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

[Lux, Jim]

On 7/6/21 5:14 PM, Bob kb8tq wrote:
> Hi
>
> The observer (at 41 deg 21 min N)  is *north* of where I live. I most certainly am located in an
> area that has a “blank” over the north pole.
>
> Bob

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.

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






>> On Jul 6, 2021, at 8:06 PM, Bill Beam <wbeam at gci.net> 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.
>>
>> 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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