[TowerTalk] LMR600 male DIN

[StellarCAT]

Forgive me - I've replied to Gerald's email but this is directed to the 
thread in general: WHY all the concern for sealed connectors and connector 
types? I've been using UHF for 49 years and the only time I've had issues 
with those installed outside it was my fault - either poor wrap of tape or 
poor solder job ... I've had cables with connectors that were out for years 
with electrical tape wrapped around them in 2 directions - years later when 
disassembling them for a move they were utterly pristine! I don't get it - 
why so much discussion?

Gary
K9RX



-----Original Message----- 
From: TexasRF at aol.com
Sent: Wednesday, September 7, 2016 8:56 AM
To: john at kk9a.com ; towertalk at contesting.com
Subject: Re: [TowerTalk] LMR600 male DIN

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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