davew wrote:
Their Cell towers can pump out some serious Wattage so the problem should/must have been much worse there.....?
and the point of that would be? Despite what people think, a mobile phone base station actually runs fairly low power as the coverage area needs to be reciprocal, transmit to receive. So when the mobile (the phone), runs a maximum of 1 Watt and that has to be received by the base station, what would be the point in a base station that can shout further than it can hear?
As I keep explaining over and over to the powers that be at work.
No, we can't just turn the power up on the Wifi units and get signal to the room next door.
Richard, I was simply referring to CDMA as opposed to TDMA (but even the latter has 'dynamic' power levels); We can get into RF technologies/Cell size (and resultant power levels) but P38-vintage Cellular effects are/were different in the US of course (and that means different interference effects too, as per the OPs concerns....).
Such esoterics apart, my actual question/point above relates to why they did not seem to have the Rcvr. issue in the US. (?)
Morat; ?? Wifi/802.11etc did/does come in different (power) levels, which are Regulated anyway.
Dave, you know that and I know that....
davew wrote:
Such esoterics apart, my actual question/point above relates to why they did not seem to have the Rcvr. issue in the US. (?)
Probably because their receivers operate on 315 MHz and not in the low power devices 433 MHz band sharing the frequency with numerous other low power devices.
Yes, that may be a part of it Richard but the 315Mhz band is pretty crowded there with all their RKE devices etc too:
There has to be something else in the US Rcvr. design that either makes it more selective or the front end is less
easy to saturate (?). P38 problems existed way before the 433Mz weather-stations etc were ubiquitous here.....
(Yes, it's academic anyway and I am sure LR won't ever tell us.....!)
EDIT: (For those actually interested, eg. not for any Wifi-wafflers...); In the US the FCC-permitted power levels for RKE are some 5dB lower for 315Mhz than 433Mhz; Initially that seems to explain the difference in P38 Rcvr. interference problems - as compared to the UK.
However in general 315Mhz RKE manufacturers thus tend to raise their Rcvr. sensitivity by 2 or 3dB to 'compensate' for this ...
Maybe LR US didn't do that though ??