> In a well-built system, disconnecting the coax from the matching transformer > ought to leave you with no pickup. "well built" means using coax that > totally shields the conductor, grounding the shield well, and keeping pickup > on the shield from getting to the radio by using "choke baluns". > > The easiest part to improve may be the coax: Radio Shack sells about the > poorest grade of coax made with respect to shield coverage, or used to. I > don't see that spec on their web site now.
That's exactly what I thought. When the dummy antenna was connected to the receiver, no signals at all. Put in the 150' of RS coax, and viola! Just like a BOG of 150'. However, when I swapped out the RS stuff for an equivalent length of brand new Belden RG-6 and new connectors - and got no change, then it became a head scratcher. As I said, I am puzzled as to how signals get in a shielded cable. The Belden has 100% foil shielding plus an aluminum braid drain. Maybe the quad foil shield would be better. At this point I'm not sure it's worth the cost to buy a box and find out. One of my clients had a 160' run of Andrew heliax at 75 ohm impedence, bought by mistake (by someone else). I should track it down and buy it from them. If signals got into that, then there is no hope.. Hey, I'm open to suggestions! The goal is to get a way to move a range of signals from Point A to Point B without tainting them. I'd even consider an RF to fiber optic conversion.. Craig Healy Providence, RI _______________________________________________ IRCA mailing list [email protected] http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: [email protected]
