[time-nuts] Practical considerations making a lab standard with an LTE lite

Jim Sanford wb4gcs at wb4gcs.org
Mon Nov 24 21:39:01 EST 2014


I'm seeing C/No numbers between 50.0 and 41.0 for the "green" birds.  
I'm seeing 27.0 to 42 on the "blue" birds.  Not quite sure what the 
difference between green and blue is.  UBlox is acting kind of funny -- 
it ignores any attempt to click on an icon or any of the menu bar 
items.  Yet it lets me move the various windows around and resize them.  
A challenge for another day.  (Winders7)

HDOP is 1.0, which wikipedia tells me is "ideal".  PDOP is 1.9, still 
good, but far from ideal.  Reported position is very stable, converting 
altitude (meters) to feet gets me 1158 feet, about 120 feet lower than 
what the GPS in the car says my antenna should be at.  (1250' at the 
drive way, plus 20 feet of pole supporting the antenna.)


On 11/24/2014 8:27 PM, Said Jackson wrote:
> Jim,
> Bobs suggestion is good; look at for example the  LT3060 for something that needs less than 100mA.
> Glad your antenna is working well. What C/No numbers is uBlox indicating?
> Bye,
> Said
> Sent from my iPad
> On Nov 24, 2014, at 16:28, Bob Camp <kb8tq at n1k.org> wrote:
>> Hi
>> The Linear LT1764 is a pretty good part. It’s nice and rugged / tough to kill. Bypass the output with a few hundred uF of tantalum caps. Keep at least a volt between input and output.
>> Bob
>>> On Nov 24, 2014, at 7:12 PM, Jim Sanford <wb4gcs at wb4gcs.org> wrote:
>>> Said:
>>> Several times you've mentioned a low noise LDO regulator.  I've not seen a device specified -- can you share?
>>> Also, yesterday, in response to my question about using an existing antenna, you basically said, "Try it."  Well, I did -- working great for over 24 hours.  At this moment, I have good lock on 9 GPS birds and a "3d/gps" fix mode reported by U-center.  Interestingly, there are a few GPS birds that show up as blue, even though they have the same C/N ratio as some green birds.  One of them is at 89 degrees elevation -- no blockage like some to the west -- don't get that.
>>> Anyway, wanted to share that my existing antenna seems to be working fine!
>>> AND, my first 10 MHZ board arrived today . . . .
>>> Thanks,
>>> Jim
>>> wb4gcs at amsat.org
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