How can one create a dangerous heat transmitting device using a
satellite dish and a microwave oven?

Hmmmmmm

What are you planning to do now?

When commenters turn mean...... ;-)

Get to grips with Maxwell?s field equations first. Match the feeder
impedance to the dish aperture. Not difficult, but not enough power to
do instant damage. Bit like all those daft Ronnie Raygun (and Edward
Teller) star wars notions. ?Keep your ICBM still for a few minutes
please while we shoot it down.?

Incidentally, though probably apocryphal, the military invented
microwave cooking by placing their meat pies in front of radar
antennae.

Best

Microwave oven operates at a frequency which is strongly absorbed by
water molecules. This is how it heats food, which always contains
water.
Air contains water vapor too. The density of the water vapor varies in
different climates, but it is always there.
Combination of these two facts leads to the conclusion that microwave
oven radiation is strongly absorbed by air. This means that it will
not propagate too far. If you ever succeed in making a deadly weapon
using a microwave oven as radation source, it will be very short
range.

The military did not invent microwave cooking, but a military
contractor did... Raytheon engineers were testing radar antennae when
one noticed the chocolate bar in his shirt pocket had melted.  Also,
super powerful microwave, plus parabolic reflector = detainment by
FBI...

I love the sponsered links...you want to make a deadly ray gun, and
HDTV and AWI microwaves pop up to voulenteer their products.  And if
anything goes wrong www.pcappliancerepair.com will be there to help.

-Fractl

I hope this post dosent alter the links...

Since when does the FBI have jurisdiction over deadly heat ray guns in China?

THe US military has an active development program in this area:

http://www.datafilter.com/mc/c_nyTimesPentagonUnveilsPlansForCrowdDispersalWeaponMar2001.html

Thanks bgs.

It looks like they beat me to the punch yet again. I've got to find a
way to patent these ideas retroactively.

http://www.defensetech.org/archives/001102.html

http://www.defensetech.org/archives/000697.html