I'm in a limited space location, I'm looking for a wire antenna to use on 40-10 meters. The handbook says a 40m dipole fed with ladder line will be 2 half waves in phase on 20, and have 1.8 db gain.
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Tue, 31 Jan 2017 20:50:48 -0400
Fed with open wire or ladder-line your 20 meter performance will be 2 half waves in phase and when properly matched is supposed to give you 3 db improvement broadside to the wire. Herb, KV4FZ On 1/31
I would either build a fan dipole or buy a trapped dipole. The Diamond W8010 dipole also works on 80m. John KK9A I'm in a limited space location, I'm looking for a wire antenna to use on 40-10 meters
nope! I'm in a limited space location, I'm looking for a wire antenna to use on 40-10 meters. The handbook says a 40m dipole fed with ladder line will be 2 half waves in phase on 20, and have 1.8 db
Since you didn't mention a balun, and I assume you are using one, the open wire line will exhibit less loss. That helps. 1.8 dB(what)? Chuck, W6AJW I'm in a limited space location, I'm looking for a
I hope he is not going to use a balun with the open wire line. 73 Tom W7WHY _______________________________________________ _______________________________________________ TowerTalk mailing list Towe
Dick Sure, because the open wire has very low loss. The 10dB you lose operating the 40M dipole on 20M is mostly heat warming up the dielectric of the coax as the signal reflects back and forth on the
Anybody that actually believes they're going to pick up 10db from using ladder line vs coax has lost the plot, I'm afraid. That'd effectively (simplistic approach here, but it gives the rough idea) t
Please consider an off center fed dipole. 15 meters won't be as good as the other bands. There are several that work with coax and a balun. Think also about a second balun for common mode current. 73
Author: Edward Mccann via TowerTalk <towertalk@contesting.com>
Date: Wed, 1 Feb 2017 13:20:14 -0800
No, don't think of a second balun. Think of a Common Mode Choke. In fact think of two of them; one after the 4:1 Balun at Feed Point ( 50 Ohm coax to approx 200 Ohm Impedance at feedpoint; and a seco
The extra 20:1 SWR loss in 100' of low loss RG8 (Buryflex, 9913, LMR400) at 14MHz is ~2.7 db per the online calculator http://www.arrg.us/pages/loss-calc.htm Use 100' of LDF5 and the 20:1 SWR loss is
Also a fan dipole will not have deep nulls that you will get on some bands when using the single ~130' dipole. John KK9A And for me my coax fed 80/40/20 fan dipoles (2 orthogonal @ 65') substantially
Yep, patterns that were predictable and useful with the fans at right angles to each other. Grant KZ1W John KK9A And for me my coax fed 80/40/20 fan dipoles (2 orthogonal @ 65') substantially outperf
The problem with this "logic" is that the gain increase in favored directions comes at the expense of gain in non-favored directions. With a stationary antenna, "gain" might not be a blessing. Person
If the gain is at the expense of the UP or DOWN direction, it is generally a benefit. --Mike, WV2ZOW _______________________________________________ _______________________________________________ To
Well, I converted to ladder line, I'm running 10 ft of RG8 Buryflex to a DX Engineering Balun feeding 43 ft of 450 ohm ladder line to my 40M dipole. 20 meters is about the same on either this or the
http://lists.contesting.com/archives//html/Towertalk/2017-01/msg00518.html Well, I converted to ladder line, I'm running 10 ft of RG8 Buryflex to a DX Engineering Balun feeding 43 ft of 450 ohm ladde