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From: "Carlos E.R." <robin_listas@es.invalid>
Newsgroups: misc.phone.mobile.iphone,comp.mobile.android
Subject: Re: T-Mobile opens satellite communications to Android, iOS, AT&E &
 Verizon
Date: Tue, 11 Feb 2025 21:31:35 +0100
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On 2025-02-11 21:09, Frank Slootweg wrote:
> Carlos E.R. <robin_listas@es.invalid> wrote:
>> On 2025-02-11 19:25, micky wrote:
>>> In comp.mobile.android, on Mon, 10 Feb 2025 04:05:51 -0000 (UTC), Marion
>>> <marion@facts.com> wrote:

....

>>> If I hiked in the wilderness, or if I lived in the wilderness, this
>>> would be nice to have.  But don't you need a phone with a more powerful
>>> transmitter to get all the way up in the sky?
>>
>> Depends on how high those satellites are. They could be "just" 400 Km away.
> 
>    Indeed, with line-of-sight mobile phones can cover quite large
> distances.
> 
>    Case in point: Several years ago, we traveled in a small mail plane,
> from Port Augusta to Birdsville in Australia. While there are no towers
> for about 500km of that distance, the pilot had absolutely no problem
> using his (normal) mobile phone during the flight.
> 
>    Because of the distances, Australia's main network operator (Telstra)
> uses relatively low frequencies (850 MHz for 3G and 700 MHz for 4G), but
> that's not the only explanation of this wide in-the-air coverage.
> 
>    OTOH, I assume that the transmitters in satellites have much less
> power than towers on the earth surface, so I don't know what distances
> would be achievable for (normal) phone to satellite communication.

I have seen towers inside, although two decades ago, and the backup 
batteries were just 4 lead-acid batteries of maybe a third of the size 
my car uses. Sorry, I do not remember the amps. That's 48 volts 
(standard voltage in telephony) but not many amps. So, not a lot of 
power. I think I have seen some towers fed from solar panels.




-- 
Cheers, Carlos.