[GPS_Standard] Power supply for HP 10544A osc

[Zack Widup]

I've been using a power supply circuit with a Linear LT1070 for Isotemp 118
OCXO's, which need 24 volts for the heater. With the appropriate bypassing
of the input and output per the data sheet and application notes, I haven't
had any trouble at all with signals from the supply getting into the
oscillator.

73, Zack W9SZ

On Thu, Nov 26, 2009 at 3:44 PM, <grahamh at austin.rr.com> wrote:

> John:
>
> The +25 Volt line powers the heater and will work from about
> 18 to 25 Volts, so 24 is fine.
>
> The oscillator electronics all work from the +12 Volt line.
>
> I recommend against the switcher, since the switcher frequency
> has a tendency to show up as a sideband on the oscillator.
>
> In fact the heater inside the HP10544 is controlled by a
> switcher.  The later HP10811 replaced the switcher
> with a linear regulator to get rid of the 90 kHz spur on
> the HP10544.
>
> --- Graham / KE9H
>
> ==
>  ---- "John A. Evans - N0HJ" <jaevans at pcisys.net> wrote:
> > Greetings all and Happy Thanksgiving to those in the US.
> >
> > I'm shopping for power supplies for my GPS standard build and have the
> > HP 10544A oscillator to power.  The data I have shows that the oven
> > needs 25V but I am wondering if a 24V supply would work fine for this
> > use.  Since most supplies are rated at nominal but often put out more
> > voltage, I'm hoping that this would work for my situation.  I could
> > always crank out my own linear supply, but a lighter, cheaper switcher
> > might be an easier sub.
> >
> > Thanks,
> > John
> >
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