The two-way radio (LMR/PMR) industry has always had very demanding requirements for RX adjacent channel rejection specifications. The limiting case for adj-ch rejection often comes down to the PN of the RX LO and the PN of a transmitter in the adj-ch.
Some vendors sold sig gens targeted and built for this market and the required performance. -Brian, WA1ZMS > On Jan 1, 2019, at 6:29 PM, Brooke Clarke <[email protected]> wrote: > > Hi Mark: > > It's not clear to me why pager testing requires such good phase noise. I > wonder if some of the amateur modes also have that need? > Maybe WSPR? > https://prc68.com/I/DRM.shtml#WSPR > > -- > Have Fun, > > Brooke Clarke, N6GCE > https://www.PRC68.com > http://www.end2partygovernment.com/2012Issues.html > axioms: > 1. The extent to which you can fix or improve something will be limited by > how well you understand how it works. > 2. Everybody, with no exceptions, holds false beliefs. > > -------- Original Message -------- >> I have done a study of how good it needs to be on my website: >> >> https://sites.google.com/site/markstcxomeasurements/ >> >> Regards, >> >> Mark >> >> >> On Tue, Jan 1, 2019 at 2:34 PM Artek Manuals <[email protected]> >> wrote: >> >>> The question that remains begging here from the original post (maybe off >>> topic ?) is how low a phase noise does he really NEED in this >>> application? We here at time-nuts tend to think in the 10e-12 minutia >>> area, but In this application ( a HF Communications receiver) the 3325B >>> may be "good enough" that PN wont really be an issue as a practical >>> matter. Don't see who the original poster is from this snippet but a >>> possible better place to get a "practical" answer might be over on the >>> EEVBlog? >>> >>> Dave >>> [email protected] >>> >>> >>>> On 1/1/2019 3:38 PM, Brooke Clarke wrote: >>>> Hi Chris: >>>> >>>> The HP 8648 Signal Generator was developed to have low phase noise >>>> that was needed for testing pagers. >>>> See second table of SSB Phase Noise at: >>>> https://prc68.com/I/HP8648.shtml >>>> >>>> -- >>>> Have Fun, >>>> >>>> Brooke Clarke >>>> https://www.PRC68.com >>>> http://www.end2partygovernment.com/2012Issues.html >>>> axioms: >>>> 1. The extent to which you can fix or improve something will be >>>> limited by how well you understand how it works. >>>> 2. Everybody, with no exceptions, holds false beliefs. >>>> >>>> -------- Original Message -------- >>>>> 01/01/2019 14:22 >>>>> >>>>> Could I use my HP3325B locked to a Trimble Thunderbolt GPS disciplined >>>>> 10MHz oscillator as the master LO of my Kenwood TS-590S transceiver >>>>> that has a LO at 15.6 MHz, or is the phase noise too great? My VK3HZ >>>>> gps disciplened LO replacement died recently, I may be able to repair >>>>> it but as they are noHi Mark: > > It's not clear to me why pager testing requires such good phase noise. I > wonder if some of the amateur modes also have that need? > Maybe WSPR? > https://prc68.com/I/DRM.shtml#WSPR > > -- > Have Fun, > > Brooke Clarke, N6GCE > https://www.PRC68.com > http://www.end2partygovernment.com/2012Issues.html > axioms: > 1. The extent to which you can fix or improve something will be limited by > how well you understand how it works. > 2. Everybody, with no exceptions, holds false beliefs. > > -------- Original Message -------- >> I have done a study of how good it needs to be on my website: >> >> https://sites.google.com/site/markstcxomeasurements/ >> >> Regards, >> >> Mark >> >> >> On Tue, Jan 1, 2019 at 2:34 PM Artek Manuals <[email protected]> >> wrote: >> >>> The question that remains begging here from the original post (maybe off >>> topic ?) is how low a phase noise does he really NEED in this >>> application? We here at time-nuts tend to think in the 10e-12 minutia >>> area, but In this application ( a HF Communications receiver) the 3325B >>> may be "good enough" that PN wont really be an issue as a practical >>> matter. Don't see who the original poster is from this snippet but a >>> possible better place to get a "practical" answer might be over on the >>> EEVBlog? >>> >>> Dave >>> [email protected] >>> >>> >>>> On 1/1/2019 3:38 PM, Brooke Clarke wrote: >>>> Hi Chris: >>>> >>>> The HP 8648 Signal Generator was developed to have low phase noise >>>> that was needed for testing pagers. >>>> See second table of SSB Phase Noise at: >>>> https://prc68.com/I/HP8648.shtml >>>> >>>> -- >>>> Have Fun, >>>> >>>> Brooke Clarke >>>> https://www.PRC68.com >>>> http://www.end2partygovernment.com/2012Issues.html >>>> axioms: >>>> 1. The extent to which you can fix or improve something will be >>>> limited by how well you understand how it works. >>>> 2. Everybody, with no exceptions, holds false beliefs. >>>> >>>> -------- Original Message -------- >>>>> 01/01/2019 14:22 >>>>> >>>>> Could I use my HP3325B locked to a Trimble Thunderbolt GPS disciplined >>>>> 10MHz oscillator as the master LO of my Kenwood TS-590S transceiver >>>>> that has a LO at 15.6 MHz, or is the phase noise too great? My VK3HZ >>>>> gps disciplened LO replacement died recently, I may be able to repair >>>>> it but as they are no longer available I am looking at alternatives to >>>>> achieve a very stable frequency. Thanks >>>>> >>>>> https://www.febo.com/pages/hp3325b/ >>>>> >>>>> http://www.vk3hz.net/XRef/XRef_Home.html >>>>> >>> -- >>> Dave >>> [email protected] >>> www.ArtekManuals.com >>> >>> >>> --- >>> This email has been checked for viruses by Avast antivirus software. >>> https://www.avast.com/antivirus >>> >>> >>> _______________________________________________ >>> time-nuts mailing list -- [email protected] >>> To unsubscribe, go to >>> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >>> and follow the instructions there. >>> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >> and follow the instructions there. >> > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
