[ntp:questions] Sure board not seeing sattelites.
agcarver+ntp at acarver.net
Wed Feb 22 04:09:50 UTC 2012
On 2/21/2012 15:49, unruh wrote:
> On 2012-02-21, unruh<unruh at invalid.ca> wrote:
>> I am having trouble with my Sure gps. I have the gps inside and have run
>> the antenna out to the edge of the roof ( the window looked out on a
>> bunch of trees, which seemed to block the gps a lot). The antenna sees
>> about 1.4 of the sky which should be lots to see enough sattelites to
>> get a time fix. However, I am finding that it will suddenly stop getting
>> a fix for long periods of time ( almost 15 hours now).
>> Here is an output from the unit right now.
>> which seems to say that it is seeing some of the sattelites, but not
>> getting a fix at all. The blue light is not flashing.
>> I have no idea what is happening here.
>> Any suggestions?
>> The antenna is on the edge of the flat roof. There are two large cedar
>> trees to the east about 3m away partially blocking about 1/3 of the sky.
>> If you want to see it, go to 49 15' 59.68N 123 15 06.09W. The trees The
>> building extention to the west is about 2.5m high so does not block out
>> that much of the sky. There seems to me to be no reason why the system
>> should not be seeing enough of the sky to get enough sattelites for a
>> fix. Defective unit?
> And suddenly after about 18 hours of not working, it works again Here is
> a working report
You might be suffering from multipath. I had a similar problem when I
first moved into this place. I had the antenna on a post but, without
thinking, I put it near a satellite dish left behind by the previous
tenants. Before moving here it was sitting in a window and doing well.
After moving here it was doing poorly, barely ever receiving signals
even though I had an even larger view of the sky. Signal levels, when
they could be measured, were in the low 20-30 db-Hz. On a whim I moved
the antenna about 3 meters further away from the original location and
signal levels jumped to 40-50 db-Hz.
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