[time-nuts] 4 KV Power Supply Recommendations

[Lux, Jim (337C)]

On 1/18/10 2:10 PM, "Didier Juges" <didier at cox.net> wrote:

> I could not resist, so I checked my relatively expensive Sears/Kenmore
> microwave oven.
> The results are there:
> http://www.ko4bb.com/Test_Equipment/Microwave_oven_leakage/
> 
> In one word, dismal. Almost 1W peak power leakage at 1 foot, and almost
> 100MHz occupied bandwidth.
> 
> I looked with a crystal detector driving a scope, and it is obvious the unit
> is driven from a 60Hz transformer with half wave rectification, and has no
> filtering whatsoever, like the first Microwave oven I have ever opened (a 20
> years old model long dead).
> 
>

The cost of more expensive models is in the nice trim, control features,
integrated vent hood, etc.  They all use basically the same wiring diagram:
a transformer with a lot of leakage inductance, a diode, a capacitor, and
the magnetron.  A higher power oven will have a bigger transformer and tube.

The leakage standard is 2 mW/cm^2.   A watt into your sensor indicates
either a bad seal on the oven or some other measurement error.