[time-nuts] Racal 9475 Rubidium

Bob kb8tq kb8tq at n1k.org
Thu May 3 12:55:19 EDT 2018


Hi

You *really* need to keep the baseplate of the FRK series devices down. Their reliability drops quite a bit
as you go from 40 to 50 to 60 C on the baseplate. I would avoid boosting the input voltage without a very
good heatsink ( or heatsink + fan ) setup. 

I’ve …. ummm ….. cooked … a number of FRK’s over the years. 

Bob

> On May 3, 2018, at 12:40 PM, Nick Sayer via time-nuts <time-nuts at febo.com> wrote:
> 
> 
> 
>> On May 2, 2018, at 7:13 PM, Roger Tilsley <j.r.tilsley at runbox.com> wrote:
>> 
>> 
>> 
>> In my experience, FRK modules produce their best performance when operated  from a supply voltage between 27 V and 28 V, selected for individual units but 27.6 V is a good starting figure. 
> 
> Would there be any value to designing a 24 -> 27.5 volt boost converter that one could use to power it from a more conventional supply? How much current would it need?
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