HAHA !!!! at first i am thinking "Hair????" what the heck is he talking about!??!!??! then it hit home!
duracells are a good idea, we should request a "AA" option on the soon to be released flex radio HT. HAHA, still chuckling!!! regards, phil AB2JL ----- Original Message ----- From: "Philip M. Lanese" <[EMAIL PROTECTED]> To: "philip gentile" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>; <[email protected]> Sent: Tuesday, August 15, 2006 11:57 AM Subject: Re: [Flexradio] Spurs and Picket Fences > Phil > > Try designing a pico Amp reading Electrometer and see how much hair PS > noise > eliminates! > > I "put my trust in Duracell" hi hi. > > Phil, K3IB > > ----- Original Message ----- > From: "philip gentile" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]>; <[email protected]> > Sent: Tuesday, August 15, 2006 10:33 AM > Subject: Re: [Flexradio] Spurs and Picket Fences > > >> i'm just guessing here, but could all these spurs and fences and such be >> caused by power supply noise from the external switching or ripple from >> linear power supplies? >> >> if the PSSR of the linear stuff is low enough or the noise high enough, >> it >> falls within the signal dynamic range and power supply noise becomes >> signal. >> >> a lot of switchers develop a real nice wideband sinX/X noise power >> distribution above the fundamental. if the noise or ripple is within the >> passband of the dsp stuff it can be hard to filter out. >> >> in my experience of running analog into high speed analog processing >> hardware is generally met with disaster after the A to D converters >> unless i >> have extremely clean supplies from DC to well past the PS switching and >> signal frequencies on the analog side. switching power supplies tend to >> send >> noise straight through the whole circuit. >> >> just my 2 cents! >> >> phil AB2JL > > > _______________________________________________ FlexRadio mailing list [email protected] http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
