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141. Re: [TowerTalk] TowerTalk difference? (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Mon, 15 Apr 2024 12:07:05 -0700
Are you being facetious?  Towertalk@contesting .com is text only and always has been.  The only way around that is to post a link to some other site. Dave   AB7E 73, Pete N4ZR On 4/15/2024 1:29 PM, j
/archives//html/Towertalk/2024-04/msg00045.html (9,365 bytes)

142. Re: [TowerTalk] Fwd: MFJ QRT on May 17, 2024 (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Fri, 26 Apr 2024 11:35:54 -0700
LOL.  No way was any of MFJ's manufacturing J.I.T.   A few years back somebody did a video tour of MFJ's manufacturing line ... where they made actual MFJ gear ... and it was a horrible mess.  Almost
/archives//html/Towertalk/2024-04/msg00100.html (10,112 bytes)

143. Re: [TowerTalk] Drones (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Tue, 21 May 2024 12:26:41 -0700
I use a DJI Mavic Air 2 (the older version of the Air2S), which can be had for less than $450 used.  There are several on eBay right now that even include extra batteries.  It works great, is stable
/archives//html/Towertalk/2024-05/msg00077.html (10,452 bytes)

144. Re: [TowerTalk] Drones (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Tue, 21 May 2024 13:02:33 -0700
I use this for my Mavic Air 2: https://tinyurl.com/5cpsj4vv However, as best I can tell the Phantom 3 doesn't have the same LED landing light, and I can't find where Hanatora offers a similar payload
/archives//html/Towertalk/2024-05/msg00080.html (8,915 bytes)

145. Re: [TowerTalk] How lossy are PL-259s at HF? (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Mon, 17 Jun 2024 11:41:39 -0700
That's really interesting data.  I'm currently thinking about an array of helical antennas for weather satellite reception at 1700 MHz that would need a phasing harness.  Your results suggest that si
/archives//html/Towertalk/2024-06/msg00028.html (11,772 bytes)

146. Re: [TowerTalk] 80 Meter Delta Loop (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Wed, 24 Jul 2024 12:13:51 -0700
That statement isn't actually true.  The near field losses might be mitigated, but the far field pattern will still be just as bad. Dave   AB7E _______________________________________________ TowerTa
/archives//html/Towertalk/2024-07/msg00068.html (8,768 bytes)

147. Re: [TowerTalk] 80 Meter Delta Loop (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Wed, 24 Jul 2024 13:32:51 -0700
A vertical on a slope (or cliff) means that the dirt in the far field isn't actually all there.  Air is a lot less lossy than dirt. It's the takeoff angle that gets the benefit. Dave   AB7E But then
/archives//html/Towertalk/2024-07/msg00073.html (11,715 bytes)

148. Re: [TowerTalk] 80 Meter Delta Loop (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Wed, 24 Jul 2024 15:47:00 -0700
Sigh ... OK, OK, I'm sure you know that I meant field strength at low angles. Dave AB7E On 7/24/2024 3:19 PM, Jim Brown wrote: On 7/24/2024 1:32 PM, David Gilbert wrote: A vertical on a slope (or cli
/archives//html/Towertalk/2024-07/msg00078.html (10,224 bytes)

149. Re: [TowerTalk] Heliax question (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Sat, 5 Oct 2024 11:03:48 -0700
https://www.talleycom.com/product/ANDLDF4.5-50 _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://l
/archives//html/Towertalk/2024-10/msg00037.html (9,056 bytes)

150. Re: [TowerTalk] Different dipole design (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Mon, 23 Dec 2024 13:13:51 -0700
Stan already pointed out that he didn't want to hang drooped ends close to the towers that he is using to support the dipole.  He would get unwanted coupling with them. And his modeling (correctly in
/archives//html/Towertalk/2024-12/msg00082.html (8,025 bytes)

151. Re: [TowerTalk] Different dipole design (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Wed, 25 Dec 2024 21:41:51 -0700
Agree, Jim.  I found modeling antennas with EZNEC to be a great way to learn about antennas.  I've learned more about how they work from looking at the current distributions along the wires/elements
/archives//html/Towertalk/2024-12/msg00089.html (9,825 bytes)

152. Re: [TowerTalk] Low 160m Dipole - how bad? (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Mon, 13 Jan 2025 15:22:48 -0700
Agree that vertical propagation is usually the way to go for transmit on 160m, although I live on a steeply sloping hillside and have had decent luck with a low Inverted-Vee on 160m in the past. Seve
/archives//html/Towertalk/2025-01/msg00031.html (10,471 bytes)

153. Re: [TowerTalk] Verticals on sloping ground (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Tue, 14 Jan 2025 14:38:58 -0700
That's a very good point.  The soil even on my own four acre lot is HIGHLY variable, and I know that for a fact because there is a deep ravine running across a portion of it. The variation in the com
/archives//html/Towertalk/2025-01/msg00042.html (10,065 bytes)

154. Re: [TowerTalk] Verticals on sloping ground (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Wed, 15 Jan 2025 11:15:15 -0700
Yes, I'm aware that HFTA is usable for horizontal polarization only.  I was only trying to make two points ... that HFTA results are indeed affected by terrain features far in the distance, and that
/archives//html/Towertalk/2025-01/msg00051.html (13,154 bytes)

155. Re: [TowerTalk] Camera on Tower (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Thu, 16 Jan 2025 01:20:39 -0700
Exactly what are those "security features" that you don't want? I've had a couple of WiFi security cameras and they are about as basic as you can get. If you want an external weatherproof WiFi camera
/archives//html/Towertalk/2025-01/msg00060.html (8,542 bytes)

156. [TowerTalk] EZNEC Question (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Mon, 27 Jan 2025 20:33:55 -0700
I've been using EZNEC Pro/2 to try to model the effects of dielectric loading on a wire antenna ... specifically a full wave loop on 435 MHz.  I split the sides of the loop up into multiple wires (ea
/archives//html/Towertalk/2025-01/msg00075.html (7,015 bytes)

157. Re: [TowerTalk] EZNEC Question (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Tue, 28 Jan 2025 10:50:09 -0700
Hi, Jim. I've attached a copy of the EZNEC file to this reply.  It won't get through the reflector but will hopefully get to you directly. I'd love to hear your thoughts. The loop is intended to repr
/archives//html/Towertalk/2025-01/msg00079.html (10,830 bytes)

158. Re: [TowerTalk] EZNEC Question (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Tue, 28 Jan 2025 11:12:57 -0700
Ahh ... I just reread my post and realized I said relative permeability ... I meant relaitive permittivity. Dave   AB7E Hi, Jim. I've attached a copy of the EZNEC file to this reply.  It won't get th
/archives//html/Towertalk/2025-01/msg00080.html (11,459 bytes)

159. Re: [TowerTalk] EZNEC Question (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Tue, 28 Jan 2025 12:08:57 -0700
https://hamwaves.com/wire/doc/Insulated%20Wires:%20The%20NEC-2%20Way.html I also harkened back to the formula for velocity factor in a coaxial transmission line, which is V = 1/sqrt(er), where er = t
/archives//html/Towertalk/2025-01/msg00081.html (9,214 bytes)

160. Re: [TowerTalk] EZNEC Question (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Wed, 29 Jan 2025 12:49:46 -0700
Given that the field strength of that traveling wave follows current, would that mean that the loading effect tracks the current distribution of the wire simply because the field strength does? Dave 
/archives//html/Towertalk/2025-01/msg00082.html (10,527 bytes)

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