Bill The fact that 10 is 'sort of' OK implies that the innermost trap is working properly, isolating each element from the end sections. 'sort of' is a bit worrisome, in that it probably only takes o
Don't have a Pro3, but... On the Pros, turning on some NR will help the popping. Unfortunately, the effect goes away within 15 seconds on the Pro and Pro2. I hear it will persist on the Pro3, so turn
I have tried modelling this beast, and can get reasonable numbers, but I don't really trust the connection between the model and the real world, due to the trap design. Most modelling programs cannot
I also measured resonances of the elements a long time ago. Here are my numbers, which are slightly different from KLM's. The results of such measurements are variable depending on your technique. -T
Any other antennas around? I have a KT-36XA 9 feet above my 40-2CD on a separate rotator. When the Boom of the XA is parallel to the elements of the 40-2CD ( 90 degree firning direction offset) I see
Well, I had really hoped to be able to share a success story about detuning booms, but unfortunately all I can report is a 'result'... Situation: KT-36XA at 80 feet, 8 feet above a 40-2CD on a swingi
The K7LXC Tribander Comparison study was excellent; however, the particular KT-34XA they used had some sort of flaw, as the SWR curves were out of line with the manufacturer's published curves. (This
The issue of lossy traps is only one of a number of factors that enter into antenna comparison and selection. The real question is which antenna is best for you? And of course, there is no simple or
I submitted this last night but it didn't post, so I have attempted to shorten it some more. My apologies if it is a double post. The issue of lossy traps is only one of a number of factors that ente
Let me respond to Julio and Mike's valid points by clarifying a few things: I've owned two KT-34XAs of the KLM design, and one KT-36XA of the M2 design. The KLM designs typically required rebuilds ev
...depends on where you are on the db/$ curve! If you have already made sure you have the full legal limit output power for your country, and you have the best receiver you can afford, then you have
I have a pair of vertically polarized delta loops on 80, fed as a parasitic array with one reflector. The impedance of each loop is around 100 ohms, so if the feedline length is not really long, I su
I have a question which needs to be answered to figure out some filtering/switching schemes. Would a low-band directional receive antenna, such as a Beverage or a Flag/Pennant, ever be better on rece
I bought 100' of the Jefa 400 cable through eBay. The polyethelyne jacket is a bit stiffer than 9913. The loss is as quoted, measured using my miniVNA. Preparing the ends for soldering is a bit diffi
The only real problem I see is if the upward angled elements could collect water inside, maybe freeze and split...? -Tony, K1KP _______________________________________________ _______________________
Use the shortest possible leads you can to make the connection. -Tony, K1KP _______________________________________________ _______________________________________________ TowerTalk mailing list Towe
As one of those things I was going to do when I got a 'Round Tuit', today I started inspecting my guy anchor rods. (Tower is 78' Rohn 45G, three guy levels; installation 16 years old). I excavated th
Paul Looks like a fairly spindly pole. I would be concerned that adding guys would increase the compressive load in the pole, which might cause it to bend out of column and fail. I would think that t
I just modeled nearly the same situation - a 40-2CD 10 feet under a KT34XA. I found that at this close spacing, forward gain on the XA on 20 was down ~1.5 dB. High angle rearward nulls get filled in.
Actually, this model has benn floating around for quite some time - I don't claim to have created it. Someone measured the loading coil inductance and posted it. I'm using NEC2. I don't claim it's a