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Total 896 documents matching your query.

141. RE: [TowerTalk] tic ring in tandem (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Tue, 7 Sep 2004 15:25:33 -0000
The boxes I have for my 1022 rings could probably be synced pretty easily since they follow the setting of the front panel pot. Just have to do something like wire the two boxes to both follow one bo
/archives//html/Towertalk/2004-09/msg00109.html (9,954 bytes)

142. [TowerTalk] RE: [Antennas] coax 'sweet lenght' (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Sun, 10 Oct 2004 13:59:44 -0000
coax Its an urban legend. The best length to use is one that reaches from the radio to the antenna. There are some exceptions if you are counting on the feedline to act as an impedance transformer..
/archives//html/Towertalk/2004-10/msg00178.html (8,369 bytes)

143. RE: [TowerTalk] RE: [Antennas] coax 'sweet lenght' (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Mon, 11 Oct 2004 13:58:13 -0000
factor is wl NOT wrong. The swr in the coax doesn't change with length, except for small losses that always reduce it. The problem is cheap meters or installations that have rf on the outside of the
/archives//html/Towertalk/2004-10/msg00208.html (10,097 bytes)

144. RE: [TowerTalk] RE: [Antennas] loax 'sweet lenght' (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Mon, 11 Oct 2004 16:13:25 -0000
a Wrong, if there is a mismatch at the antenna you can get reactance along the line that varies in sign and magnitude. of Possibly, but of course as I said above you also have the reactance there al
/archives//html/Towertalk/2004-10/msg00219.html (10,134 bytes)

145. RE: [TowerTalk] Night climb (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Fri, 15 Oct 2004 11:50:57 -0000
if one is touching the frayed cord or a tool with an internal short and the tower you are directly in the path. And since it is rather hard to be up the tower without touching it you must be very sur
/archives//html/Towertalk/2004-10/msg00385.html (9,319 bytes)

146. RE: [TowerTalk] How to best determine the need for a balun (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Sat, 16 Oct 2004 11:38:30 -0000
A 'balun' is used to go from 'BALanced' to 'UN-balanced' feed types. A 1/4 wave vertical over a ground plane is already un-balanced and so it coax so no, a balun is not what you need. An rf choke on
/archives//html/Towertalk/2004-10/msg00422.html (10,421 bytes)

147. RE: [TowerTalk] How to best determine the need for a balun (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Sat, 16 Oct 2004 15:57:56 -0000
What kind of geometry was this with?? What about a case where the feedlines of a 4-square with elevated feed points is in the same plane as the radials?? Would the outside of the shield be any diffe
/archives//html/Towertalk/2004-10/msg00426.html (8,646 bytes)

148. RE: [TowerTalk] elevated anchor guy points (score: 1)
Author: k1ttt@arrl.net
Date: Thu, 21 Oct 2004 11:24:49 -0400 (EDT)
"maybe" it has enough dead weight that if on top of the ground it would resist being pulled sideways. but would it have enough overturning force for a lever arm of however many feet stick up from the
/archives//html/Towertalk/2004-10/msg00547.html (12,797 bytes)

149. RE: [TowerTalk] elevated anchor guy points (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Thu, 21 Oct 2004 19:44:49 -0000
Underground it is a much harder problem for all those reasons. My comments were in response to the off hand comment about it being enough even if it was on top of the ground. Try the calculation with
/archives//html/Towertalk/2004-10/msg00563.html (11,843 bytes)

150. RE: [TowerTalk] Ground radials- the long and short of it (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Fri, 22 Oct 2004 12:11:01 -0000
Yes, and even more when buried. The velocity of propagation is proportional to the square root of the dielectric constant if I remember correctly, and soil is a good dielectric. Think about it this w
/archives//html/Towertalk/2004-10/msg00589.html (12,225 bytes)

151. RE: [TowerTalk] Re: Thrust Bearing Usage (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Tue, 26 Oct 2004 20:58:53 -0000
to (flat) C-M of sway or Your physics is fine, 16' above the bearing and 4' below with all the weight above will definitely want to tip over. To keep it from tipping a real bearing does the job also
/archives//html/Towertalk/2004-10/msg00710.html (10,961 bytes)

152. RE: [TowerTalk] Cable TV hardline question (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Fri, 29 Oct 2004 10:52:10 -0000
If it has been handled carefully it should still be ok. Looks for cracks in the jacket where it was attached to the poles, any cracks may have let water in which would cause problems. I use catv hard
/archives//html/Towertalk/2004-10/msg00771.html (10,045 bytes)

153. RE: [TowerTalk] Cable TV hardline question (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Fri, 29 Oct 2004 11:54:21 -0000
No you don't. I use 75 ohm here for 160m through 70cm with runs up to 350' with no transformers and no problems on any band. David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://www.k1ttt.n
/archives//html/Towertalk/2004-10/msg00774.html (8,239 bytes)

154. RE: [TowerTalk] Cable TV hardline question (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Fri, 29 Oct 2004 12:51:06 -0000
hard 50 of price is Those matchers must not be real good. 3 of my runs feed stacks on 10/15/20, each is 4/4/4/4+4south. All combinations come out with reasonable results and no amp retuning needed o
/archives//html/Towertalk/2004-10/msg00778.html (8,877 bytes)

155. RE: [TowerTalk] Cable TV hardline question (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Fri, 29 Oct 2004 15:43:03 -0000
I use it on 6m,2m and 70cm with a ts-2000 and a couple tm-261's for 2m packet and none of them complain. Plug it in and try it, if it isn't good enough match for your radio add a short length of 75 o
/archives//html/Towertalk/2004-10/msg00782.html (11,644 bytes)

156. RE: [TowerTalk] Yaesu Rotator connector replacement (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Fri, 5 Nov 2004 11:33:54 -0000
simply That works for me, especially if working up a tower! David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://www.k1ttt.net AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net _________
/archives//html/Towertalk/2004-11/msg00096.html (9,259 bytes)

157. Re: [TowerTalk] New antenna system (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Mon, 8 Nov 2004 20:26:44 -0000
had SteppIR's require A sample of 2 does not a valid set of statistics make, unless that is the whole universe. How many others do you know who did not have them fail? As for the early failures... T
/archives//html/Towertalk/2004-11/msg00198.html (8,958 bytes)

158. Re: [TowerTalk] dump power? (score: 1)
Author: k1ttt@arrl.net
Date: Wed, 17 Nov 2004 11:38:38 -0500 (EST)
in a typical hybrid network used for dividing power and creating phase shifts in a 4-square vertical array or many other types of arrays there is a point in the circuit where any imbalance between th
/archives//html/Towertalk/2004-11/msg00462.html (9,126 bytes)

159. RE: [TowerTalk] elevated short vertical dipole or quarterwavemonopole? (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Sat, 4 Dec 2004 18:42:47 -0000
The reason for ground losses is because the ground is not a perfect conductor. Just like any metal it has some resistance (lots more than any metal), and anytime an electric field interacts with it t
/archives//html/Towertalk/2004-12/msg00070.html (13,110 bytes)

160. RE: [TowerTalk] taping coax to tower parts (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Wed, 8 Dec 2004 22:15:41 -0000
that must not have been very good galvanizing. I have used electrical tape for 20 years on rohn towers and the only difference when I remove it is that the galvanizing is shinier under the tape. Dav
/archives//html/Towertalk/2004-12/msg00196.html (8,087 bytes)


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