Have not followed the Bazooka discussion in its entirety since I feel it goes a bit far OT. However one of the last postings raised a question in my mind due to the reference to the Late Cbik with wh
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 06 Jun 2008 23:03:34 -0600
That's true when the static is precipitation static, e.g. charged snow or rain collecting on the bare wire. Or not contacting the wire because of the insulation. There won't be any effect on static f
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Fri, 06 Jun 2008 23:29:28 -0700
A clarification. Noise is picked up on ANY transmission line as a common mode current, and is coupled to the antenna if the antenna itself is unbalanced. The vast majority of REAL ham antennas have s
<<<THIS is why antennas fed by open wire line tend to be noisier than those fed with coax. It isn't the line, it's the fact that you can't effectively choke it. >>> Hmmm, when I switch between my coa
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sat, 07 Jun 2008 16:03:57 -0600
Many have alleged the vertical matches the polarization of noise. Part of that may be true, also the quarter wave vertical usually has a low radiation angle and equal sensitive in all directions. The
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Sat, 07 Jun 2008 15:15:34 -0700
So? They're VERY different antennas, and verticals ARE noisier. I'm talking the same antenna, not a different one. 73, Jim K9YC _______________________________________________ TenTec mailing list Ten
Yes, this is what others have mentioned using balanced wires. Rather than addressing the symptoms it's better to address the cause. If the antenna is not balanced then we better try to balance the an
My question goes to the practical. Say we are using some version of RG8U; isn't it better to choke the feedline at both ends? And what are the cheapest but best toroids or beads to use? Where do you
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 09 Jun 2008 10:39:31 -0600
I don't see the benefit of choking the outside of the coax AT the radio. Unless the coax connector is loose at the radio, there's no way for any RF on the outside of the coax getting into the inside
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Mon, 09 Jun 2008 15:41:22 -0700
See my tutorial for the discussion of chokes as "egg insulators" in feedlines to minimize their interaction with nearby antennas (especially verticals). That's a TERRIBLE place to get specs or to buy
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 09 Jun 2008 17:18:42 -0600
At least the dimensions and permeability are listed at Amidon. The material numbers may not match from Amidon as commonly used by hams to Fair Rite parts and materials. Typical materials good up to 3
A link coupled tuner provides isolation. -- Darrell Bellerive Amateur Radio Stations VA7TO and VE7CLA Grand Forks, British Columbia, Canada _______________________________________________ TenTec mail