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Total 104 documents matching your query.

81. [TowerTalk] Breaking boom resonance (score: 1)
Author: Steve London <n2icarrl@gmail.com>
Date: Tue, 28 Mar 2017 09:57:35 -0600
I have a 34 foot boom supporting an 80 meter wire beam. The elements of the wire beam are completely insulated from the boom. 30 feet below that boom is a 20 meter beam. Yes, there is definitely inte
/archives//html/Towertalk/2017-03/msg00406.html (7,215 bytes)

82. Re: [TowerTalk] 80 Meter beam (score: 1)
Author: Steve London <n2icarrl@gmail.com>
Date: Fri, 31 Mar 2017 09:43:59 -0600
I have a 2-element 80 meter wire beam, with inverted-vee elements. The boom length is 34 feet. The first thing to be aware of is the very narrow bandwidth. About 60 kHz between 2:1 SWR points, and th
/archives//html/Towertalk/2017-03/msg00465.html (8,671 bytes)

83. Re: [TowerTalk] 4 square advice (score: 1)
Author: Steve London <n2icarrl@gmail.com>
Date: Mon, 13 Nov 2017 09:11:03 -0700
You also need EZNEC if you don't already have it. Minimum of another $99. 73, Steve, N2IC _______________________________________________ _______________________________________________ TowerTalk mai
/archives//html/Towertalk/2017-11/msg00166.html (7,942 bytes)

84. Re: [TowerTalk] More on Half Wave (and HFTA) (score: 1)
Author: Steve London <n2icarrl@gmail.com>
Date: Sun, 20 Jan 2019 07:21:13 -0700
Thank you, Shawn, for this excellent posting. 15 years ago, while my house was being constructed here in New Mexico, I observed the same effects while trying to determine optimal heights and locatio
/archives//html/Towertalk/2019-01/msg00145.html (9,346 bytes)

85. Re: [TowerTalk] 40m Beam: Problem - Attenuation and Static (score: 1)
Author: Steve London <n2icarrl@gmail.com>
Date: Mon, 18 Mar 2019 11:08:30 -0600
Other related things to check: - A female UHF connector, barrel, etc. where the center conductor has expanded through use. - Are you powering a remote antenna switch through the same coax ? A loose c
/archives//html/Towertalk/2019-03/msg00243.html (8,549 bytes)

86. Re: [TowerTalk] EHS leads for Phillystran (score: 1)
Author: Steve London <n2icarrl@gmail.com>
Date: Thu, 3 Oct 2019 08:48:23 -0600
For those who live in an area with wildfire danger, consider that the flame lengths from tall grass and shrubs can be more than 15 feet, and phillystran-melting temperatures above that. You will need
/archives//html/Towertalk/2019-10/msg00028.html (8,664 bytes)

87. Re: [TowerTalk] EHS leads for Phillystran (score: 1)
Author: Steve London <n2icarrl@gmail.com>
Date: Thu, 3 Oct 2019 09:36:09 -0600
Yes, when you have tall trees and high fuel loading, there are bigger wildfire concerns than melted phillystran. 73, Steve, N2IC Ken K6MR -- *From:* TowerTalk <towertalk-bounces@contesting.com> on be
/archives//html/Towertalk/2019-10/msg00030.html (10,231 bytes)

88. Re: [TowerTalk] Remote switch (score: 1)
Author: Steve London <n2icarrl@gmail.com>
Date: Thu, 24 Oct 2019 09:15:40 -0600
Okay...my dumb questions of the week. Can I use my 2-port nanaVNA (which measures S11 and S21) to measure switch port isolation of a 1:N switch ? If my switch left unused ports open, would I simply m
/archives//html/Towertalk/2019-10/msg00195.html (7,773 bytes)

89. Re: [TowerTalk] Remote switch (score: 1)
Author: Steve London <n2icarrl@gmail.com>
Date: Fri, 25 Oct 2019 10:26:35 -0600
Thanks for the tips on measuring isolation, Wes. Measured a few switches I had laying around. Old B&W round switch. 70 dB @ 3.5 MHz, 60 db at 28 MHz. Not bad, considering. Array Solutions 2 antenna S
/archives//html/Towertalk/2019-10/msg00198.html (8,508 bytes)

90. Re: [TowerTalk] Remote switch (score: 1)
Author: Steve London <n2icarrl@gmail.com>
Date: Sat, 26 Oct 2019 12:32:48 -0600
This is a B&W 550A. Unused ports are not grounded. Yes, this is what it means. If your European antenna has more than ~45dB of directivity, then it could be an issue. For more fun and debate, I made
/archives//html/Towertalk/2019-10/msg00214.html (9,355 bytes)

91. Re: [TowerTalk] NEW NanoVNA Vector Network Analyzer 50KHz-900MHz (score: 1)
Author: Steve London <n2icarrl@gmail.com>
Date: Sat, 16 Nov 2019 08:18:25 -0700
I have had one for about 2 months. With its small size and low cost, it is an excellent tool when you need to check things out at the top of a tower. Dropping a $40 VNA is one thing. Dropping a $300
/archives//html/Towertalk/2019-11/msg00175.html (7,705 bytes)

92. Re: [TowerTalk] kt-34 info and help needed (score: 1)
Author: Steve London <n2icarrl@gmail.com>
Date: Tue, 10 Dec 2019 09:05:19 -0700
I have acquired a number of KT-34XA's over the years. They had at least two different boom designs. One design has the swaged sections. The other design has couplers that are inserted inside two adj
/archives//html/Towertalk/2019-12/msg00047.html (7,965 bytes)

93. [TowerTalk] OR-2800 Magnetic Reed Switch (score: 1)
Author: Steve London <n2icarrl@gmail.com>
Date: Fri, 14 Feb 2020 10:10:51 -0700
Anyone have the Mouser or Digi-Key part number for the OR-2800 magnetic reed switch ? Thanks, Steve, N2IC _______________________________________________ _____________________________________________
/archives//html/Towertalk/2020-02/msg00067.html (7,202 bytes)

94. Re: [TowerTalk] Yaesu G-2800 rotor pricing question (score: 1)
Author: Steve London <n2icarrl@gmail.com>
Date: Tue, 3 Mar 2020 09:08:45 -0700
I paid $500 for a used DXA+controller about 5 years ago, bought from a trusted source. On the outside, it looked great. It's been up for 5 years, turning a long boom, 6 element 15 with a 6 meter beam
/archives//html/Towertalk/2020-03/msg00016.html (9,115 bytes)

95. [TowerTalk] Stubs and Reactances in parallel (score: 1)
Author: Steve London <n2icarrl@gmail.com>
Date: Wed, 24 Jun 2020 12:20:15 -0600
This is a little complicated, so follow along if you are interested.... I have a 40 meter beam, and a rotatable, loaded, 80 meter dipole on the same mast, a few feet above the 40 meter beam. For year
/archives//html/Towertalk/2020-06/msg00167.html (8,544 bytes)

96. Re: [TowerTalk] Stubs and Reactances in parallel (score: 1)
Author: Steve London <n2icarrl@gmail.com>
Date: Wed, 24 Jun 2020 17:10:53 -0600
The antennas are fed separately. The stub on the 80 meter dipole does kill the interaction to the 40 meter beam. However, the Z of the stub is around 1000 ohms 80 meters, so it affects the 80 meter d
/archives//html/Towertalk/2020-06/msg00172.html (9,232 bytes)

97. Re: [TowerTalk] Stubs and Reactances in parallel (score: 1)
Author: Steve London <n2icarrl@gmail.com>
Date: Wed, 24 Jun 2020 17:12:11 -0600
It's used on CW and SSB. The loading coils in the matching network are shorted out by relays on SSB. 73, Steve, N2IC -- Why is the dipole resonant at 3.8? Are you using it there or only on CW? Wes N7
/archives//html/Towertalk/2020-06/msg00173.html (7,453 bytes)

98. Re: [TowerTalk] Tips for Modelling swaged antenna tubing sections (score: 1)
Author: Steve London <n2icarrl@gmail.com>
Date: Thu, 1 Oct 2020 06:59:14 -0600
but does the model actually show much difference? One can get way down in the weeds with this - put a tapered segment in that's 1 cm long, etc. But if the wavelength is 20 meters, a 1 cm transition i
/archives//html/Towertalk/2020-10/msg00000.html (7,321 bytes)

99. Re: [TowerTalk] Antennas for SO2R station (score: 1)
Author: Steve London <n2icarrl@gmail.com>
Date: Mon, 1 Mar 2021 12:52:17 -0700
Just wondering if anyone uses 2 antennas on the same mast for SO2R? -- There are stations that go a step further and use the same antenna for SO2R, with a triplexer (or even quadplexer). Of course, w
/archives//html/Towertalk/2021-03/msg00003.html (7,692 bytes)

100. [TowerTalk] Disassembling TIC 1022B (score: 1)
Author: Steve London <n2icarrl@gmail.com>
Date: Tue, 23 Mar 2021 13:26:23 -0600
I am trying to repair a well-used TIC 1022B. I need to separate the gear assembly from the motor. The keyed gear that slides on to the motor shaft is stuck. I have removed the screw on top of the gea
/archives//html/Towertalk/2021-03/msg00306.html (7,549 bytes)


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