[time-nuts] Microwave oven experiments

[J. Forster]

OK. Your unit still seems to put out a lot of RF.

I set my scope to sweep at something like 5 sec/div turned on the oven,
and manually tuned the wave meter across the band. The result as I
remember (it was 20 odd years ago) I got a roughly 1/2 sine looking
spectrum, the result of some thousands of cycles.

-John

==========




> I ran the oven for 2 minutes while heating up a cup of water (normally
> just fine for a large cup of tea :). The spectrum analyzer was on max-hold
> mode at the maximum RBW (1MHz) so that was a lot of sweeps, but the
> display was pretty much stable after about 30 seconds, after that, it just
> filled some of the valleys.
>
> I do not pretend that any of that is calibrated in any way, but initially,
> I thought, with the 30dB attenuation in front of the mixer, I am unlikely
> to blow anything. I guess I was right, but not by much...
>
> Certainly, the antenna is questionable, and so is the BNC T adapter.
> Antenna orientation was what it was, just moving my hand in the vicinity
> caused significant shift in the amplitude response over frequency, but not
> so much change in the peak value, so I did not try to optimize it.
>
> Didier
>
>
>> -----Original Message-----
>> From: time-nuts-bounces at febo.com
>> [mailto:time-nuts-bounces at febo.com] On Behalf Of J. Forster
>> Sent: Monday, January 18, 2010 7:31 PM
>> To: Discussion of precise time and frequency measurement
>> Subject: Re: [time-nuts] 4 KV Power Supply Recommendations
>>
>> I'm not really confident about your display, because the
>> source is sweeping very quickly. It's probably shifting 25 to
>> 50 MHz in 1/240th second. (The frequency sweep one way and
>> back in 1/120th second).
>>
>> When I was playing w/ MOs, I used a standard gain horn,
>> cavity wave meter, crystal detector, and scope.
>>
>> You may be getting something like aliasing between the scope
>> sweep and the maggie sweep.
>>
>> -John
>>
>
>
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