I concur with Ian. I have used FSJ4 on my 902/1296 Loop Yagi array and
never had water issues. But on more that one occasion I had the outer rings
on the jacket crack and open up. I was never sure of the mechanism (maybe
excessive flexing in the winds) but it happened several times in sections
that were not dressed tightly. I was grateful the power amp trips out when
the SWR jumps. But never water...
73 Mike K9MK
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of Ian
White
Sent: Saturday, January 16, 2016 10:43 AM
To: 'Jim Thomson'
Cc: towertalk@contesting.com
Subject: Re: [TowerTalk] Andrew FSJ4-50 issues
It's quite possible that only the outer jacket has been damaged, somewhere
up the tower, but not the solid copper shield. This would allow water to run
down between the jacket and the shield, ending up inside the connector, but
the main length of cable coming down the tower may still be electrically OK.
A quick-and-dirty fix to allow the water to drain away is to cut away a few
inches of the jacket near the lower end of the cable (like ring-barking a
tree). At the bottom end of the cutaway section, make a new water seal by
taping the jacket tightly onto the exposed copper shield, but leave the top
end of the cutaway section free to drain. It isn't pretty but it would keep
you going until the better weather.
73 from Ian GM3SEK
>-----Original Message-----
>From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of
>Peter Voelpel
>Sent: 16 January 2016 15:39
>To: 'Jim Thomson'
>Cc: towertalk@contesting.com
>Subject: Re: [TowerTalk] Andrew FSJ4-50 issues
>
>Hi Jim,
>
>Never heard about the cable not being for outdoor use.
>It is essential to fill the body of the plugs with silicone grease to
>prevent the accumulation of condensed water.
>Connectors may not be left unprotected from the weather even for one
>day.
>I use that stuff across my rotators together with a few CF12-50 cables.
>Main feed lines are LCF78-50 or RG218.
>In total 13 such cables are turned on my 4 towers, 8x LCF12-50, 5x
FSJ4-50.
>
>73
>Peter, DJ7WW
>
>
>-----Original Message-----
>From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of
>Jim Thomson
>Sent: Samstag, 16. Januar 2016 14:57
>To: towertalk@contesting.com
>Subject: [TowerTalk] Andrew FSJ4-50 issues
>
>A buddy is having issues with his Andrew FSJ4-50 flexible coax.
It's
>being used on a rotating tower.
>He used FSJ4-50 from each yagi to the tower, then spliced ( via a
male to
>female 7-16 din) into
>more FSJ4-50 heading down the tower. At the bottom of the rotating
>tower is the remote switch box.
>On the 40m coax connector, at the remote switch box, there is water
>coming
>out of it ! The splice
>was encased in heat shrink, with the glue glop inside. Also at each
>balun.
>
>We think the cable coming down the tower is toast. Is this FSJ4-50
>intended to be used outdoors ??
>I looked at some old postings from 2006, and it appears that FSJ4-50
was
>to
>be used indoors only, for
>jumpers etc. The other postings indicated it did not have any UV
protection
>on the outer jacket.
>
>I THINK I also read somewhere a long time ago that FSJ4-50 was prone
to
>water ingress.
>
>Does anybody know the real story on this stuff ? It can be replaced
with
>the rigid andrew 1/2
>inch regular heliax. It doesn't have to flex for this
application....on a
>rotating tower. At the base
>of the tower, where the remote switch box is, there is a single,
flexible
>piece of coax, used
>for rotating the tower, like 213-U...then the 213-U is spliced into
more
>(normal rigid) 1/2 inch heliax,
>and off to the shack area.
>
>The concern here is... if FSJ4-50 is pone to water ingress, then he may
well
>be in for more problems,
>since all the coax runs down the tower are also FSJ4-50
>
>Thanks in advance.... Jim VE7RF
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