[SixClub] Recommended Coax?

[KB0NLY]

If you had water running out of the rig then obviously you forgot the rule 
of using a drip loop in your feedlines as well...

If lightning hit the tower and blew off the waterproofing you must not have 
used the right products... I have seen antennas melted and blown apart and 
the waterproofing on the coax connector is still fine.

73,

Scott



--------------------------------------------------
From: "Roger (K8RI)" <50MHz at rogerhalstead.com>
Sent: Wednesday, June 16, 2010 1:45 PM
To: <sixclub at mailman.qth.net>
Subject: Re: [SixClub] Recommended Coax?

> When it  comes to 9913, (the quasi air core type) I threw out and gave
> away over 1500 feet of the stuff and wouldn't use it for a door stop.
> The foam filled is fine.  I used to belong to the group that said if you
> seal and water proof the connections it'll be fine. Then lightning hit
> the tower.  It removed every bit of water proofing up there.  In less
> than 15 minutes I had water running out of the 2-meter rig. The rig
> survived, the desk top did not.
>
> On 6/16/2010 2:42 PM, kd4e wrote:
>> Based on this site:
>> http://www.ocarc.ca/coax.htm
>>
>>
> I can only get part of that page to work and 9913 is not among the
> choices for the calculator.
> Typically the loss between 9913 and LMR-400 is negligible with LMR-400
> costing less.
>> Belden 9913 is a better brice-performance choice
>> than most,
> The prices must have changed as when I put in the LMR-400 it was head
> and shoulders above 9913 with about the same loss and much less expensive.
>> except for Andrews Heliax, based on
>> loss at 100' but at 150' it changes a little.
>>
>>
> Of the small cables the 1/2" Heliax has by far the least loss, but it's
> not tolerant of tight turns.  LMR-400 can make a 1.5" radius (Non
> repeatable) bend without the center connector migrating. It's also more
> rugged when it comes to getting stepped on, or run over. It's also
> easier to install on the inside of the tower without worry of kinking.
> But other than that it's the best performer of the bunch. However don't
> forget the cost of connectors. A pair of them for 1/2" Heliax will buy a
> 100' of LMR-400 plus connectors. OTOH those connectors and the cable can
> often be found as surplus or pull outs...unless I'm looking for some.
>> Variables:
>>
>> 50MHz
>> 100'
>> SWR 1:1
>>
>> ........................Loss100'..Loss150'
>> ---------------------------------------------
>> Belden 9913..............0.885....1.328
>> Davis RF Bury-Flex.......1.009....1.513
>> LMR 400..................0.865....1.297
>> Andrews LDF4-50A.........0.464....0.696
>>
>> What am I missing, please?
>>
>>
> 9913 and LMR-400 are nearly identical in loss with only 0.02 db
> difference with LMR being the better.  LMR-400 is usually cheaper than
> 9913 and far more rugged and will make tighter turns without the center
> conductor migrating.
> As I said, I'd not use the regular, quasi air core 9913 for a door
> stop.  It makes a good water pipe.
> The foam filled 9913 is a good coax, but more expensive the last time I
> priced them.
>
> 73
>
> Roger (K8RI)
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