Could a microwave oven affect satellite radio signals?

If this isn't the group to deal with this question, then accept the
usual grovelling apologies, and point me off in the right direction.

Three weeks ago, I set up the necessary equipment  to pick up 
XM Radio's output from their satellite.
The decoder or whatever it is, on the end of the antennae cable,
faces south east and reception is good.
The screen on the receiver indicates I'm picking up both the
satellite as well as a nearby feeder on the ground.
The receiver faces due went, and is linked to my FM/AM radio so the
sound comes from its speakers.

The microwave is about 25/30  feet from it, and 
 the front facing east.  
Oven and receiver are on different electric power circuits.
The interior walls in this house are just timber frames with sheet rock
(plasterboard) cladding pinned to them.   

Don't know if it's relevant, but this microwave is not the ordinary
kind: like my computer and my watch, it has a   voice! It echoes keypresses, speaks 
times and
settings, etc.

Now the problem: the sound from the radio's speakers blinks on and
off, or goes off completely for as long as the microwave in the
kitchen is operating.  Even more  
mysteriously, this doesn't happen every time the oven is being used,
 which makes methodical experimenting and monitoring difficult.

I know little about digital radio signals, but I believe a microwave
oven generates something similar to radar  
equipment, that is, on a similar wavelength?  

Anyone know if this could possibly interfere with a digital radio
signal, or if the oven's wavelength is similar to that of the remote
control  for the receiver.  
Thanks,
-- 
Ian                                                           Ft Worth, TX, USA
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