[TowerTalk] TowerTalk Digest, Vol 193, Issue 30

[cqtestk4xs at aol.com]

Over the years I've had four K0XG systems, two of them Rohn 55 and two Rohn 65.  Three were 200 footers and one was a 90 footer.  All of them were pretty loaded.  
The building dep't made me go to 3/4 inch J-bolts.  However, what these guys know about towers you could put in a thimble.  They're the same guys who wanted a 5 by 5 by 5 foot hole totally filled with concrete for the anchors on a 90 foot Rohn 45 tower.
Back in FL I used only 1/2 inch J-bolts and never had an issue with them.  Out here the 3/4 inch ones have not been an issue either.  Of course, we have not had any Cat-5 come through either.   The J-bolts are of course galvanized so no issues with rust.  Using grade 8 bolts might be an issue if not galvanized.
Final thought on this.  Unless you have some really tough antennas, things start to disassemble around 80-90 MPH, which of course takes the strain off the tower and associated hardware, so beefing up the bolts may not be an issue.   
Bill KH7XS/K4XS


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To: towertalk <towertalk at contesting.com>
Sent: Fri, Jan 25, 2019 5:00 pm
Subject: TowerTalk Digest, Vol 193, Issue 30

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Today's Topics:

  1. K0XG rotating tower bolt issue... (StellarCAT)


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Message: 1
Date: Fri, 25 Jan 2019 09:03:13 -0500
From: "StellarCAT" <rxdesign at ssvecnet.com>
To: "tower" <towertalk at contesting.com>
Subject: [TowerTalk] K0XG rotating tower bolt issue...
Message-ID: <076D060926BE424A955A3760F1879778 at RXDesignDell>
Content-Type: text/plain;    charset="utf-8"

Anyone else have issues with the bolts that hold the tower baseplate to the main gear? I went to grade 8 bolts here as to me this is not a good idea to have those VERY long bolts (7?) holding these two things together ? and they?re only 1/2? diameter! One of mine is obviously BENT! I don?t know how I could enlarge the holes now that it is together ? I?d MUCH prefer these were 3/4? or at least 5/8? bolts. I?ve not had heavy winds here since it went up in October of ?16... maybe 60 Mph tops. I?m also considering going with a stainless tube ? 1/2? ID and maybe 3/16? walls, as a sleeve around the bolts ? but it would need to be tight fitting to make any difference, both on the ID as well as the length (height). Another down side of doing this is that the grade 8 bolts are zinc chromate ? they?re pristine now ? but put them in a tube, what might end up being a sealed system if properly done (tight enough) might trap enough moisture to corrode them (much?) faster... 

Gary 
K9RX

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End of TowerTalk Digest, Vol 193, Issue 30
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