[TowerTalk] NASA & solar cycle 25

[W3AB/GEO]

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 at 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 at 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 at gmail.com>
>To: towertalk <towertalk at contesting.com>
>Subject: Re: [TowerTalk] Looking for a light coaxial
>Message-ID:
>	<CALWD7Z7_byq7-wJgBpke=UxT5Cq=BeUCijRa_nK9ivJ0FUfsJw at 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 at earthlink.net>
>To: <towertalk at 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 at aslinvc.com>
>To: "jim at audiosystemsgroup.com" <jim at audiosystemsgroup.com>,
>	"towertalk at contesting.com" <towertalk at contesting.com>
>Subject: Re: [TowerTalk] Looking for a light coaxial
>Message-ID: <49013bc5d89146cdbd054be1da008483 at 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
>******************************************