Re: [amsat-bb] Exciting Coax

23 Jan 2018

      You know how the phone company used to keep paper-insulate thousand (or
whatever) conductor, lead sheath cables dry inside?  Dry nitrogen pumped in
from the central office, and extra bottles soldered in when leaks were
found :-)
On Tue, Jan 23, 2018 at 4:35 PM, Bob- W7LRD w7lrd@comcast.net wrote:
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Some years ago I had some 9913, well sealed (so I thought).  Gradually the
swr crept up.  Without a thought, it got trashed and was replaced with LMR
400.  Yes the idea of syringing water out of 9913 can work, also a constant
blower blowing into the 9913 can work, we can also insert small sponges
into the 9913 and replace them when necessary, or we can have the 9913
running down hill the whole way so the water can drip out (makes for a wet
ham shack), or we can build a roof over the 9913 to keep it out of the
moisture.  I could go on and on and I am sure many of you have even  more
creative ideas!  Am I being facetious?  Of course I am!  Hams can be
"cheap" bunch but there is place where a few extra bucks is money well
spent.  Anything above 70cm I use LMR600.  Just having fun today!
73 Bob W7LRD
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On January 23, 2018 at 1:03 PM Greg D wrote:
Yes, but wet 9913 has a loss of ?

While searching for some hardline to replace my 9913 run some years

ago,
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I resorted to drilling a hole in the bottom end of the cable, and
sucking out the water periodically with a syringe. It was not an
insignificant amount, and made a huge difference. Eventually found
someone with some leftover LDF4-50A hardline, and made a swap with

him
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for a UHF beam antenna I had extra. Best deal on the planet.

If you can truly keep your 9913 dry inside, by all means, go for it.
But how do you know it's still dry? To me, it's not worth the

trouble.
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If you like that size cable, I'd go with LMR-400 instead of either
variety of 9913.

Greg KO6TH

Glenn Miller - AA5PK wrote:

    > > 9913F7 has nearly 10 dB attenuation/100 feet at 400 MHz.

9913 has
...
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    about 2.6 dB.

    https://edesk.belden.com/products/techdata/metric/pdf/

9913F7.pdf
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    https://catalog.belden.com/techdata/EN/9913_techdata.pdf

    I know which I'd choose.

    -----Original Message----- From: Norm n3ykf Sent: Tuesday,

January 23,
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    2018 1:09 PM To: Greg D Cc: <, amsat-bb@amsat.org mailto:

amsat-bb@amsat.org >, ;
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    anderson58625 Subject: Re: [amsat-bb] Exciting Coax
    9913 is not 9913F7

    Google is your friend, or perhaps if one is lazy, not.

    Norm n3ykf

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Re: [amsat-bb] Exciting Coax

Burns Fisher