Author: david.b.curtis@intel.com (Curtis, David B)
Date: Tue, 21 Dec 1999 09:55:07 -0800
Both the Force 12 catalog and recent posts suggest that the multiple feedline multi-band antennas can be used simultaneously by different operating positions as long as appropriate filters are in pla
Author: david.b.curtis@intel.com (Curtis, David B)
Date: Mon, 1 Nov 1999 16:00:36 -0800
Thanks for the response. I learned a lot from it. The story about the local expert says a lot... I suspect that in most areas there are only a few soil types and a local soils engineer can probably g
Author: david.b.curtis@intel.com (Curtis, David B)
Date: Wed, 6 Oct 1999 09:58:20 -0700
Well, the big antenna farms are certainly highly visible, in part because the owners are quite justifiably proud of them so we hear about them, and also because a station like this does not sit idle
Author: david.b.curtis@intel.com (Curtis, David B)
Date: Wed, 6 Oct 1999 11:36:21 -0700
No... This is an oversimplification -- it may still have the same forward gain, but it could be losing a lot more often in pile-ups. This is why the Airforce buys jets today, and not prop-driven spr
Author: david.b.curtis@intel.com (Curtis, David B)
Date: Thu, 7 Oct 1999 14:43:14 -0700
Have anyone tried the methodology outlined in Leeson's _Physical Design of Yagi Antennas_ ? I have not. Let's see if I can recall it... this may be slightly mangled, as it's been a while since I read
Author: david.b.curtis@intel.com (Curtis, David B)
Date: Mon, 11 Oct 1999 12:02:51 -0700
Hello TowerTalk Gang, Do any of you have lease arrangements with commercial communications operators? I've been approached about having a commercial tower on my property, and am trying to peg a value
Author: david.b.curtis@intel.com (Curtis, David B)
Date: Tue, 12 Oct 1999 11:19:35 -0700
Works great. "J-pole" is a half-wave dipole, end fed (which is a voltage loop) through a quarter wave transmission line shorted at the bottom. To form this mental image: draw a horizontal dipole, and
Author: david.b.curtis@intel.com (Curtis, David B)
Date: Thu, 14 Oct 1999 09:08:14 -0700
Last Monday night N6RO brought a slick gizmo to our club meeting for "show and tell". I'll try to describe this thingy... 1. Start with a piece of angle stock about 18 to 24 inches long. 2. Put a muf
Author: david.b.curtis@intel.com (Curtis, David B)
Date: Wed, 20 Oct 1999 10:33:26 -0700
I think you should file a bug report with the software author :-) 73, Dave N6NZ How about some details? Specifically wire segment length, spacing, ect. And especially ground characteristics. And if i
Author: david.b.curtis@intel.com (Curtis, David B)
Date: Thu, 21 Oct 1999 13:56:52 -0700
Umm... 1. See the smiley. 2. 90 dB? Mathematically achievable. But... 2a. Does the design have margin? Can you move or change the wires more than a tiny amount without seeing this miraculous notch di
Author: david.b.curtis@intel.com (Curtis, David B)
Date: Wed, 27 Oct 1999 11:23:28 -0700
A generic hand riveter from the local hardware store will work fine. It's even reasonable to do a C3-size antenna for "expedition/FD" style operation, although for a weekend operation, I leave out so
Author: david.b.curtis@intel.com (Curtis, David B)
Date: Wed, 27 Oct 1999 13:36:00 -0700
The Rohn catalog talks about "normal" soil. What is "normal"? What is a simple, cheap test that I can do to see if I have "normal" soil? Is this something that can be done as a slump test? Then, of c
Author: david.b.curtis@intel.com (Curtis, David B)
Date: Wed, 27 Oct 1999 16:54:26 -0700
Hi Roy, Well, OK. That's the spec. Well and good. I read that, too, but it still leaves me with questions. So.... What counts for "rocks"? And how do I measure this 400 lbs per square foot of bearing
Author: david.b.curtis@intel.com (Curtis, David B)
Date: Sun, 12 Sep 1999 10:36:09 -0700
This does not sound like the TCI problem. TCI is usualy ~3525 KHz, drifty. Constant carrier, with FM voice modulation when phone is off-hook. Harmonics to daylight, if you are close enough to the sou
Author: david.b.curtis@intel.com (Curtis, David B)
Date: Tue, 14 Sep 1999 09:51:57 -0700
I've seen the result of just such an arrangement -- and it is not pretty. Mortar is extremely weak in shear. In other words, side loads of any kind on masonry are an extremely bad idea. Your chimney
Author: david.b.curtis@intel.com (Curtis, David B)
Date: Mon, 20 Sep 1999 10:25:18 -0700
N6TR once upon a time had some pictures of W5WMU up on the web somewhere. Unfortunately, I can't remember where. But W5WMU appears to be built on a salt marsh. I distinctly remember a photo of a towe
Author: david.b.curtis@intel.com (Curtis, David B)
Date: Wed, 11 Aug 1999 12:07:26 -0700
Hi Dave, OK, here is the "think-out-of-box" question of the day: As you point out, putting a 40M dipole parallel to and spaced very close to the boom of a tri-band yagi works pretty well. So... why c
Author: david.b.curtis@intel.com (Curtis, David B)
Date: Sun, 15 Aug 1999 10:39:42 -0700
Aha! I always wondered what the CivE's that took "Concrete II" studied! Now, what is the correct way to keep a something like, for instance, the base of a free-standing tower moist? Assume a 2 to 4 y
Author: david.b.curtis@intel.com (Curtis, David B)
Date: Thu, 29 Jul 1999 09:17:47 -0700
Leeson's book (Physical Design of Yagi Antennas) has a nice chapter comparing the popular taper compensation algorithms. 73, n6nz identical or Yes, you'd see a difference. You have to allow for taper
Author: david.b.curtis@intel.com (Curtis, David B)
Date: Fri, 16 Apr 1999 13:30:28 -0700
Literature exists. We cleaned Tom out last weekend at Fresno. 73, dave n6nz I just called Force 12 and requested literature. The cordial lady said she would send the new antenna brochure, and also th