The rules apply on a per transmitter basis.
I know that some systems are able to hop around some known channels. I'm
not sure if that extends to 900mhz or not.
Marlon
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----- Original Message -----
From: "Ryan Morgan" <[EMAIL PROTECTED]>
To: <wireless@wispa.org>
Sent: Wednesday, May 02, 2007 2:19 PM
Subject: [WISPA] FCC Regulations Clarification
I have a few questions about part 15.247 ......
(i) For frequency hopping systems operating in the 902-928 MHz band: if
the
20 dB bandwidth of the hopping channel is less than 250 kHz, the system
shall use at least 50 hopping
frequencies and the average time of occupancy on any frequency shall not
be greater than 0.4 seconds
within a 20 second period; if the 20 dB bandwidth of the hopping channel
is 250 kHz or greater, the
system shall use at least 25 hopping frequencies and the average time of
occupancy on any frequency
shall not be greater than 0.4 seconds within a 10 second period. The
maximum allowed 20 dB bandwidth
of the hopping channel is 500 kHz.
For one AP using 20db bandwidth of hopping channel < 250 kHz , hopping on
at least 50 channels.
How about 20 units in the same location, all hopping on at least 50
frequencies.
The regulation mentions that the average time on any frequency shall not
be greater than 400 ms within a 20 second period.
With all those AP hopping on those 50 hopping frequencies, you would think
that the occupancy on any particular
frequency would be greater than 400 ms within a 20 second period?
If those particular units were trying to get away from interference, can
they select certain frequencies to hop around and still be within
regulations?
If somebody could clear this up for me then that would be great.
Thanks,
Ryan
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