Hi Ed,
Kim is correct, the actual tower sections being discussed are the same -
but you can use smaller ones OR bigger ones to get to a given height.
The towers made of the bigger sections are the stronger towers. The 64
foot one ("BX64") uses all the possible sections starting with the
biggest one they made at the bottom (#8) and the smallest one they made
at the top (#1). It goes the highest and holds up the least.
I special ordered an HDBX32 once (#8, #7, #6, #5) and they just put a
top section and a rotor plate into a #5 section for me. Problem solved.
73 - Mark N5OT
On 7/5/2019 5:29 PM, Ed Williams wrote:
Hi All,
The BX tower consists of three different version. There is a BX, HBX and the
HDBX and each increasing the strength of the tower. So please specify which
version you are referring to. I have owned all three of the version at one
time.
73, de KN4KL ed
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of Kim
Elmore
Sent: Friday, July 05, 2019 3:24 PM
To: Mark - N5OT
Cc: towertalk@contesting.com
Subject: Re: [TowerTalk] HDBX Version History...
Yes, from what I understand now, you are correct. According to some info in found in some
archives, Rohn redesigned the AX, creating the BX (B-model using X bracing, I guess). Not
only did they add an X-brace to each section, but they made the steel gauge heavier for at
least the tower legs. From what I read, I couldn’t tell if they made the X-braces
themselves heavier, or if they beefed up the aluminum rivets. I also don’t know if (or
how much) Rohn modified the published data on their beefed-up BX series. If they left it
unchanged from the original AX, it would leave them a much larger safety margin.
Kim N5OP
"People that make music together cannot be enemies, at least as long as the music
lasts." -- Paul Hindemith
On Jul 5, 2019, at 11:37 AM, Mark - N5OT <r-emails@n5ot.com> wrote:
I am enjoying Kim's thread on BX towers. Steve mentioned that the other guy
had an AX not a BX and I need some clarification from guys who know more than I
do. If the fellow who's antenna twisted itself to pieces had and AX I would
have thought the more notable deal with the X-bracing would be that on the AX
the braces don't take up as much vertical space, and don't touch each other.
On the BX they do. Clearly the BX is a better design? (Hell to climb though,
just sayin'):
Examples of what I am talking about:
https://www.n5ot.com/AX.jpg
https://www.n5ot.com/BX.jpg
If I have this wrong I would appreciate knowing it.
Thanks,
73 - Mark N5OT
On 7/2/2019 3:22 PM, Kim Elmore wrote:
Ah! OK — I began to wonder if I was losing my marbles. Well... I obviously lost
‘em long ago, but still...
Kim N5OP
"People that make music together cannot be enemies, at least as long as the music
lasts." -- Paul Hindemith
On Jul 2, 2019, at 11:49 AM, k7lxc@aol.com wrote:
I recently asked a question about HDBX 48 torque loading. Another
towertalkian told me his failed in about 80 MPH winds. He sent me a
picture of his failed HDBX 48 (more heavily loaded than mine by a fair
bit) that failed. Something I noticed in the picture was that his
HDBX48?? had only *five* X-braces per section; I thought it looked odd,
so I went out and looked at mine: mine has *six* X-braces per section.
He said his was manufactured sometime around 1968-1970 while mine was
put up around 1986, so was probably made around that time.
Did Rohn change the design of their BX towers to add another X-brace to
each section, or am I seeing things?
Nope, your eyesight is ok. The original tower you saw was the AX.
Cheers,
Steve K7LXC
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