On 12/10/2010 19:26, jim@jpes.com wrote:
>   All,
>
>   To me, this makes some sense.  A microwave oven operates at 2450
> Mhz(2.45Ghz) which puts it in band.
>   A typical microwave generates between 500 and 1k watts.  Some of this
> can leak out of the case and
>   ride on the power lines powering the oven.  The powerlines then radiate
> the energy, and cause trouble.
>   Especially if the lines run close to a LAN cable junction, switch,
> router or hub.  There are components
>   in both the microwave oven and in the switch/hub or router that
> generally take care of any RFI on the
>   power lines, but with the strength of the microwave energy to start
> with, some of it can get through by
>   brute strength (RF Field Strength).  And, the older the microwave, the
> less effective these protection
>   schemes are, if the particular oven even has them. Some of the older
> ones doon't have the protection that
>   the newer ones do.  And the older ones technology isn't as advanced as
> the more current ones.
>
>   So, taking all of this into account, it seems to reason that what is
> being seen could happen.
>   Why it happens only when there is a load though is a puzzler.  I still
> believe it has to do with modulation
>   effects.
>
>
>   Regards,
>
>   Jim
So why does it affect the 950Mhz to 2100Mhz (really actually only upto=20
2000MHz) Satellite IF? High level signal and all the IF to Baseband=20
(Zero IF I &Q)) of the Satellite receiver is in the small metal can on=20
F-Connector in "receiver" the rest of the box is PSU, DSP, Digital to=20
Analogue and GUI CPU etc.
--=20
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