[time-nuts] Connectors

[Brooke Clarke]

Hi:

Water has a dielectric constant around 60 compared to plastic that just over 2.  So if water gets into the connection 
there's going to be problems.
It turns out that Silicon grease has a dielectric constant very close to plastic so filling an open RF connector with 
Silicon grease prior to mating them is a great way to water proof the joint.  See Weatherproofing  at 
http://www.prc68.com/I/OE254.shtml

Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html

brent evers wrote:
> BTW - 3M Scotch rubber tape is regularly used in the offshore industry to
> make waterproof connections to 6000m/10,000psi.  I use it on any/all
> outdoor signal (RF/Microwve antenna connectors, amphenol, etc) connectors
> as well.  I cover the rubber tape with a layer of electrical tape (Super
> 88), and then a layer of scotchguard over that.
>
> Scotch rubber tape comes in both a linered (23), and liner-less (130C)
> version.  I far prefer the liner-less 130c.
>
> To make sure this is time related, my two Thunderbolt antenna connectors
> are also sealed this way.
>
> Brent
>
>
>
> On Fri, Apr 12, 2013 at 11:16 AM, Rob Kimberley <robkimberley at btinternet.com
>> wrote:
>> It's a very useful material, also called "Self Amalgamating Tape".
>>
>> Been using it for years for all sorts of outside cable work.
>>
>> Rob
>>
>> -----Original Message-----
>> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
>> Behalf Of Azelio Boriani
>> Sent: 12 April 2013 14:00
>> To: Discussion of precise time and frequency measurement
>> Subject: Re: [time-nuts] Connectors
>>
>> Sorry, not neoprene but self-sealing polyisobutyl tape, very effective for
>> the outdoor antenna work**. I have recently opened a sealed connection,
>> after 10 years, and the protected connector appears as new.
>>
>> On Fri, Apr 12, 2013 at 2:38 PM, Azelio Boriani
>> <azelio.boriani at screen.it>wrote:
>>
>>> I use neoprene tape to make really water tight connections for all
>>> type of connectors.
>>>
>>>
>>> On Fri, Apr 12, 2013 at 1:27 PM, Bob Camp <lists at rtty.us> wrote:
>>>
>>>> Hi
>>>>
>>>> The fancy F connectors are indeed waterproof if:
>>>>
>>>> 1) You have the right cable
>>>> 2) The cable and connector match up
>>>> 3) The tool and the connector match up
>>>>
>>>> The auction sites are a great place to get samples of connectors and
>>>> tools that apparently work with no known cable .
>>>>
>>>> If you are not careful about the trim on the dielectric / positioning
>>>> , they can have issues above 1 or 2 GHz. Even a lot of care they
>>>> don't really do the job above 5 GHz. Exactly where they drop out
>>>> depends (of course) on your return loss expectations.
>>>>
>>>> Bob
>>>>
>>>> On Apr 11, 2013, at 4:21 PM, Gordon Batey <gpbatey at wildblue.net> wrote:
>>>>
>>>>> Greetings,
>>>>>
>>>>> I have used the longitudinal compression F connectors for some time
>>>>> now
>>>> with
>>>>> several GPS units and RG-6 cable.  They certainly appear to be
>>>> waterproof
>>>>> and quite sturdy.  Not inexpensive but very serviceable.  I found a
>>>>> kit
>>>> with
>>>>> the installation tool and connectors and separate connectors at
>>>>> LOWES
>>>> that
>>>>> does a nice job.  I also found one for BNC that use the same
>>>>> principle
>>>> but
>>>>> have not used it yet.  Gordon WA4FJC
>>>>>
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