Wonder why don´t you upgrade and insert a good stainless steel screw with
nuts instead those failing rivets. Optibeam is using this system and works
fantastic in their antennas
having a similar size and design as Force 12. 73!
Fernando EC1CT // KD0IGJ
E-Mail: ec1ct@esbesaya.com
KR DX Group
--------------------------------------------------
From: "Mickey Baker" <fishflorida@gmail.com>
Sent: Friday, February 18, 2011 5:07 PM
To: "Chet" <chetmoore@cox.net>
Cc: <towertalk@contesting.com>; "Barry Gross" <n1eu.barry@gmail.com>;
<n8de@thepoint.net>
Subject: Re: [TowerTalk] Force12 rivets
> I have seen several Force12 antennas that have failed in my part of the
> world in a tropical salt water environment due to corrosion and mechanical
> wear from wind.
>
> If I were assembling one, I'd be tempted to use swaged collar rivets:
> http://www.aircraftspruce.com/menus/ha/rivets.html
> These would hold better - they grip the tubing tighter because they deform
> the aluminum more under the collar of the rivet.
>
> I'd also use something to chemically protect the rivet
> (Boeshield/Corrosion-X) after it was installed.
>
> Careful drilling "perpendicular holes" - better to go down the length of
> the
> tubing a few cm so as not to provide a weak point in the element.
>
> 73,
>
> Mickey N4MB
>
> On Fri, Feb 18, 2011 at 10:13 AM, Chet <chetmoore@cox.net> wrote:
>
>> F-12 antennas are pre drilled at the factory. The instructions with mine
>> say
>> if there are 3 holes, use 3 rivets and insert all 3 rivets in the holes
>> and
>> don't pull any of them until you know all 3 line up. If they don't line
>> up
>> you probably have that particular element reversed.
>>
>> On some of the driven elements they drill a 4th hole in case you need to
>> adjust the SWR and on these elements only 3 of the 4 will line up. My
>> instructions didn't say anything about a 2 rivet rule.
>>
>> If you still have 2 out of 3 rivets,insert a new one. Not sure what kind
>> of
>> failure you had. Did the problematic rivet fall out, did it get pulled
>> all
>> the way through? Just put a new one in.
>>
>> 73
>>
>> Chet N4FX
>>
>> -----Original Message-----
>> From: towertalk-bounces@contesting.com
>> [mailto:towertalk-bounces@contesting.com] On Behalf Of n8de@thepoint.net
>> Sent: Friday, February 18, 2011 9:38 AM
>> To: Barry Gross
>> Cc: towertalk@contesting.com
>> Subject: Re: [TowerTalk] Force12 rivets
>>
>> I believe that the rule is:
>>
>> put two rivets at each location .. perpendicular to each other.
>>
>> Someone told me that in the past.
>>
>> 73
>> Don
>> N8DE
>>
>>
>> Quoting Barry Gross <n1eu.barry@gmail.com>:
>>
>> > I'm not sure if Force12 still uses riveted construction of yagi
>> > elements.
>> > In any event, I just experienced my first rivet failure on my C3S
>> > (great
>> > timing, huh?) and would like to avoid repeating this experience. What
>> > is
>> > the tried and true wisdom on preventing rivet failure on these
>> > antennas?
>> >
>> > Thanks & 73,
>> > Barry N1EU
>> > _______________________________________________
>> >
>> >
>> >
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>> > TowerTalk mailing list
>> > TowerTalk@contesting.com
>> > http://lists.contesting.com/mailman/listinfo/towertalk
>> >
>>
>>
>>
>> _______________________________________________
>>
>>
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>
>
>
> --
> Mickey Baker
> Fort Lauderdale, FL
> “Tell me, and I will listen. Show me, and I will understand. Involve me,
> and
> I will learn.” Teton Lakota, American Indian Saying.
> _______________________________________________
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