[TowerTalk] TowerTalk Digest, Vol 182, Issue 20

cqtestk4xs at aol.com cqtestk4xs at aol.com
Wed Feb 14 15:53:49 EST 2018


They are too short for some kinds of soils, like sand and thick grass.  Another problem, if they come loose, they make great tire puncture devices for the yard tractor.  The 6 inch staples stay put.
 
73  K4XS/KH7XS
 
 
-----Original Message-----
From: towertalk-request <towertalk-request at contesting.com>
To: towertalk <towertalk at contesting.com>
Sent: Wed, Feb 14, 2018 8:27 pm
Subject: TowerTalk Digest, Vol 182, Issue 20

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Today's Topics:

   1. Re: Topband: 160 vertical advice (Rob Atkinson)
   2.  Sod staples (Rob Atkinson)
   3. Re: Topband: 160 vertical advice (john at kk9a.com)
   4. F-12  EF  240/230 (Wayne Kline)
   5. Al-to-Al (Kim Elmore)
   6. Re: Al-to-Al (Dick's)
   7.  Al-to-Al (john at kk9a.com)
   8. Re: Al-to-Al (Bob K6UJ)
   9. Re: Al-to-Al (Tim Duffy)
  10. Re: Al-to-Al (Steve Bookout)
  11. Re: Al-to-Al (john at kk9a.com)
  12. Re: Al-to-Al (Tim Duffy)
  13. Re: Al-to-Al (Kirk Kleinschmidt)
  14. Re: Al-to-Al (Patrick Greenlee)


----------------------------------------------------------------------

Message: 1
Date: Tue, 13 Feb 2018 11:21:04 -0600
From: Rob Atkinson <ranchorobbo at gmail.com>
To: towertalk <towertalk at contesting.com>
Subject: Re: [TowerTalk] Topband: 160 vertical advice
Message-ID:
	<CALWD7Z48QKQFmcyQ6rpewYM5cmo8s2H3T72A1V8zJ9mAErypyQ at mail.gmail.com>
Content-Type: text/plain; charset="UTF-8"

Typically a series fed inverted L that's 1/8 vertical roughly, and the
rest horizontal over an adequate buried ground system will give a
feedpoint impedance of around 10 to 15 ohms and a mismatched to 50 ohm
vswr of 4 or 5:1.  Usually when the feedpoint impedance is much higher
there's ground loss.

73

Rob
K5UJ


------------------------------

Message: 2
Date: Tue, 13 Feb 2018 12:10:15 -0600
From: Rob Atkinson <ranchorobbo at gmail.com>
To: towertalk <towertalk at contesting.com>
Subject: [TowerTalk]  Sod staples
Message-ID:
	<CALWD7Z4Oh2kB6QDH6yNiKpmbaXvVHG=uPrO7AQpOtyDtEhaMGQ at mail.gmail.com>
Content-Type: text/plain; charset="UTF-8"

What worked for me were the large barb wire fence staples.  Go to a
farmers co-op and look for them.  At the one I went to they had bins
with different sizes, and the largest ones were thick with sharp
prongs about 1 1/2 inches long.  Not too long but pound them into the
ground and they'll stay, and they won't bend if you hit a rock.  you
can pound them into cracks in limestone and other more dense surfaces.
They are sold by the pound and when I bought mine I got a pound for
$9.  I have rocky soil and the wire staples bent all the time.

73

Rob
K5UJ


------------------------------

Message: 3
Date: Tue, 13 Feb 2018 13:33:56 -0500
From: "john at kk9a.com" <john at kk9a.com>
To: towertalk at contesting.com
Subject: Re: [TowerTalk] Topband: 160 vertical advice
Message-ID: <2e7e1951ceea1ee650189928bca47081.squirrel at www11.qth.com>
Content-Type: text/plain;charset=utf-8

Bill has a great location and signals travel well over the sea. I do not
know the details of his antennas other than the impedance and bandwidth
seem better than they should be. Just as an example if he had 5dB of
ground loss you would still probably have no problem copying him during
peak openings.


John KK9A


To:	cqtestk4xs at aol.com
Subject:	Re: Topband: 160 vertical advice
From:	Don Kirk <wd8dsb at gmail.com>
Date:	Mon, 12 Feb 2018 17:36:58 -0500

Hi Bill,

As Wes already mentioned, your SWR bandwidth is suspicious as is your
minimum SWR.  Nevertheless your signal this morning was pretty much on par
with the strongest signals I have ever heard from KH6 land on 160 meters.

When I worked you this morning signals were not that great, but after our
QSO your signal really came up.  Your signal came up so much that I decided
to record one of your CQs at around 0608 UTC when you were running around
10 dB over my noise floor, and I even saw your signal increase to around 15
dB over my noise floor for a while a bit later on.  Your RX capabilities
appeared to be pretty good too since you copied my measly 100 watts before
signals really came up.

I just uploaded a recording of your CQ when you were running around 10 dB
over my noise floor, and here is the youtube link to the recording
http://www.youtube.com/watch?v=iF10bDQFowU&feature=youtu.be

73,
Don (wd8dsb)



------------------------------

Message: 4
Date: Tue, 13 Feb 2018 19:14:53 +0000
From: Wayne Kline <w3ea at hotmail.com>
To: "TOWERTALK at contesting.com" <TOWERTALK at contesting.com>
Subject: [TowerTalk] F-12 EF  240/230
Message-ID:
	<BL2PR20MB0866E0CB434750DCB0C0D1EB8FF60 at BL2PR20MB0866.namprd20.prod.outlook.com>
	
Content-Type: text/plain; charset="iso-8859-1"

TT'ers

 I picked up a  F-12 EF 240/230 antenna. Having installed many F-12 antennas over the years, am aware of some of the original drawings and  production  models (  pre drilled rivet holes )  measurement  did not match up. Speaking to Tom a the time ( cell phone in the field ) alleviated the fears  during assembly and installation.
   I am hoping this is the issue I have at the moment.

 The  Drawing I have has  both the  Elite Force EF 240/230 interlaced dimensions  and also the singular  EF 240X @ 24 foot boom and the  EF-230 @ 12 ft spacing.

  The pre riveted boom to element  brackets hold true for the  2X40  BUT the   2X30 spacing is  4 " inches short   NOT 12 ft  C/L   but 11'8" C/L  .....  Might be a moot point  but just  wanted to shake the tree of Knowledge

thanks

Wayne W3EA


------------------------------

Message: 5
Date: Tue, 13 Feb 2018 16:09:26 -0600
From: Kim Elmore <cw_de_n5op at sbcglobal.net>
To: towertalk at contesting.com
Subject: [TowerTalk] Al-to-Al
Message-ID: <BF688E8B-0F3A-471C-A200-C6ED5760AFEE at sbcglobal.net>
Content-Type: text/plain;	charset=us-ascii

When assembling Al -to-Al junctions in an Antenna, what anti-corrosion compound should be used at the joints?

Kim N5OP

"People that make music together cannot be enemies, at least as long as the music lasts." -- Paul Hindemith

------------------------------

Message: 6
Date: Tue, 13 Feb 2018 18:13:05 -0500
From: Dick's <rcblumen at centurylink.net>
To: Kim Elmore <cw_de_n5op at sbcglobal.net>
Cc: towertalk at contesting.com
Subject: Re: [TowerTalk] Al-to-Al
Message-ID: <7DF7E91F-6F57-4C92-AC63-2BEEC928576A at centurylink.net>
Content-Type: text/plain;	charset=utf-8

Ilsco De-ox

Ilsco DE-OX-8OZ Oxide Inhibitor Bottle 8 oz DE-OX https://www.amazon.com/dp/B008KM6AQ8/ref=cm_sw_r_sms_c_api_8b3GAbX7B4WHQ

Or from another supplier.


Dick, K0CAT
      ??-
> On Feb 13, 2018, at 5:09 PM, Kim Elmore <cw_de_n5op at sbcglobal.net> wrote:
> 
> When assembling Al -to-Al junctions in an Antenna, what anti-corrosion compound should be used at the joints?
> 
> Kim N5OP
> 
> "People that make music together cannot be enemies, at least as long as the music lasts." -- Paul Hindemith
> _______________________________________________
> 
> 
> 
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk


------------------------------

Message: 7
Date: Tue, 13 Feb 2018 18:40:46 -0500
From: <john at kk9a.com>
To: <towertalk at contesting.com>
Cc: <cw_de_n5op at sbcglobal.net>
Subject: [TowerTalk] Al-to-Al
Message-ID: <00d701d3a524$1490b570$3db22050$@com>
Content-Type: text/plain;	charset="us-ascii"

For many years in Illinois I used nothing and never had an issue.  When I
bought a home in Aruba and saw what corrosion was really like I started
using Penetrox. I had no element corrosion connection issues and when I took
the antennas apart years later the tubing easily separated. There was still
bad element aluminum corrosion caused by the stainless steel hose clamps
however that is a different issue. Now I use Penetrox on all permanent
antennas, regardless of location.  

John KK9A 


To:	towertalk at contesting.com
Subject:	[TowerTalk] Al-to-Al
From:	Kim Elmore <cw_de_n5op at sbcglobal.net>
Date:	Tue, 13 Feb 2018 16:09:26 -0600

When assembling Al -to-Al junctions in an Antenna, what anti-corrosion
compound 
should be used at the joints?

Kim N5OP



------------------------------

Message: 8
Date: Tue, 13 Feb 2018 23:44:45 +0000 (UTC)
From: Bob K6UJ <k6uj at pacbell.net>
To: Kim Elmore <cw_de_n5op at sbcglobal.net>, 	"towertalk at contesting.com"
	<towertalk at contesting.com>
Subject: Re: [TowerTalk] Al-to-Al
Message-ID: <1538611273.416869.1518565485271 at mail.yahoo.com>
Content-Type: text/plain; charset=UTF-8

Kim,
You will get several suggestions on this.? I use Penetrox.? Used it on aluminum antenna element joints for years.? Does a great job of preventing corrosion and preserving the aluminum.? I have taken apart yagis that have been up for over 20 years and the exterior of the aluminum tubes were corroded, naturally, but the internal mating surfaces where the penetrox was used were shiny and bright, like new.? I first started using it years ago on KLM antennas, they provided a tube with their antennas, and still use it.DX engineering has it :https://www.dxengineering.com/parts/dxe-p8a


BobK6UJ



      From: Kim Elmore <cw_de_n5op at sbcglobal.net>
 To: towertalk at contesting.com 
 Sent: Tuesday, February 13, 2018 2:09 PM
 Subject: [TowerTalk] Al-to-Al
   
When assembling Al -to-Al junctions in an Antenna, what anti-corrosion compound should be used at the joints?

Kim N5OP

"People that make music together cannot be enemies, at least as long as the music lasts." -- Paul Hindemith
_______________________________________________



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TowerTalk mailing list
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http://lists.contesting.com/mailman/listinfo/towertalk


 

------------------------------

Message: 9
Date: Tue, 13 Feb 2018 19:56:45 -0500
From: "Tim Duffy" <k3lr at k3lr.com>
To: "'Bob K6UJ'" <k6uj at pacbell.net>, "'Kim Elmore'"
	<cw_de_n5op at sbcglobal.net>,	<towertalk at contesting.com>
Subject: Re: [TowerTalk] Al-to-Al
Message-ID: <8EA31119F23C4080BAC38ACD603B2A39 at laptop>
Content-Type: text/plain;	charset="iso-8859-1"

I used Penetrox for years - noticed that after 10 years or more that the
Penetrox would dry out and turn to a crusty dust. I mentioned that to W3LPL.
Frank said try Jet Lube SS-30 - which is what he uses at his mega station
for all of his antennas.

I have been sold on Jet Lube SS-30 ever since. After 25 years here at K3LR -
the Jet Lube SS-30 comes apart and is clean and offers a great low loss
connection. I use it everywhere hardware and connections are involved (even
in the shack) - as does W3LPL. Do not worry that this is copper based paste
- it works SUPER for Al to Al.

https://www.dxengineering.com/parts/jtl-12555

73
Tim K3LR

-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of Bob
K6UJ
Sent: Tuesday, February 13, 2018 6:45 PM
To: Kim Elmore; towertalk at contesting.com
Subject: Re: [TowerTalk] Al-to-Al

Kim,
You will get several suggestions on this.? I use Penetrox.? Used it on
aluminum antenna element joints for years.? Does a great job of preventing
corrosion and preserving the aluminum.? I have taken apart yagis that have
been up for over 20 years and the exterior of the aluminum tubes were
corroded, naturally, but the internal mating surfaces where the penetrox was
used were shiny and bright, like new.? I first started using it years ago on
KLM antennas, they provided a tube with their antennas, and still use it.DX
engineering has it :https://www.dxengineering.com/parts/dxe-p8a


BobK6UJ



      From: Kim Elmore <cw_de_n5op at sbcglobal.net>
 To: towertalk at contesting.com 
 Sent: Tuesday, February 13, 2018 2:09 PM
 Subject: [TowerTalk] Al-to-Al
   
When assembling Al -to-Al junctions in an Antenna, what anti-corrosion
compound should be used at the joints?

Kim N5OP

"People that make music together cannot be enemies, at least as long as the
music lasts." -- Paul Hindemith
_______________________________________________



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_______________________________________________



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------------------------------

Message: 10
Date: Tue, 13 Feb 2018 20:36:23 -0500
From: Steve Bookout <steve at nr4m.com>
To: towertalk at contesting.com
Subject: Re: [TowerTalk] Al-to-Al
Message-ID: <6d0cbb0b-5327-500d-0d3e-2ecdf5b1d470 at nr4m.com>
Content-Type: text/plain; charset=utf-8; format=flowed

I must agree with Tim on this.? This stuff has never let me down.
To make a bit easier to apply, and although it may be a 'sin', I apply 
it to the inner element, then spray WD-40 on it and spread it with vinyl 
gloved hand.
Goes on a bit more even this way.

73 de Steve, NR4M

On 2/13/2018 7:56:PM, Tim Duffy wrote:
> I used Penetrox for years - noticed that after 10 years or more that the
> Penetrox would dry out and turn to a crusty dust. I mentioned that to W3LPL.H
> Frank said try Jet Lube SS-30 - which is what he uses at his mega station
> for all of his antennas.
>
> I have been sold on Jet Lube SS-30 ever since. After 25 years here at K3LR -
> the Jet Lube SS-30 comes apart and is clean and offers a great low loss
> connection. I use it everywhere hardware and connections are involved (even
> in the shack) - as does W3LPL. Do not worry that this is copper based paste
> - it works SUPER for Al to Al.
>
> https://www.dxengineering.com/parts/jtl-12555
>
> 73
> Tim K3LR
>
> -----Original Message-----
> From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of Bob
> K6UJ
> Sent: Tuesday, February 13, 2018 6:45 PM
> To: Kim Elmore; towertalk at contesting.com
> Subject: Re: [TowerTalk] Al-to-Al
>
> Kim,
> You will get several suggestions on this.? I use Penetrox.? Used it on
> aluminum antenna element joints for years.? Does a great job of preventing
> corrosion and preserving the aluminum.? I have taken apart yagis that have
> been up for over 20 years and the exterior of the aluminum tubes were
> corroded, naturally, but the internal mating surfaces where the penetrox was
> used were shiny and bright, like new.? I first started using it years ago on
> KLM antennas, they provided a tube with their antennas, and still use it.DX
> engineering has it :https://www.dxengineering.com/parts/dxe-p8a
>
>
> BobK6UJ
>
>
>
>        From: Kim Elmore <cw_de_n5op at sbcglobal.net>
>   To: towertalk at contesting.com
>   Sent: Tuesday, February 13, 2018 2:09 PM
>   Subject: [TowerTalk] Al-to-Al
>     
> When assembling Al -to-Al junctions in an Antenna, what anti-corrosion
> compound should be used at the joints?
>
> Kim N5OP
>
> "People that make music together cannot be enemies, at least as long as the
> music lasts." -- Paul Hindemith
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
>
>     
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>



------------------------------

Message: 11
Date: Tue, 13 Feb 2018 21:17:06 -0500
From: <john at kk9a.com>
To: <towertalk at contesting.com>
Subject: Re: [TowerTalk] Al-to-Al
Message-ID: <000501d3a539$e9472870$bbd57950$@com>
Content-Type: text/plain;	charset="us-ascii"

Great tip, Tim. I have seen dry Penetrox on old antennas but I assume that
it does not affect the joint's conductivity. Jet Lube SS-30 has excellent
Amazon reviews. I wonder how the following note on the manufacture's website
relates to aluminum tubing antennas, especially those in corrosive
environments: "Not intended for use with aluminum where galvanic corrosion
could be a significant issue".

John KK9A


To:	"'Bob K6UJ'" <k6uj at pacbell.net>, "'Kim Elmore'"
<cw_de_n5op at sbcglobal.net>,	<towertalk at contesting.com>
Subject:	Re: [TowerTalk] Al-to-Al
From:	"Tim Duffy" <k3lr at k3lr.com>
Reply-to:	k3lr at k3lr.com
Date:	Tue, 13 Feb 2018 19:56:45 -0500

I used Penetrox for years - noticed that after 10 years or more that the
Penetrox would dry out and turn to a crusty dust. I mentioned that to W3LPL.
Frank said try Jet Lube SS-30 - which is what he uses at his mega station
for all of his antennas.

I have been sold on Jet Lube SS-30 ever since. After 25 years here at K3LR -
the Jet Lube SS-30 comes apart and is clean and offers a great low loss
connection. I use it everywhere hardware and connections are involved (even
in the shack) - as does W3LPL. Do not worry that this is copper based paste
- it works SUPER for Al to Al.

https://www.dxengineering.com/parts/jtl-12555

73
Tim K3LR





------------------------------

Message: 12
Date: Tue, 13 Feb 2018 21:41:14 -0500
From: "Tim Duffy" <k3lr at k3lr.com>
To: <john at kk9a.com>,	<towertalk at contesting.com>
Subject: Re: [TowerTalk] Al-to-Al
Message-ID: <6C1390508E0B4297A22ADDBF62FEA177 at laptop>
Content-Type: text/plain;	charset="us-ascii"

I have had conversations with W3LPL and others (mechanical engineers) about
that comment - and we all agree that we have never had a problem with SS-30.
The AL to AL joints are clean even after 20 plus years - perfect. I think
SS-30 might be a problem with dissimilar metals or highly corrosive
environments.

I can also tell you that major cell phone carriers (one of which I worked at
in the past) - are all using SS-30 for their site builds. They stopped using
Penetrox long ago.

If SS-30 wasn't the best - I wouldn't have used it on the 50 plus antennas
here at K3LR.

73
Tim K3LR

-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of
john at kk9a.com
Sent: Tuesday, February 13, 2018 9:17 PM
To: towertalk at contesting.com
Subject: Re: [TowerTalk] Al-to-Al

Great tip, Tim. I have seen dry Penetrox on old antennas but I assume that
it does not affect the joint's conductivity. Jet Lube SS-30 has excellent
Amazon reviews. I wonder how the following note on the manufacture's website
relates to aluminum tubing antennas, especially those in corrosive
environments: "Not intended for use with aluminum where galvanic corrosion
could be a significant issue".

John KK9A


To:	"'Bob K6UJ'" <k6uj at pacbell.net>, "'Kim Elmore'"
<cw_de_n5op at sbcglobal.net>,	<towertalk at contesting.com>
Subject:	Re: [TowerTalk] Al-to-Al
From:	"Tim Duffy" <k3lr at k3lr.com>
Reply-to:	k3lr at k3lr.com
Date:	Tue, 13 Feb 2018 19:56:45 -0500

I used Penetrox for years - noticed that after 10 years or more that the
Penetrox would dry out and turn to a crusty dust. I mentioned that to W3LPL.
Frank said try Jet Lube SS-30 - which is what he uses at his mega station
for all of his antennas.

I have been sold on Jet Lube SS-30 ever since. After 25 years here at K3LR -
the Jet Lube SS-30 comes apart and is clean and offers a great low loss
connection. I use it everywhere hardware and connections are involved (even
in the shack) - as does W3LPL. Do not worry that this is copper based paste
- it works SUPER for Al to Al.

https://www.dxengineering.com/parts/jtl-12555

73
Tim K3LR



_______________________________________________



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TowerTalk mailing list
TowerTalk at contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk



------------------------------

Message: 13
Date: Wed, 14 Feb 2018 02:47:17 +0000 (UTC)
From: Kirk Kleinschmidt <sohosources at yahoo.com>
To: "towertalk at contesting.com" <towertalk at contesting.com>
Subject: Re: [TowerTalk] Al-to-Al
Message-ID: <721177450.545007.1518576437856 at mail.yahoo.com>
Content-Type: text/plain; charset=UTF-8

In looking up details about SS-30, I notice that the company makes a very similar sounding product called Kopr-Kote, which is about haf the price.
Not that the price for SS-30 is unreasonable, but I'm just wondering if anyone knows whether the products are interchangeable for ham radio use, or if SS-30 is decidedly better for some reason(s).
Thanks,
--Kirk in MN?My book, "Stealth Amateur Radio," is now available from www.stealthamateur.com and on the Amazon Kindle (soon) 

    On Tuesday, February 13, 2018 8:18 PM, "john at kk9a.com" <john at kk9a.com> wrote:
 

 Great tip, Tim. I have seen dry Penetrox on old antennas but I assume that
it does not affect the joint's conductivity. Jet Lube SS-30 has excellent
Amazon reviews. I wonder how the following note on the manufacture's website
relates to aluminum tubing antennas, especially those in corrosive
environments: "Not intended for use with aluminum where galvanic corrosion
could be a significant issue".

John KK9A


To:??? "'Bob K6UJ'" <k6uj at pacbell.net>, "'Kim Elmore'"
<cw_de_n5op at sbcglobal.net>,??? <towertalk at contesting.com>
Subject:??? Re: [TowerTalk] Al-to-Al
From:??? "Tim Duffy" <k3lr at k3lr.com>
Reply-to:??? k3lr at k3lr.com
Date:??? Tue, 13 Feb 2018 19:56:45 -0500

I used Penetrox for years - noticed that after 10 years or more that the
Penetrox would dry out and turn to a crusty dust. I mentioned that to W3LPL.
Frank said try Jet Lube SS-30 - which is what he uses at his mega station
for all of his antennas.

I have been sold on Jet Lube SS-30 ever since. After 25 years here at K3LR -
the Jet Lube SS-30 comes apart and is clean and offers a great low loss
connection. I use it everywhere hardware and connections are involved (even
in the shack) - as does W3LPL. Do not worry that this is copper based paste
- it works SUPER for Al to Al.

https://www.dxengineering.com/parts/jtl-12555

73
Tim K3LR



_______________________________________________



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TowerTalk mailing list
TowerTalk at contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk


 

------------------------------

Message: 14
Date: Wed, 14 Feb 2018 08:30:13 -0600
From: Patrick Greenlee <patrick_g at windstream.net>
To: towertalk at contesting.com
Subject: Re: [TowerTalk] Al-to-Al
Message-ID: <ec8e9fcf-25f7-0a40-f3a4-82afb28b6940 at windstream.net>
Content-Type: text/plain; charset=utf-8; format=flowed



On 2/13/2018 8:47 PM, Kirk Kleinschmidt via TowerTalk wrote:
> "Not intended for use with aluminum where galvanic corrosion
> could be a significant issue".
>
If I saw comments from the MFG telling me to not use the product where 
galvanic corrosion could be significant I'd listen up.

Galvanic corrosion is another way of saying dissimilar metals corrosion. 
 ? If?? A L L ? metals in contact with each other are the same then no 
galvanic corrosion. I'd be leery of a powdered copper in a paste agent 
on an aluminum to aluminum or aluminum to xxxx joint.

Back when the big rocks were still hot I took a sabbatical and did some 
marine field service engineering.? (Commercial radiotelephone lisc with 
ship's radar endorsement) I saw lots of antenna installations where coax 
shields were connected to aluminum antenna mounts welded to the vessel's 
aluminum superstructure. Typically a stainless steel bolt would hold a 
tin coated copper terminal (ring or spade) to the aluminum antenna 
mount, sometimes with silicone caulk over the connection.? Galvanic 
corrosion ate big pits or made holes in the aluminum.? Improperly 
protected shield would be mush or gone and sometimes the terminals were 
eaten or nearly so themselves.

The longest lasting connections seemed to be with stainless bolts with 
stainless flat washers on both sides of the aluminum.? The ring or spade 
terminal would then only contact the stainless. Generous cover of 
silicone caulk over all exposed coax shield, crimp terminals, and all of 
the stainless mounting hardware.? YMMV? but this is what I saw.?? Oh, 
some techs painted all exposed non aluminum components in the mix with 
liquid tape before covering with silicone caulk.? They used the GE 50? 
year caulk, not the cheaper varieties.

Patrick??????? NJ5G


------------------------------

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End of TowerTalk Digest, Vol 182, Issue 20
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