[time-nuts] Adafruit (MT3339) problems today
Chris Albertson
albertson.chris at gmail.com
Fri Apr 11 16:11:28 UTC 2014
On Thu, Apr 10, 2014 at 2:48 PM, Bob Stewart <bob at evoria.net> wrote:
> .... The only particular anomaly I can see is that it uses satellites
> close to the horizon for position fixing.I'm getting a reported SNR of 39
> at 5 degrees elevation and 37 at 3 degrees, though I notice the sat at 3
> degrees is not being used to calculate position. I never got around to
> finishing the choke ring antenna with those pie pans. Maybe that needs to
> move higher on my priority list.
>
Does the GPS' command set allow you to set a horizon mask? Some of them
have a setting where you can specify a minimum elevation angle. 10 degrees
is reasonable. So nothing within 10 deg. of the horizon is used.
I don't think WAAS is going to help with 150ft jumps. It is more for "fine
tuning"
What you really need to do is spend $20 on a timing mode GPS, even an older
Motorola Oncode has a self survey and fixed location mode. Pick a really
good spot for the antenna
--
Chris Albertson
Redondo Beach, California
More information about the Time-nuts_lists.febo.com
mailing list