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Re: ISM interference on 2401 MHz



>the answer is  no - there is not an amateur space allocation at 3.4GHz but
>on 5.6GHz there are two:

>5650-5668 for uplinks
>5830-5850 for downlinks

This does indeed look promising. Are you sure of your 5650-5668 MHz
range for uplinks?  The ARRL's version of Part 97.209(b)(2) gives the
Earth station (uplink) range as 5650-5670 MHz.

Let's see what's nearby. The 5cm ham band runs from 5650-5925 MHz in
Region 2. The NII bands, where 802.11a (not 802.11b) operates, are:

5150-5250 (50 mW max)
5250-5350 (250 mW max)
5725-5825 (1W max, outdoor antennas)

So drawing this in ASCII, with each character representing 5 MHz, we
get:


5.6                5.7                  5.8                 5.9                 6.0
|-------------------|-------------------|-------------------|-------------------|

          |------------------------------------------------------|   5cm ham band (region 2)
          |---|                              |---|		     5cm amateur satellite
	  uplinks			     downlinks

                         |------------------|			     NII (1W, outdoor)

                                        |			     5.8 GHz ISM frequency


So the lower NII bands (those with the 50mW/250mW power limits) are
well below the ham band, while the upper NII band (the one with a 1W
limit) falls within the ham band but outside the amateur satellite
segments. That's good.

However, there are other operations in these bands, including
non-amateur spacecraft.  Does anyone know what's actually operating on
these bands?

Phil
 
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