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
-----Original Message-----
From: towertalk-request <towertalk-request@contesting.com>
To: towertalk <towertalk@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)
----------------------------------------------------------------------
Message: 1
Date: Fri, 25 Jan 2019 09:03:13 -0500
From: "StellarCAT" <rxdesign@ssvecnet.com>
To: "tower" <towertalk@contesting.com>
Subject: [TowerTalk] K0XG rotating tower bolt issue...
Message-ID: <076D060926BE424A955A3760F1879778@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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