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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.


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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