You do not flod the inside DAH! Coat the darn stuff on the ouside DAH!
--
Jim K9TF
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Topband Reflector Archives - http://www.contesting.com/_topband
: Verifying integrity of 75 ohm coax.
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Topband Reflector Archives - http://www.contesting.com/_topband
When Vaseline dries out thats telling you that air is getting in. If air
is getting in, moisture is getting in and contaminating to cable and
connector.
Same goes with what ever dielectric you use as well.
--
Jim K9TF
_
Topband Reflector Archives -
Anything is possible, but I know what I used and saw, Tom. It was a small
squeeze tube labeled silicone dielectric grease.
I was the only person that serviced electronic equipment in that company
where I worked full-time. I put that stuff on an expensive feed rate switch
on an Allen-Bradley CNC
Very soon afterwards (a few weeks instead of perhaps a year), the
operator called me over to show me the problem with that switch. I know
what I saw, and I am convinced that it is abrasive. That grease
accelerated
the failure of that switch by a tremendous amount.
This is very interesting
Thanks for your thoughts on this. But all this tells me is that some
silicone dielectric greases may not be abrasive. I am certain that some
are, because I am not the only one who has experienced this.
The stuff I used was either from Radio Shack or an automotive parts store.
It was in a small
Max,
Do you remember what the brand, etc. it was? Potable here just means it's
approved by the FDA for use in drinking water systems.
73, Mike
www.w0btu.com
On Sun, Nov 24, 2013 at 7:10 AM, Max Cotton airra...@dsl.pipex.com wrote:
... I am convinced that it is abrasive. That grease
Thanks for your thoughts on this. But all this tells me is that some
silicone dielectric greases may not be abrasive. I am certain that some
are, because I am not the only one who has experienced this.
I have no doubt you experienced contact wear, which is not unusual for
contacts that arc
from my Verizon Wireless 4G LTE Smartphone
Original message
From: Tom W8JI w...@w8ji.com
Date: 11/24/2013 6:11 AM (GMT-07:00)
To: Mike Waters mikew...@gmail.com,topband topband@contesting.com
Subject: Re: Topband: Verifying integrity of 75 ohm coax.
Anything is possible
Silicone is totally different from silica. Silica in its most common form
is sand. Silicone is a name for a class of compounds based on the
element silicon. The properties can vary significantly. Silicones are
commonly used for lubrication and defoaming applications. 73, Greg-N4CC
Just to
Actually, that flies in the face of everything published about typical
silicone dielectric greases.
Tom,
I would tend to agree with you on this point, maybe it was the switch just
breaking down ( Only digital signals no high voltages) and the small metal
particles were causing further damage
On Sun, Nov 24, 2013 at 9:08 AM, Tom W8JI w...@w8ji.com wrote:
... But all this tells me is that some silicone dielectric greases may not
be abrasive.
... contact wear, which is not unusual for contacts that arc when
switched ... caused by the arc carburizing the grease into a
FWIW, the silicone grease that I have used more recently has been Dow Corning
MS4. That is specifically described by them as being a lubricant suitable for
wiping contacts, as well as multiple other uses.
The grease we used in 1961 was probably a 'Radiospares' (now RS Components)
in-house
Lolol
73,
Gary K9GS
Original message
From: Bill Aycock billayc...@centurytel.net
Date:11/22/2013 9:41 AM (GMT-06:00)
To: Jim GM jim.gmfo...@gmail.com,topband topband@contesting.com
Subject: Re: Topband: Verifying integrity of 75 ohm coax.
Jim--
I wish you would NOT do
Silicone dielectric compound (grease) should not be used as a lubricant.
It's actually somewhat abrasive.
I think you had something else going on, Mike, or you did not use the stuff
being sold as dielectric compounds.
http://en.wikipedia.org/wiki/Silicone_grease
_
Topband
Vaseline will work keeps moisture out, non conductive. You can cover a lot
of surface. Over years it drys out gets crusty. Vaseline is made of lanolin
mostly, I believe.
Neverseizes or anitseize compound found in any hardware store, Works very
well drys out some but keeps working for years.
Tom, W8JI wrote:
Dielectric grease has been used to preserve electrical connections in low
pressure connections and high pressure connections at least since the 1960's
or early 1970's.
Possibly even earlier than that. I spent a small part of my misspent youth
(~1961) in a TV repair shop. The
GM
Sent: Friday, November 22, 2013 8:22 AM
To: topband
Subject: Re: Topband: Verifying integrity of 75 ohm coax.
Vaseline will work keeps moisture out, non conductive. You can cover a lot
of surface. Over years it drys out gets crusty. Vaseline is made of lanolin
mostly, I believe.
Neverseizes
Silicone dielectric compound (grease) should not be used as a lubricant.
It's actually somewhat abrasive.
Hoping to extend its life, I once tried that stuff on a high-quality
silver-plated rotary wafer switch on a piece of industrial machinery at the
last place I worked. The switch actually
a a natural animal based Wax. The
unnecessary broadcast of errors like this make me wonder if anything
you say
is fact-based.
Bill--W4BSG
-Original Message-
From: Jim GM
Sent: Friday, November 22, 2013 8:22 AM
To: topband
Subject: Re: Topband: Verifying integrity of 75 ohm coax
4:37 PM
To: billayc...@centurytel.net
Subject: Re: Topband: Verifying integrity of 75 ohm coax.
FYI Billthe use of medical grade petroleum jelly was recommended
in ON4UN's LBDXing book. That doesn't always make it right, but
personally,
I've been using the jelly for years to keep water out
That sounds like no-ox on DC plant connections. You'll find after years and
years that the copper will still be shiny and new looking in the
grease-protected areas. The idea is to keep out oxygen so that the connection
doesn't corrode since the corrosion is what increases the resistance.
Helpful advice, Tom. Thanks. I've always worried about using silcone
grease
on connectors. I understand it helps seal the connector, but my fear is
that
it could interfere with the electrical bond. On the face of it, getting
non-conducting grease on, e.g., the center terminal of an
or
PL259 seems like asking for trouble.
73,
Jim W8ZR
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Tom
W8JI
Sent: Tuesday, November 19, 2013 5:26 PM
To: Bill Wichers; g...@ka1j.com; Topband@contesting.com
Subject: Re: Topband: Verifying integrity
on them.
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Jim Garland
Sent: Wednesday, November 20, 2013 9:32 AM
To: 'Tom W8JI'; 'topband'
Subject: Re: Topband: Verifying integrity of 75 ohm coax.
Helpful advice, Tom. Thanks. I've always worried about using
It certainly is not asking for trouble, Jim. It is good practice, and after
using it in countless UHF, N, and F connectors for over 40 years without a
problem, I agree 1000% percent with Tom. Even though silicone dielectric
compound is non-conductive, it does NOT prevent good metal-to-metal
On Wed, Nov 20, 2013 at 9:32 AM, Jim Garland 4cx2...@miamioh.edu wrote:
I've always worried about using silcone grease
on connectors. I understand it helps seal the connector, but my fear is
that
it could interfere with the electrical bond. On the face of it, getting
non-conducting grease
Hi Jim and All,
I had been working in Medical Electronics 25+ years... Now retired for over 20
years.
Silicone Grease was and is still used on all high voltage connections to the
X-Ray tube. The cathode lead
had the high voltage and the filament voltage. It never changed any of the
filament
Just a suggestion: the TB Snap'n'seal connectors also have Seal nuts which
can be bought separately. They're intended to seal out water from the thread
area on the F connector. They are basically a metal shell with some threads
that captivates an O-ring such that tightening them against the
Just a suggestion: the TB Snap'n'seal connectors also have Seal nuts
which can be bought separately. They're intended to seal out water from
the thread area on the F connector. They are basically a metal shell with
some threads that captivates an O-ring such that tightening them against
the
Gary,
A good reminder for me as I plan to walk my beverages today checking for
problems. I'll take along my F connector wrench and make sure all are
tight.
73,
On Mon, Nov 18, 2013 at 2:00 AM, Gary Smith g...@ka1j.com wrote:
Gentleman, and I say that honestly... :)
I have a resolution to
I just downloaded the manual on PDF and read the advanced section
dealing with distance to fault. Sorry to say I must not be as sharp
as I used to be and I can't tell from what I've read if the RG6U
needs a termination for this distance to fault test or if the coax is
unterminated. Since it's the
Gentleman, and I say that honestly... :)
I have a resolution to the issue and along with it my thanks for
those who offered really solid ideas to track down. more to the
opportunity to learn, I have much apparently to learn about my 259B
which is more than just a pretty face.
However, the
I need to isolate if a problem I am having is in a faulty 75 ohm coax
(Remee RG6U flooded variety) where either a critter bit into the coax
or a Snap--Seal 6QS connector failed, or an electronics issue is the
culprit.
What's my most expeditious way to prove if it is or is not the Coax?
MFJ
Tom all those that replied,
Thanks for the replies. I do have a 259B I bought off of fleabay
several years ago no manual came with it. I only wanted it for SWR
readings to adjust my vertical wires since opening the box.
I just downloaded the manual on PDF and read the advanced section
What is making you believe you have a faulty 75 ohm coax?
I would hang a 50 ohm dummy load on it at the end of the cable that goes to
the antenna and load it to the same power level you have the problem with.
Then move the dummy load to the next joint then the next joint and so on
and do the
I'm trying to eliminate issues with my Rx array and I'm getting
birdies that are not heard on the main antenna. If the problem is
faulty coax/connectors due to bad work on my end or the help of tree
rats that didn't run at the smell of coyote urine then I have my
answer. If all is well on my
I need to isolate if a problem I am having is in a faulty 75 ohm coax
(Remee RG6U flooded variety) where either a critter bit into the coax
or a Snap--Seal 6QS connector failed, or an electronics issue is the
culprit.
What's my most expeditious way to prove if it is or is not the Coax?
I'm
On 11/15/2013 8:58 PM, Gary Smith wrote:
What's my most expeditious way to prove if it is or is not the Coax?
I'm going to hand feel all the coax tomorrow see if there's any
rodent ugly on it. If there's no bites, I'm not sure how to best test
that for a defective braid issue.
What test
Hi Gary,
if you have not made up the Time Domain Reflectometer in the ARRL
Antenna Book, then now is a good time to do so. Disconnect the coax at
the far and and terminate it 75, and then apply the TDR test. You will
see not only whether the coax is OK, but if not OK, where the
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