What would be the bestest design for choke or balun to be used with dipole or OCF dipole? Like what type of core, number of turns or number of beads? I need an antenna for 30m band, and my very first
k9yc.com/RFI-Ham.pdf See the Choke Cookbook and text that precedes it. An off-center fed antenna is inherently poorly balanced, so it puts a high common mode current on the feedline, which in turn pl
Thanks Jim, I will read that :) Most likely, facing the frying problem, I will go with simple dipole or vertical delta. _______________________________________________ _______________________________
Author: TexasRF--- via TowerTalk <towertalk@contesting.com>
Date: Mon, 27 Apr 2015 13:02:40 -0400
dipole k9yc.com/RFI-Ham.pdf See the Choke Cookbook and text that precedes it. An off-center fed antenna is inherently poorly balanced, so it puts a high common mode current on the feedline, which in
Good choice abandoning the off center fed antenna plan. A dipole is a really simple and effective antenna. John KK9A Thanks Jim, I will read that :) Most likely, facing the frying problem, I will go
Assuming coax and reasonably low SWR, it might be possible to "brute force" it by using multiple 5K Ohm chokes in series on the line. In the early stages of my work on coax chokes, I rigged a special
Author: TexasRF--- via TowerTalk <towertalk@contesting.com>
Date: Mon, 27 Apr 2015 14:33:17 -0400
Assuming coax and reasonably low SWR, it might be possible to "brute force" it by using multiple 5K Ohm chokes in series on the line. In the early stages of my work on coax chokes, I rigged a special
Gerald, they typical solution is to cascade a 4:1 current balun *and* a high choking impedance common mode choke. The problem is maintaining the high impedance across the entire operating range of th
On Mon,4/27/2015 11:33 AM, TexasRF-- via TowerTalk wrote: Thanks for the information Jim. It all makes good sense down to the part about differential loss. That is a new term for me so I did a Google
Author: "Roger (K8RI) on TT" <K8RI-on-TowerTalk@tm.net>
Date: Mon, 27 Apr 2015 16:33:53 -0400
You will find that center fed dipoles are rarely balanced and even if they were, coax is unbalance, So the good old choke in Jim's tutorial should be a good idea. The RFI tutorial shows how many core
so, what do I do for simple inverted vee or sloped dipole? 1:1 voltage balun or coax choke? _______________________________________________ _______________________________________________ TowerTalk m
As far as I know, Fair-Rite is the only manufacturer of this material, which they developed around 2001. They sell through at least a half dozen distributors. Ham distributors, like kitsandparts are
For small quantity purchases, Arrow Electronics has reasonable prices. For example: 2631803802 2.4" cores $4.83 (backordered to May 4). 0431177081 big clamp-ons $11.03, in stock. Those prices are plu
so, what do I do for simple inverted vee or sloped dipole? 1:1 voltage balun or coax choke? like the 2.4 inch OD variety....then optimize the choke design for the 30m band.... 10.1 to 10.15 mhz. Sinc
Author: "Roger (K8RI) on TT" <K8RI-on-TowerTalk@tm.net>
Date: Wed, 29 Apr 2015 14:10:24 -0400
A Sloping dipole is certainly unbalanced, but it shouldn't present the unbalance on 30 that I get on the 75-80 meter band. Much does depend on the height above ground It took two hefty chokes to keep