----- Original Message ----- From: "John Miles" <[EMAIL PROTECTED]> To: "Discussion of precise time and frequency measurement" <time-nuts@febo.com> Sent: Friday, August 08, 2008 1:21 AM Subject: Re: [time-nuts] Power supply for Thunderbolt
> >> >> It would be interesting to see how the 'red panel' Thunderbolts >> (the >> packaged type that run from an included switching supply fed from >> 24 >> VDC) perform under a test regime such as that TVB used to compare >> various three rail power supplies. In 'distant past' posts, maybe >> 18 >> months back, it was suggested that this supply is a particularly >> good >> performer, but IIRC no data was supplied to support this statement. >> Anyone able to oblige? > > This (cluttered) graph is indicative of the results I've seen. The > Lucent > supply used in the older red-and-black labelled Thunderbolts was not > very > clean, and its proximity and orientation adjacent to the > Thunderbolt's PCB > didn't help. > > Red = the new ("TAPR") Thunderbolt with my old Thunderbolt's Lucent > supply > Blue = the old Thunderbolt with its Lucent supply > Orange = the new Thunderbolt with the supply Tom chose > Purple = the old Thunderbolt with Tom's supply > > The reference for the red trace was somewhat noisier below 100 Hz > than the > one used for the others. You should assume that the red trace > coincides > with the orange one below 100 Hz. > > -- john, KE5FX Tnx John-looks like the included power supply was not a great performer in this regard. DaveB, NZ _______________________________________________ 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.