[Date Prev][Date Next][Thread Prev][Thread Next] - [Date Index][Thread Index][Author Index]

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.


__________________________________________________
Do You Yahoo!?
Talk to your friends online with Yahoo! Messenger.
http://im.yahoo.com

----
Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org



AMSAT Top AMSAT Home