A preselector adds dynamic range in the presence of a broadband signal. Ken Javor Phone: (256) 650-5261
From: "McDiarmid, Ralph" <[email protected]> Reply-To: "[email protected]" <[email protected]> Date: Thu, 22 Oct 2015 14:30:45 -0700 To: <[email protected]> Subject: Re: [PSES] Preselector requirement in ANSIC63.4 -low PRF I can see how adding gain ahead of the SA lowers the noise floor, but I don't see how a preselector can do same. A preselector seems most useful in tuning only the frequency band of interest, rejecting (attenuating) the rest. ____________________________________________________________________________ ___ Ralph McDiarmid | Schneider Electric | Solar Business | CANADA | Regulatory Compliance Engineering From: "Grasso, Charles" <[email protected]> To: [email protected], Date: 10/22/2015 01:32 PM Subject: Re: [PSES] Preselector requirement in ANSIC63.4 -low PRF Hey Ken thanks! The note in ANSIC63 says that the preselector is required to increase the dynamic range of the instrument. Is it simply a noise floor issue but then why the <20Hz specificity? Best Regards Charles Grasso Compliance Engineer Echostar Communications (w) 303-706-5467 (c) 303-204-2974 (t) [email protected] (e) [email protected] (e2) [email protected] From: Ken Wyatt [mailto:[email protected] <mailto:[email protected]> ] Sent: Thursday, October 22, 2015 1:23 PM To: [email protected] Subject: Re: [PSES] Preselector requirement in ANSIC63.4 -low PRF I would think that if the measurements were taken in a chamber and the product emissions were characterized and amplitudes known and the analyzer was a good quality one, justification could be made to eliminate the preselector. I suspect the requirement was established during the days we all were using OATS. Kenneth Wyatt Woodland Park, CO Sent from my iPhone. On Oct 22, 2015, at 12:58 PM, Sundstrom, Mike <[email protected] <mailto:[email protected]> > wrote: So the SA is not in overload, which could give a wrong amplitude otherwise. Thanks, Michael Sundstrom Garmin Compliance Engineer 2-2606 (913) 440-1540 KB5UKT ³Never give up on a dream just because of the time it will take to accomplish it. The time will pass anyway.² Earl Nightingale From: Grasso, Charles [mailto:[email protected] <mailto:[email protected]> ] Sent: Thursday, October 22, 2015 1:53 PM To: [email protected] <mailto:[email protected]> Subject: [PSES] Preselector requirement in ANSIC63.4 -low PRF Hell all, ANSI C63 *requires* the use of a preselector on an SA when making QP measurements of a signal with a low repetition rate (lower than 20Hz or less). Does anyone know why? Best Regards Charles Grasso Compliance Engineer Echostar Communications (w) 303-706-5467 (c) 303-204-2974 (t) [email protected] <mailto:[email protected]> (e) [email protected] <mailto:[email protected]> (e2) [email protected] <mailto:[email protected]> - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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