[time-nuts] New Thunderbolts available without a power suppy?

[Paul Christensen]

> "Ok, but not very good, see : 
> http://www.leapsecond.com/pages/tbolt/noise.htm
stanley"

Between the information contained in that link and my own observations of 
RFI when using a switch-mode power supplies (SMPS), I've begun using only 
linear power supplies for use with my GPS-DO devices.

The internal DC/DC converters in my HP 58540A and Brandywine GPS-4 were 
creating HF radio interference.  Rather than fight and try to abate the RFI, 
the DC converters were discarded and now both units are powered directly 
from a PowerOne dual linear supply (+15VDC, +5VDC).  Switching interference 
is now completely gone.

If the Thunderbolts require a triple supply, PowerOne and International 
Power both make industrial-grade, triple-output linear supplies for 
approximately USD $100.  Anyone using their GPS-DO in the presence of an HF 
receiver may want to consider this as a powering option.

Paul, W9AC