[time-nuts] RG6 or LMR400 for GPS Antenna (Symmetricom 58532A and T-bolt)

[paul swed]

With respect to sealing. Everyone has a method.
I use what I learned in the Navy. I could see how well the connections held
up in the worst conditions sun cold heat wet humidity...
Layer of rubber tape
scotch kote
Layer of plastic tape
scotch kote
If done well the connector releases just fine even after 5 or more years. I
want to say 10. But then woodpeckers have a way of shortening the life of
connectors and coax.
The approach is really layers and the top to deteriorate over time...
But as I say everyone has their own approach.
Regards
Paul
WB8TSL

On Wed, Apr 20, 2016 at 9:03 PM, Ryan Stasel <rstasel at uoregon.edu> wrote:

> Bob/Paul,
>
> Thanks. And there's the rub... Who knows what the specs are on "generic"
> RG6 QS. I'll see what my seller wants for their LMR400, but otherwise yeah,
> RG6 is just easier. I have both compression and crimp connectors for it,
> including some RG6 N-connectors (yeah, they're probably for LMR300, but
> they work).
>
> Other question: any tips for the exterior N connection? I can
> "weatherproof" the actual cable-connector crimp, but I'm curious if anyone
> bothers to "lube" the N connector to keep moisture from otherwise seizing
> it up.
>
> Thanks!
>
> Ryan Stasel
> IT Operations Manager, SOJC
> University of Oregon
>
> Sent from my iPhone
>
> > On Apr 20, 2016, at 17:00, Bob Camp <kb8tq at n1k.org> wrote:
> >
> > Hi
> >
> > RG-6 Quad Shield should be fine as long as it’s meeting the published
> specs. The advantage of LRM-400 is that you likely *know* where it came
> from and what the specs are.
> >
> > If you decide to split the antenna between GPSDO’s, a powered splitter
> is a really good idea. Each time you split another 2 ways, you loose 3 db.
> Get at least a 4 way splitter ….
> >
> > Bob
> >
> >> On Apr 20, 2016, at 4:41 PM, Ryan Stasel <rstasel at uoregon.edu> wrote:
> >>
> >> All,
> >>
> >> I’m going to be installing a “permanent” antenna at home, and will need
> a run of about 100ft to get from my workstation, to the mast I’ll be
> mounting the antenna on (Symmetricom 58532A). I’ve seen some indication
> that both the antenna and the Trimble Thunderbolt won’t have any issues
> with running over 75ohm cable, but thought I’d ask the “experts” whether
> I’d be better off with some RG6 Quad-shield, or LMR400 (I’ve got a local
> source that doesn’t know what LMR400 is, or what it’s worth)?
> >>
> >> Obviously I’d prefer to run and crimp RG6, but if I’d be better off
> with LMR400, I’d rather run that now than go back into the crawlspace
> again. =)
> >>
> >> Also, if it helps, I’ll probably have a Symmetricom/HP 58516A at/near
> the T-bolt so I can experiment with other GPS(DO)s as well (especially one
> of the JRMiller boards I bought and built (but never finished) ages ago).
> Which brings the question, will the T-bolt provide the oomph needed to
> power that splitter and the antenna over that length of cable?
> >>
> >> Thanks!
> >>
> >> -Ryan Stasel
> >>
> >>
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