[time-nuts] the care and feeding of LPRO's

Chuck Harris cfharris at erols.com
Fri Oct 7 13:01:24 EDT 2011


There are lots of ways you can unintentionally affect a device
like an LPRO.  For instance, suppose the internal power supply
dissipates a different amount of heat depending on the input
supply voltage.  This could cause the oven to momentarily shift
its internal temperature a small amount... which may show up
as a frequency shift.  Or suppose the current change due to
changing input voltage causes a magnetic disturbance that shifts
frequency?

We're time-nuts.  We are trying to get more from these devices
than the manufacturer ever intended.

-Chuck Harris

Marco IK1ODO -2 wrote:
> Eric,
>
> the power supply quality is not critical. The LPRO (like most other Rb's) has an
> internal switching power supply, so the wide tolerance in the primary power source
> voltage.
> I found other Rb's to be quite sensitive to vibrations, but when they are in a box,
> with a decent PS (I use an universal portable PC PS, the variety that may be
> programmed by means of a resistor in a plug) and an heat sink they are happy.
>
> Marco IK1ODO
>
>
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