Very little. It is a fairly broadband 1:1 transformer at HF frequencies and it forces the currents in the center conductor and shield to be equal. The amount of power lost in such a choke balun is very small compared to the power delivered to the load. See The ARRL Antenna Book 21, 26-21
73, de AA5J At 06:02 PM 10/28/2007, Dave 'Doc' Corio wrote: > Hi, Chuck. Since that is just about the exact dimension for a > "choke balun" from the original Windom design, would it have any > effect on the impedance? I suppose I could just wrap it up and see > for myself, but thought I should at least be nice enoough to > respond, since you took the time to answer my post. > >Tnx! >Dave KB3MOW > > >Chuck Mayfield wrote: >> >>If it were my station, I would wrap it around a 3 to 4 inch form and >>lay it behind the operating table. That would further limit RF noise >>and would do no harm to SWR. >> >>Best regards, >>Chuck Mayfield >> >>Neither a lofty degree of intelligence nor imagination nor both >>together go to the making of genius. Love, love, love, that is the >>soul of genius. >>~ Wolfgang Amadeus Mozart >> >>At 11:45 AM 10/28/2007, Dave wrote: >> >> >Just put up a coax-fed Windom antenna and have about 15-20 feet of >> >excess coax. I'd prefer to keep the overall length of the coax, just >> >not sure if coiling it or laying it out flat would be better. I know >> >the older Windoms needed a tight coil of coax near the antenna, but the >> >1:1 balun in this one should negate that. >> > >> >Any ideas on which might be better? >> > >> >Tnx es 73 >> >Dave >> >KB3MOW >> > >> > >> >No virus found in this incoming message. >> >Checked by AVG Free Edition. >> >Version: 7.5.503 / Virus Database: 269.15.12/1096 - Release Date: >> >10/27/2007 11:02 AM >> >> >> >> >> >>No virus found in this incoming message. >>Checked by AVG Free Edition. >>Version: 7.5.503 / Virus Database: 269.15.12/1097 - Release Date: >>10/28/2007 1:58 PM >> > >No virus found in this incoming message. >Checked by AVG Free Edition. >Version: 7.5.503 / Virus Database: 269.15.12/1096 - Release Date: >10/27/2007 11:02 AM
