Message: 5 Date: Thu, 18 Feb 2010 17:13:55 -0500 From: "Bob Camp" <lists@cq.nu> Subject: Re: [time-nuts] Advice on 10 MHz isolation/distribution     (Clay) To: "'Discussion of precise time and frequency measurement'"     <time-nuts@febo.com> Message-ID: <13D264786A8A41E781BB4E53C1DD9A00@vectron.com> Content-Type: text/plain;    charset="iso-8859-1" >Hi > > Have you looked into any actual data on small rf transformers under > vibration at 10 MHz? Hi, No.  I have experience with low-noise designs under vibration, however.  What is the compelling reason for even considering such a device when a design is available that doesn't need it?  Sounds like risk without an upside to me. >The phase noise of your reference is going to head up by your +56 db. As >long as the transformer's impact is well below the reference, it will not >show up in the output signal. any spur larger than -130 dBc will be an issue.  It doesn't take much vibe to do that.  And the synthesizer has to operate under 10g RMS. >Noise at the load is a problem, no matter how it gets there. Transmission >may not be inside your scope -yet. It's still an issue that directly impacts >what you are trying to do. Only one device is at the end of a long cable, with reduced performance expectations.  The others are local and share a common ground. I am familiar with the various types of capacitors properties and frequencies. Clay

Hi The reason to consider transformers is that they cut out 2/3 of the parts in the circuit and significantly reduce the noise. Bob On Feb 18, 2010, at 6:33 PM, life speed wrote: > Message: 5 > Date: Thu, 18 Feb 2010 17:13:55 -0500 > From: "Bob Camp" <lists@cq.nu> > Subject: Re: [time-nuts] Advice on 10 MHz isolation/distribution > (Clay) > To: "'Discussion of precise time and frequency measurement'" > <time-nuts@febo.com> > Message-ID: <13D264786A8A41E781BB4E53C1DD9A00@vectron.com> > Content-Type: text/plain; charset="iso-8859-1" > >> Hi >> >> Have you looked into any actual data on small rf transformers under >> vibration at 10 MHz? > > Hi, > > No. I have experience with low-noise designs under vibration, however. What is the compelling reason for even considering such a device when a design is available that doesn't need it? Sounds like risk without an upside to me. > > >> The phase noise of your reference is going to head up by your +56 db. As >> long as the transformer's impact is well below the reference, it will not >> show up in the output signal. > > any spur larger than -130 dBc will be an issue. It doesn't take much vibe to do that. And the synthesizer has to operate under 10g RMS. > >> Noise at the load is a problem, no matter how it gets there. Transmission >> may not be inside your scope -yet. It's still an issue that directly impacts >> what you are trying to do. > > Only one device is at the end of a long cable, with reduced performance expectations. The others are local and share a common ground. > > I am familiar with the various types of capacitors properties and frequencies. > > Clay > > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. >