Hi Mike, as I said, current plans are for a few frequencies in the 20-50 MHz range. The current project needs 20, 22 and 42 MHz oscillators.
Best regards Frank On 9/19/10, Mike Feher <mfe...@eozinc.com> wrote: > Frank - > > Did you ever mention at what center frequency you would like to achieve the > PN at your stated offset? Regards - Mike > > Mike B. Feher, N4FS > 89 Arnold Blvd. > Howell, NJ, 07731 > 732-886-5960 > > > > -----Original Message----- > From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On > Behalf Of francesco messineo > Sent: Sunday, September 19, 2010 12:04 PM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] OT: xtal osc PN > > On 9/19/10, Magnus Danielson <mag...@rubidium.dyndns.org> wrote: >> Frank, >> >> On 09/19/2010 09:35 AM, francesco messineo wrote: >>> Hi >>> >>> On 9/19/10, Bob Camp<li...@rtty.us> wrote: >>>> Hi >>>> >>>> Is -195 dbc/Hz floor good enough or is it overkill? >>> >>> I'd say this is obviously overkill, -160 dBc/Hz could be a good >>> compromise. >>> >>>> >>>> Is -155 dbc/Hz at 100 Hz offset a requirement or is -40 dbc ok? >>> >>> -40 dBc/Hz at 100 Hz is about useless, -150 dBc/Hz at 100 Hz is again >>> a good compromise, the lower (practically) the better. >> >> Do you *really* need -150 dBc/Hz? That is a hard requirement! >> >>> It's hard to explain why to ones not familiar with weak signal >>> operation between broadcasting signals, but really the noise floor >>> raise a lot when you have some 5 or 6 broadcasts signals in 500 KHz of >>> band (all with power levels of at least 10 dB more than the levels >>> used in amateur radio, often +20 dB more) >> >> I would need some more fundamental understanding of the system and needs >> to be able to understand how you come up with the above noise level at >> 100 Hz. > > as I said, if it's not possible or not practical, of course I'll take > what I can get. The receiver will be limited by its phase noise and > not for example by its IMD3. > I think already -110 dBc/Hz at 100 Hz is better than any LO in > commercial receivers (for ham radio at least). > > Best regards > Frank > > _______________________________________________ > 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. > > > _______________________________________________ > 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. > _______________________________________________ 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.