Re: [TowerTalk] LMR600 male DIN

[Kevin <kstover@ac0h.net>]

I believe it all started with the superiority of heliax/hard-line from a 
loss perspective and since UHF type connectors for such cable are 
expensive and rare why not use 7/16 DIN, a commercial standard connector.

On 9/7/2016 10:26 AM, StellarCAT wrote:
> 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@aol.com
> Sent: Wednesday, September 7, 2016 8:56 AM
> To: john@kk9a.com ; towertalk@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@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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--
R. Kevin Stover
AC0H
ARRL
FISTS #11993
SKCC #215
NAQCC #3441


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