[time-nuts] FASTTRAX GPS Antenna power

jim s jwsmail at jwsss.com
Fri Jul 11 09:53:25 EDT 2014


On 7/10/2014 10:02 PM, Bob Stewart wrote:
> I'm a bit confused about what you're asking.  You discuss antennas but you show pictures of a GPS receiver.  They're not the same thing.  I use a puck antenna.  They cost about $6 on ebay, and take their power from the coax.  Normally your GPS receiver supplies power to the coax, so you don't have to do anything special, other than don't short it out.
>
> Bob
Read the page at the bottom.  Tom showed supplying power to the GPS unit 
for Primary and Secondary power.  The Antenna power supply pin is not 
mentioned.

I have a puck antenna, which needs power, and I'm just asking if anyone 
has an opinion about whether this particular unit may supply the power 
w/o connecting pin 1.

W/o the page to reference that you would not have the thing that is 
confusing me.

So, does this unit have some option that supplies the power to the 
antenna, or do I need to run the power to the antenna thru pin 1? And 
can I hook up the same +3.3 to all three supply pins?  Or should I hook 
up a separate antenna supply, and assume the ground for that supply is 
the pin 8?

Jim
>
>
> ________________________________
>   From: jim s <jwsmail at jwsss.com>
> To: time-nuts at febo.com
> Sent: Thursday, July 10, 2014 11:49 PM
> Subject: [time-nuts] FASTTRAX GPS Antenna power
>   
>
> I disobeyed the group suggestions about antennas, and bought one of the
> one which needs power.
>
> I had asked whether I should apply 5 volts to the.
>
> tom posted on his fine info page a pinout, which I'm going to use.
>
> Pin 1 is 3-5.5VDC Antenna power input.
> Pin 2 is Prime Power input
> pin 4 is Backup Power input.
> Pin 8 is GND
>
> I am going to apply 3.3 to 1,2, and 4.  Just wanted to get an opinion
> before trying it.
>
> I'm curious if somehow the suggested Primary and Backup power was all
> that was needed, or how you guys were getting your GPS signals in.  Are
> your antennas not powered?
>
> thanks
> Jim
>
> http://leapsecond.com/pages/itrax/
>
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