Bruce and others, Thank you for the assistance. Seems that the TADD-1 will meet my needs, I will probably acquire one in the near future.
Steve K8JQ Bruce Griffiths wrote: > Steve wrote: > >> Thanks for the info Bruce. >> >> I'm planning to use the Trimble Thunderbolt as the 10MHz source. >> >> The phase noise characteristics of that device are on the Trimble web >> site. I'm not versed enough in the specifications to call it good, bad >> or mediocre with respect to phase noise. Thoughts? >> >> Thanks. >> >> Steve K8JQ >> >> >> > Steve > > If one compares TvB's plot of the phase noise of a Thunderbolt with John > Ackermann's plot of the phase noise of a TADD-1 at 10MHz. > Then the phase noise floor of this particular Thunderbolt is lower than > the phase noise floor of the TADD-1 at the particular gain used in > John's test. > Thus using the TADD-1 at this gain will degrade the noise floor of that > particular Thunderbolt by about 7dB. > However at 1Hz and 10Hz the phase noise of the Thunderbolt exceeds that > of the TADD-1 by 15dB or more so the phase noise of that Thunderbolt > will not be significantly degraded by the TADD-1 at those offset > frequencies. > > Distribution amplifiers with lower noise floors and equivalent or better > reverse isolation do exist but tend to be expensive. > A design employing cascaded common base stages can have a significantly > lower phase noise floor. > > Bruce > > _______________________________________________ > 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. > > -- Read The Patriot It's Right -- It's Free http://PatriotPost.US/subscribe/ Veritas vos Liberabit _______________________________________________ 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.