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

billriches bill.riches at verizon.net
Sat Apr 23 10:26:04 EDT 2016


RG6 for CCTV has copper shield and solid conductor.
RG6 for CATV has aluminum shield and solid conductor.
 73,

Bill, WA2DVU
Cape May 

-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of Ryan Stasel
Sent: Friday, April 22, 2016 5:09 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] RG6 or LMR400 for GPS Antenna (Symmetricom 58532A and T-bolt)

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 <paulswedb at 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 <rstasel at 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 <paulswedb at 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 <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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