[time-nuts] FASTRAX GPS

Bob Stewart bob at evoria.net
Thu Jul 3 00:42:59 EDT 2014


I'm a rather junior member of the list, but I wouldn't try to move 1PPS over that kind of distance; especially when it's so easy to put the receiver right next to what needs the 1PPS.  The pros are too small and the cons are too great.  There are a couple of vendors on ebay who sell "F" to "SMA" adapters.  But, a warning: from experience I have found that the RG6 is stiff and the SMA male adapter is fragile.  While moving your unit around, it's all to easy to snap the adapter off your unit.  It's a few more bucks, but consider getting a short "F" female to "SMA" male pigtail instead of just a machined adapter.  I assume that it's not a problem on the antenna end, since you're not connecting to a bulkhead connector.

In my house, I put the antenna in the attic, and snaked the RG6 through the same opening that the DirecTV cable came through.  I changed the wall plate to add another F connector.  From there is a short run of RG6 to my splitter, and then a few feet of RG316 to my receiver.


 From: jim s <jwsmail at jwsss.com>
To: Discussion of precise time and frequency measurement <time-nuts at febo.com> 
Sent: Wednesday, July 2, 2014 12:17 AM
Subject: Re: [time-nuts] FASTRAX GPS

I was being a bit lazy.  The 15' distance gets from a couple of spots in 
the room with my systems and lab, and also is already terminated, and 
there is no issue with the power since it would be totally contained in 
the unit.

But your suggestion and some work making the cables would work best.

To you and Hal who suggested it, is this unit suitable for outputing a 
1pps timing signal?  Wouldn't the long serial option Hal suggestion mess 
that up, vs. using this method to put the Fastax as close as possible to 
a system which which would have the systems gpio and serial ports attached?

Thanks to you both for answering.

On 7/1/2014 9:30 PM, Bob Stewart wrote:
> Jim,
> Are you trying to find out how to hook up a receiver in your 
> office/radio room to an antenna that is some ways away?  Or are you 
> specifically trying to remotely hook up a receiver near your antenna?  
> If the former, just use RG-6, like for cable TV, with adapters on each 
> end.  RG-6 has such low loss that the impedance change is not an 
> issue.  I've got a 30+ ft run up to the attic to a cheap GPS puck 
> antenna for my setup.  Others have much longer runs and it works OK.
> Bob

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