Re: [digitalradio] A tad off-topic - Excess coax
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
Re: [digitalradio] A tad off-topic - Excess coax
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
Re: [digitalradio] A tad off-topic - Excess coax
--- Dave 'Doc' Corio [EMAIL PROTECTED] 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 It should not have any effect. Depending on the size of the coax (rg-8 or rg-58) I would coil it up in a 5 inch to a 1 foot in diameter coil outside the shack. If there is any RF on the outside of the coax, it will help keep it out of the shack. If there is not any rf on the outside of the coax , then it will not have any effect. __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
Re: [digitalradio] A tad off-topic - Excess coax
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
