[TowerTalk] LMR600 male DIN

[TexasRF at aol.com]

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 at 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 at contesting.com
Subject:    Re: [TowerTalk] LMR600 male  DIN
From:    "Roger (K8RI) on TT"  <K8RI-on-TowerTalk at 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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