Hi Ryan,
For the few years I've been on time-nuts, I understood the consensus view to be to get a good
quality RG-6QS satellite cable. A few of the posts in this thread have made me wonder if the
consensus is changing, or if it's just too much trouble to stand up to the crowd. I've got about
300 ft of CerroWire RG-6QS leftover from Home Depot in the garage. I looked at the datasheet, and
it's confusing. For the attenuation at 1000MHz, they list 21.45DB per hundred with the superscript
"1". However there is nothing on the page noting whether that "1" means per
100 feet or per 100 meters. Looking at the competition it would appear that that's per meter.
Unfortunately, I don't have the right connectors to hook it up to my SA to see. OTOH, 100 ft runs
from this spool don't show any noticeable (i.e. problematic) attenuation of the signal. Maybe
someone else with a spool of RG-6 in the garage could give use some real world attenuation figures
at L1?
But, rather than over-engineering or over-angsting this issue, it's probably OK
to just pick one and use it. It's not likely to make any real difference
unless you have a run in the many hundreds of feet.
Bob - AE6RV
--------------------------------------------
On Fri, 4/22/16, Ryan Stasel <rsta...@uoregon.edu> wrote:
Subject: Re: [time-nuts] RG6 or LMR400 for GPS Antenna (Symmetricom 58532A
and T-bolt)
To: "Discussion of precise time and frequency measurement"
<time-nuts@febo.com>
Date: Friday, April 22, 2016, 4:09 PM
Paul,
LOL! So, along those lines…
one other question, since I can’t find my belden, I’ll
be buying some coax. Anyone have any opinions about RG6 for
CCTV vs CATV? My understanding is the CCTV version always
has a solid copper center conductor (which in my mind would
mean less voltage loss for the DC power going to the
antenna), or I’m still overthinking it and should just go
with standard RG6?
Thanks!
-Ryan Stasel
> On Apr 21, 2016, at 13:04
, paul swed <paulsw...@gmail.com>
wrote:
>
> Ryan a
slight heads up.
> Time Nuts is not about
time accuracy as many people assume.
>
Its actually about the time we all waste looking for what we
know we have.
> We just measure that time
accurately.
> I do not use anti seize.
Nothing against it just one more glob of stuff to
> deal with.
> If you use
the heat shrink and it seals your done for my 2 cents.
> Paul
> WB8TSL
>
> On Thu, Apr 21, 2016
at 1:07 PM, Ryan Stasel <rsta...@uoregon.edu>
wrote:
>
>>
All,
>>
>>
Really awesome answers, thanks!
>>
>> For the sealing question, it was more
of a “should I bother with something
>> like anti-seize” or the like on the
actual thread-thread N interface. The
>> actual connector crimp, was planning
on just using a couple layers of the
>> heat-shrink with adhesive. That is all
going to be internal to the mast
>>
anyway, so direct weather contact should be minimal. It’s
also on the side
>> of my chimney,
that gets very little to no direct sun, so UV exposure
>> should be minimal. But good note on
that regard.
>>
>> Pete, thank you very much for the info
wrt the antenna and amp, and also
>>
the fact the Trimble starter kit came with RG6. I’m going
to see what my
>> seller wants for
LMR400, but otherwise, I’ll just use RG6. It’s
certainly
>> easier to handle. I did
find some datasheets on the stuff that Home despot
>> (har har) sells (Southwire (
>>
http://www.southwire.com/ProductCatalog/XTEInterfaceServlet?contentKey=prodcatsheetOEM80)).
>> I swear I have a box of Belden
somewhere, but I can’t seem to find it.
>>
>> Thanks
again!
>>
>>
-Ryan Stasel
>>
>>> On Apr 21, 2016, at 06:02 , paul
swed <paulsw...@gmail.com>
wrote:
>>>
>>> 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 <rsta...@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 <kb...@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 <rsta...@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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>>>>>
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