[GPS_Standard] Power supply for HP 10544A osc

[John A. Evans - N0HJ]

Thanks Graham,

  Should I stay away from switchers for the standard all together or 
just for heater power to the oscillator?

tnx es 73 - john - n0hj

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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