[time-nuts] Re: LH "No usable sats"

[Lux, Jim]

On 7/6/21 5:26 PM, Bob kb8tq wrote:
> Hi
>
> The location comes out in Corsica. Running a fast simulation, he’s got a hole
> from about 330 degrees over to 30 degrees AZ and from 0 to about 50 degrees
> EL.
>
> Bob


OK.. that makes sense

GPS orbit inclination is 55 degrees. If you plot the ground track, it 
just touches 55N and 55S (i.e. there are times during the orbit when the 
satellite is directly overhead the latitude = inclination), so you'd 
have to be north (or south) of 55, to have an actual hole to the north 
(all the way to the zenith).

Now, it's true that at 40N, there's not a lot of satellites to the 
north, and they'll be high elevation, all above 50 degrees is reasonable.






>> On Jul 6, 2021, at 8:12 PM, Lux, Jim <jim at luxfamily.com> wrote:
>>
>> On 7/6/21 5:06 PM, Bill Beam wrote:
>>> Bob,
>>> This is not an issue for an observer in AZ.
>>> GPS birds have orbit inclination 55-60deg and should be seen anywhere in the sky from AZ.
>>> AZ observer just needs to wait long enough for one to pass to the north.
>>
>> AZ in this case = Azimuth
>>
>> OP is in Portugal, or at least his email is..
>>
>> But, in fact, Portugal isn't that far north, I'd expect some sats to the north (at high elevation)
>>
>>
>>
>>
>>> On Tue, 6 Jul 2021 18:55:22 -0400, Bob kb8tq wrote:
>>>
>>>> Hi
>>>> There are no GPS sats flying over the north or south poles.
>>>> Bob
>>>>> On Jul 6, 2021, at 6:13 PM, Admin <asmagal at fc.up.pt> wrote:
>>>>>
>>>>> Testing two different Z3801A, I wonder why I cannot receive GPS birds outside AZ : 290 to 315 deg. My horizon is clear and EL and
>>> AMU filters are 10 deg and 1.0, respectively. Position: 41 21 N ; 08 23 W.
>>>>> Your info will be very much appreciated.
>>>>>
>>>>> --
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>>> Bill Beam
>>> NL7F
>>>
>>>
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