Double check your power strip's total rated wattage (110 volts x amps) to see
if it will handle the microwave's input power. If it is compatible, try your
EMI Power Strip directly on the microwave oven's power cord. This will
reduce interference BEFORE it has a chance to radiate from the house wiring.
You can get EMI Filters that attach directly to the wall:http://www.parts-express.com/pe/show...number=125-010http://www.parts-express.com/pe/show...number=125-006http://www.tripplite.com/en/products...xtModelID=3974http://www.tripplite.com/en/products...?txtModelID=98
An extra 6-ft of power cord not only radiates somewhat more, but also
reduces the power ratings from 1800 W to an unaccepable 1440 W:http://www.tripplite.com/en/products...?txtModelID=97http://www.parts-express.com/pe/show...number=125-030
The above products all provide "40-80 dB" of EMI suppression, which
is considerably more than you'll find in most "Surge Protector Strips".
Tripplite even provides detailed specs to explain the "40-80 dB" hype:http://www.tripplite.com/shared/tech...ual/931411.pdf
A much larger power filtration system is needed to exceed these numbers.
It is ALSO possible the high electrical load of the microwave is drawing down the
AC voltage as it goes into your TV (check it with a meter). Flip power breaker
switches (or whatever) to determine whether they are on the same electrical circuit.
If they are, temporarily (or permanently?) run an extension cord from the TV (etc)
to an outlet that is NOT on the same circuit as the microwave. If this cures the
problem, you at least know what is needed to "fix" the problem.....perhaps
an UPS (Uninterruptible Power Supply) that is ALWAYS providing power from
the battery....as opposed to those that sit idle waiting for input power to fail....