectors and tool to keep things tidy. The 40-floor internal CATV system I was a customer of was very close to, and LOS with the Empire State Building antennas. The cabling engineers described the CATV system as one big antenna. Problems that poped up tended to be a bad connector or a grounding problem. It wasa data lan so if there was a problem we couldn't just tell theuser to watch the ghosts until we got around to fixing it. -- a d y k e s @ p a n i x . c o m Don't blame me. I voted for Gore. A Proud signature since 2001 |
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