While not about towers, it's about why we have towers.
https://www.noaa.gov/media-release/noaa-nasa-to-discuss-solar-cycle-prediction-sept-15
73 de W3AB
On Sep 12, 2020, 09:00, at 09:00, towertalk-request@contesting.com wrote:
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>Today's Topics:
>
> 1. Re: Looking for a light coaxial (Rob Atkinson)
> 2. Re: Looking for a light coaxial (sawyered@earthlink.net)
> 3. Re: Looking for a light coaxial (David Aslin G3WGN)
>
>
>----------------------------------------------------------------------
>
>Message: 1
>Date: Sat, 12 Sep 2020 05:20:33 -0500
>From: Rob Atkinson <ranchorobbo@gmail.com>
>To: towertalk <towertalk@contesting.com>
>Subject: Re: [TowerTalk] Looking for a light coaxial
>Message-ID:
> <CALWD7Z7_byq7-wJgBpke=UxT5Cq=BeUCijRa_nK9ivJ0FUfsJw@mail.gmail.com>
>Content-Type: text/plain; charset="UTF-8"
>
>It's a fixed non-rotatable wire beam. A balanced antenna. Feed it
>with balanced line. Light weight ladder line in the 400 to 600 ohm
>range. You can use AWG 16 stranded. No baluns, significant loss,
>heavy coax or other coax nonsense. Connections and splices can be
>done with banana plugs and jacks and split bolts. Save the unbalanced
>line for shack use and feeding UNbalanced loads such as 80 or 160 m.
>monopoles. How long is your feedline run?
>
>You'll need a balanced link coupled matching network which is easy to
>build or buy, and a way to bring the line into your transmitter room
>but that's all fairly easy if you don't freak out and give up.
>
>Now, if you are unable to wrap your head around anything other than
>unbalanced line, then I'd look at 3/8 inch foam dielectric heliax. I
>think it is much easier to work with than the LMR stuff and it doesn't
>weigh much. I'd make a 180 degree turn with it at the feed point by
>making it do a half loop up and down to the balun to make it harder
>for water to wick up into the foam if there's ever a leak. This also
>provides strain relief. But remember, balanced line removes a lot of
>issues like high loss due to band edge high vswr on the line. If the
>run is several hundred feet long then I would not consider coax at
>all.
>
>73
>
>Rob
>K5UJ
>
>
>------------------------------
>
>Message: 2
>Date: Sat, 12 Sep 2020 06:59:35 -0400
>From: <sawyered@earthlink.net>
>To: <towertalk@contesting.com>
>Subject: Re: [TowerTalk] Looking for a light coaxial
>Message-ID: <001501d688f3$cde00750$69a015f0$@earthlink.net>
>Content-Type: text/plain; charset="us-ascii"
>
>My choice has always been high quality LMR240 (RG8X size). It would be
>about 0.4db for 100ft on 80M. There really isn't a better option. I
>use it
>on my 80M center fed slopers.
>
>
>
>Ed N1UR
>
>
>
>------------------------------
>
>Message: 3
>Date: Sat, 12 Sep 2020 12:55:07 +0000
>From: David Aslin G3WGN <david@aslinvc.com>
>To: "jim@audiosystemsgroup.com" <jim@audiosystemsgroup.com>,
> "towertalk@contesting.com" <towertalk@contesting.com>
>Subject: Re: [TowerTalk] Looking for a light coaxial
>Message-ID: <49013bc5d89146cdbd054be1da008483@THHSTE15D2BE6.hs20.net>
>Content-Type: text/plain; charset="utf-8"
>
>Jorge & Jim,
>That EU brand is Messi & Paolini. Our 6Gs DXpedition group has used
>their cables on all our trips.
>Aircell 5 is 5mm and light weight, but may not have the power handling
>you seek, so take a look at their Airborne range which was developed
>for optimum performance/weight.
>73, David G3WGN M6O
>
>
>
>Sent from my Samsung Galaxy smartphone.
>
>
>------------------------------
>
>Subject: Digest Footer
>
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>------------------------------
>
>End of TowerTalk Digest, Vol 213, Issue 16
>******************************************
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