Re: Do these cellular amplifiers work for all cellphones?

On 2022-04-11 20:31, J. P. Gilliver (John) wrote:
> On Mon, 11 Apr 2022 at 17:06:12, Alan Browne <[email protected]>
> wrote: (my responses usually follow points raised):
>>> I doubt if anyone in the UK would be daft enough to buy one. Most 
>>> newer vehicles here have a roof antenna and the phone uses bluetooth 
>>> to bind to the car for handsfree operation using the vehicles 
>>> external antenna.
>>
>> Depends on the model options ("trim level").  Lower end optioned cars 
>> tend to not use the car's antenna.  (ie: my car).
>>
>> And a roof antenna has nothing to do with the issue of connecting to a 
>> tower that is further away in a remote area - yes it's better than the 
>> phone inside, but it's not better than these boosters.
> 
> How could new cars be sold in GB with cellular boosters as Martin Brown 
> said
> they were if those cellular boosters are illegal in GB in the first place?

I never said they were.  I was clarifying that just because a car has a 
sharkfin on it, and even with the requisite electronics and antenna, it 
does not mean the phone in the car is actually using it.


> 
>>>> I called UberSignal who said they work fantastically for all carriers.
>>>> https://www.ubersignal.com/vehicle-signal-boosters.html
>>>
>>> Well they would, wouldn't they! What they don't say is that it also 
>>> messes up phone reception for anyone else in your vicinity (and quite 
>>> likely radiates sidebands into other protected frequency bands).
>>
>> This is why the system still has to meet compliance.  US has its 
>> standard, the UK its own.  Usually manufacturers know and publish what 
>> countries they are compliant to.
> 
> If they messed up reception as much as Martin Brown said they do then how
> could they be approved by the FCC and by all the cellular companies then?

Because Martin's assumptions are likely wrong or incomplete.

Facts:
1) They work[1]

2) They are meant for areas where cell towers are sparse - so you're not 
going to be interfering - there is no one close by to interfere with. 
(Competitor antennas are probably on the same tower).  Power output from 
the device is likely controlled as commanded by the receiving tower 
(reduces saturation at the receiver).

3) They are compliant (at least in the US per FCC rules).

To be clear, Great Britain is less than 1/3 the size of Texas.

There are lots of areas in the US that have sparse, poor or no coverage 
at all.

It could be in GB that there is adequate coverage almost everywhere.

Certainly not in the US.

[1] To be sure, user expectations need to be managed, most esp. for the 
mobile case.

-- 
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  half the cabinet are not asses."
-Benjamin Disraeli