John, you bring up a valid concern. I am not aware of any coaxial type
connector that could be considered waterproof. The fundamental reason is
because the threaded connections do not create a hermetic seal when they are
screwed together.
There are inevitable air spaces inside the connectors and coaxial cables.
These air spaces will fill with air. When the air is heated (like outside
in full sun) it will expand, creating a positive pressure. Conversely, when
the air cools (like at night), it will create a negative pressure. This
negative pressure will suck tiny amounts of water vapor through the threads of
the connector.
If enough water vapor is present droplets of water can condense during the
cooling cycle and over the course of days and weeks can collect inside the
connector. Once inside, there is no escape and the droplets continue to
collect over time.
If there are rain or dew drops of water on the outside of the cable, they
can also leak through the threads and collect inside the connector. Gravity
is not your friend here.
Many commercial applications pressurize all of the cables even if they are
foam filled types to prevent the problem. You may have noticed many of the
Heliax type connectors have air fittings; that is why.
73,
Gerald K5GW
Over
In a message dated 9/7/2016 5:37:52 A.M. Central Daylight Time,
john@kk9a.com writes:
Is any TX connector really water proof? Are DIN's being professionally
installed with no external butyl rubber and tape? On the two outdoor DINs
that I have, I weather proofed the connection the same way I did with UHF
and N connectors.
John KK9A
To: towertalk@contesting.com
Subject: Re: [TowerTalk] LMR600 male DIN
From: "Roger (K8RI) on TT" <K8RI-on-TowerTalk@tm.net>
Date: Wed, 7 Sep 2016 01:08:48 -0400
Take care!
According to the Amphenol page N-Type are not water proof/weather proof.
73
Roger (K8RI)
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