Henk Do any of the spurious signals show on the SA with a search antenna (located in your lab environment)connected instead of the PRS10? DaveB
----- Original Message ----- From: "Henk ten Pierick" <[EMAIL PROTECTED]> To: "Discussion of precise time and frequency measurement" <time-nuts@febo.com> Sent: Thursday, April 26, 2007 8:42 AM Subject: Re: [time-nuts] retry: PRS10 has spurious frequencies > Hi Poul-Henning, > > 1. It is not a stupid question but a very valid one. > > 2. I was aware of the EMI possibility and tried ferrites on the > supply and signal wires with no result. > > 3. I will try batteries but have to find enough of them. > > 4. On the spectrum analyzer, I checked the amplitude setting and > 10dB > change gave 10dB change of signal level. Also a mixer level change > had no influence on the spurious. > > Henk > > > On Apr 25, 2007, at 22:07, Poul-Henning Kamp wrote: > >> >> I'm going to ask a seemingly stupid question, but bear with me: >> >> Are you sure those signals are really present on the output ? >> >> The reason why I ask is that you are in a frequency territory where >> EMI is both radiated and conducted so you have to be really careful >> with your setup, grounding in particular, to make sure you do not >> actually measure the PRS10 acting as an antenna. >> >> The best way to ensure this, is to run your PRS10 off batteries, >> Sealed Lead Acid for instance, and the only other connection to >> the PRS10 should be the coax to the spectrum analyzer. >> >> Poul-Henning >> >> -- >> Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 >> [EMAIL PROTECTED] | TCP/IP since RFC 956 >> FreeBSD committer | BSD since 4.3-tahoe >> Never attribute to malice what can adequately be explained by >> incompetence. >> >> _______________________________________________ >> time-nuts mailing list >> time-nuts@febo.com >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > > _______________________________________________ > time-nuts mailing list > time-nuts@febo.com > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
