Jim: This is an easy one and I am sure there will be a flood of answers from other DXers. Many DXers use impedence transformers to connect their antennas to coax. You can see them sometimes marketed as a "balun". I have wound so many coils I can almost do it in my sleep. Not only does this help to electronically match your antenna to the coax, but it also electricallly isolates the antenna from the coax and at the same time prevents common-mode noise from going back to the radio through the coax.
Rather than re-write here what others have written about the subject elsewhere, I offer this URL a place to start. We can also talk about it on #mwdx. http://www.dxing.info/equipment/impedance_transformer_bryant.doc Bill Harms On 14 Jan 2007 at 14:20, Jim Pogue wrote: > OK, this is probably going to sound like a dumb question to a lot of you, > but I've never been one to shy away from asking dumb questions when I don't > know the answer. > > > > Background: I am planning to put up a new external long wire about 50 feet > in length. In the past I have always fed long wires with just another length > of insulated wire, but this time I plan to feed the signal to my Quantum > Phaser with RG-58 or similar coax. > > > > The question: When I attach the feedline at the end of the long wire, I will > solder the coax center wire to the antenna wire. But what does one do with > the braid or shield at the same location adjacent to the antenna wire? > Should it be attached to anything, sealed over with black electrician's > tape, or what? If I was putting up a dipole the answer would be easy, but > I've never fed a long wire with coax before. > > > > Thanks for your help folks - hopefully I'm never too old to learn. > > > > Jim Pogue KH2AR/WPE9HLJ/KG6DX1A > > Memphis, Tennessee USA > > > > NRD-535, ICF-2010 > > Wellbrook LA5030 loop, attic longwire > > Quantum phaser > > > > _______________________________________________ > 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] > > _______________________________________________ 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]
