[time-nuts] FASTTRAX GPS Antenna power

Tom Van Baak tvb at LeapSecond.com
Fri Jul 11 11:41:26 EDT 2014


The "primary" and "secondary" wording is for the Trimble Resolution-T. Don't confuse that with the iTrax130 board. The two are not pin-compatible, or at least I was unable to use the iTrax130 as a drop-in replacement in the fancy Trimble dev kit.

I've updated the web page showing the actual iTrax130 pins that I used in my testing. Please see the new photos at the end of:
http://leapsecond.com/pages/itrax/

You may connect any 3V GPS antenna to the SMA connector; the board provides the necessary power.

/tvb

----- Original Message ----- 
From: "jim s" <jwsmail at jwsss.com>
To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
Sent: Friday, July 11, 2014 6:53 AM
Subject: Re: [time-nuts] FASTTRAX GPS Antenna power


> 
> 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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> 
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