pchristy
Senior Heliman
Location: Nr London, England
| When I measured a Spektrum set, it was showing about 60mW at the terminals, which coupled with the antenna gain of 2 dB would give about 100mW erp.
To be fair, 10 or 20mW either way is not going to make a huge difference, given the path budget for these systems. But you've got me thinking about the bandwidth issue. I wonder if - like the Spektrum - they are only claiming using 10% of the available bandwidth, and using that as the reason for using 100mW?
Its all going to be academic shortly, anyway! (In Europe, at any rate!) Under the new rules currently being drafted, the only criteria will be "Does the equipment operate "politely" with other 2.4 GHz gear?" (Their terminology, not mine!) In other words, will it avoid an occupied channel? If so, 100mW will be permitted regardless of modulation technique used, if not it will be restricted to 10mW.
I know ofcom were asking for views on permitting higher power levels, but it all seems to have gone quiet on that front. I think it was aimed at bringing broadband cheaply to rural areas. At the moment, we don't need more than 100mW in Europe, but if they start blasting out watts of power from the village hall, we might need a bit more......!
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Pete |
