Due to my small city lot and modest budget, and my need to have a tower I don't have to climb, I have been looking very hard at the short crank-up towers from US Tower. My thought is to install one n
I have recently replaced my 30 year old TH-7 on 50 feet of Rohn 45G with a new TH-7 on new Rohn 45G. The boom length and maximum element of the TH-11 and the TH-7 are the same; these are big antennas
As to gain figures for these antennas -- around 1999-2000, Ward, N0AX, and Steve, K7LXC, set up and measured a dozen or so tribanders on a tower under carefully controlled conditions. A few years lat
I'm extremely happy with my Force 12 6BA. If you drop off the 40 meter part of it, you still have a crackerjack antenna, I suppose. That would be the XR 5 (I have no experience on the XR 5 without th
I wouldn't attribute all of that to height -- what you can HEAR is primarily the result of antenna directivity and noise rejection. Windoms are notoriously bad for noise rejection, because they are b
I hear you. And contesters with stacked arrays agree with you. But, I remain suspicious that, on average, height wins out. This situation, after all, has one individual picking between one height or
Doesn't adding a long mast put the antenna out of reach from your roof? John KK9A Due to my small city lot and modest budget, and my need to have a tower I don't have to climb, I have been looking ve
Hi Jim - Would you like to add any comments regarding LP's. Granted, only as much "gain" as a good two or three element yagi and no killer as far as F/B is concerned, but no traps, no "critical" tuni
I don't know enough about them to comment. I've only heard that their gain is relatively low compared to a Yagi with the same boom length. It has long been well known that the gain of a Yagi is relat
The TH-11 appears to me to be a WARC enabled TH-7.... the log cell is just 20, 17, 15, 12, and 10 meter driven elements fed in log periodic fashion and with yagi type reflectors and directors on a 24
Only a small portion of the LP elements carry significant current on a given frequency - only a "few" elements are "active". This means that the gain of an LP is generally equivalent to a non-optimum
I did some EZnec model comparing an 18 ft. boom T8 to an 18 ft. boom C3. The gain is down about half to 3/4 dB on the T8, if I remember correctly. And it covers more bands and is $400 less. I haven't
I originally ran a T6 from Tennadyne. It was ok on 10/12/15 but I was never excited about the performance on 17 and 20. I am no EE but I figured the boom length was probably a little short. I run an
I did the same study almost 10 years ago using AO (the results should be in the archives) comparing the Cushcraft 20-10 meter LP, the Force 12 C3e and original three element SteppIR. The 18 foot Cush
I really don't find the below... In the real World .... My 12 element Log at 110" stays with my 4 element Quad at 80 feet ...but is behind a 4 element 44 foot W2PV mono at 140 feet at band opening an
You've got too may variables to compare them directly. What band, different heights, etc.? Put them on an antenna range under controlled conditions and see what happens. The additional height of your
I briefly looked at log periodics and one thing that hasn't been discussed here is the mediocre SWR of LPDA's. You're pretty much going to have to use a tuner, and you also have increased feedline lo
Rick I disagree with your statement. As a owner of a Tennadyne T-10 and currently a T-12 your statement is flat out wrong. I swept my T-12 with my rig expert AA-230 analyzer and it was below 2-1 acro
My Yaesu Mark 5 would begin to roll back its power output over about 1.8:1. What really bugs me about LPDA's is the terrible tradeoff between weight and size and gain/directivity at any given frequen
Author: "Roger (K8RI) on TT" <K8RI-on-TowerTalk@tm.net>
Date: Sat, 26 Oct 2013 14:46:01 -0400
On 10/26/2013 1:56 PM, steve jobes wrote: Rick I disagree with your statement. As a owner of a Tennadyne T-10 and currently a T-12 your statement is flat out wrong. I swept my T-12 with my rig expert