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Re: 2.4 gHzCordless Phones
Actually the pulses were about once per second. But
the interference does have a "AC hash" character to it.
Doug
NA1DB
At 02:59 PM 1/19/01 , you wrote:
>At 11:36 AM 1/19/2001, Doug Braun NA1DB wrote:
>>running my receiver when the microwave on. I got pretty strong interference ... shows up in SSB as a pulsating noise level (probably due to the thingy in the oven that "stirs" the microwave energy). The noise blanker on my rig reduced it significantly.
>
>I think you will find that the pulses are synchronous with the AC line. One short pulse of microwave energy per AC cycle. Therefore I believe it is due to the way the magnetron is powered.
>
>I looked into this a few years back when we were designing the Globalstar downlink, which is also on 2.4 GHz. I was quite worried about interference from microwave ovens, so we characterized it, and made sure we designed a front end for the handheld phone that would be able to survive it. We succeeded, as microwave interference hasn't turned out to be a problem.
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