how to observe a wave

[CPL.Luke]

anybody know of a good way to observe a microwave at ~2.5 ghz?

 

I ask because I have to make a cavity that resonates at this frequency, but I have know way of knowing when I'm right on the money. and furthermore when I'm using the cavity I need to see any fluctuations that occur in the wave.

 

I have access to an oscilloscope if that helps any.

 

I'd be very thankful for any help

[insane_alien]

put a load of marshmallows in and your should see "hotspots" where the marshmallows melt quickly and cold spots where the marshmallows take longer

 

EDIT: Oh yeah almost forgot this, Then eat the marshmallows .

[CPL.Luke]

a way of observing the wave on an oscilloscope, as I'm building my own cavity, or more presicesly tuning a cavity precisely to the frequency of the magnetron.

 

after I've tuned the cavity properly I also need to watch for any anomalies in the waveform, so marshmellows won't work.

 

 

So far i've been thinking an antennae and possibly a transformer to up the voltage to the oscilloscope resolution levels.

[insane_alien]

well you could buy a bag of marsh mallows and eat them when your watching the ocilloscope.b

[CPL.Luke]

I need a way of observing*

 

(correction to my previous post)

 

cheers to eating the marsmallows while watching the oscilloscope

[swansont]

Oscilloscopes don't generally detect signals that high. Make sure yours does. One usually uses a network or spectrum analyzer. Scan the input frequency and measure the output — you should be able to map out the resonance. But you have to be sure your antenna does not have a resonance as well, or that you've calibrated it to account for that.

[CPL.Luke]

hmm, unfortunatly I don't have access to a frequency analyzer, do you know of a way to decrease the frequency of the wave in the circuit before it goes to the oscilloscope?

[swansont]

Use a frequency divider.