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

Said Jackson saidjack at aol.com
Tue Nov 25 04:47:23 UTC 2014


Jim,

41 to 50dB is great.

The height difference may be MSL to GPS height?

Bye,
Said

Sent From iPhone

> On Nov 24, 2014, at 18:39, Jim Sanford <wb4gcs at wb4gcs.org> wrote:
> 
> Said:
> 
> 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.)
> 
> Jim
> 
>> 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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