Hi My guess is that your VHF antenna is far from perfect at 2.4 GHz. The power seen by the antenna *should* be significantly less than the oven is actually leaking. The same could be said about the connectors and cable used (loss at 2.4 GHz). Assuming there's not a gotcha in the setup or calibration of the spectrum analyzer, that microwave is putting WAY more than it should.
Bob On Jan 18, 2010, at 5:10 PM, Didier Juges 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). > > Didier KO4BB > > >> -----Original Message----- >> From: time-nuts-boun...@febo.com >> [mailto:time-nuts-boun...@febo.com] On Behalf Of Chuck Harris >> Sent: Monday, January 18, 2010 8:28 AM >> To: Discussion of precise time and frequency measurement >> Subject: Re: [time-nuts] 4 KV Power Supply Recommendations >> >> As I understand it, the supplies are 100KHz, and have no >> significant filtering at HV. They modulate the magnetron >> with the 100KHz PWM mess. As long as the signal doesn't >> leave the rather wide ISM band, they are under no obligation >> to filter anything.... routers, etc. are squatters on the IMS >> band, after all. >> >> I am sure that some brands are better than others, but then >> some brands are only $50. >> >> I don't have any of the new ovens as yet... My old beaters >> from the early '90s are still running strong. I have no >> neighbors, so their choices are not an issue. >> >> -Chuck Harris >> > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
