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

paul swed paulswedb at gmail.com
Wed Apr 20 22:05:02 UTC 2016


Ryan,
Several comments. LMR400 at 1500 Mhz is 5.1 db loss. RG 6 typically does
not seem to have a spec that I could see in this range. But will guess
9-10db. So at least 3 db more.
But that said RG6 has been used for Sat TV downlinks for years just fine
and I have used it for GPS just fine also. However I ran across a to good
to be true deal and did replace the link with LMR400 yes it made a
difference. Would I pay brand new price for LMR400 nope. My runs about 90'
all in.
Other consideration is ease of routing and terminating. RG6 is about as
easy as it gets. You can actually buy RG6 BNC connectors. I purchased a
number of crimp ones and they really work nicely.
Regards
Paul
WB8TSL

On Wed, 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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