[time-nuts] HP5090A Off Air Standard Receiver

Stephen Tompsett stephen at tompsett.net
Mon Jun 19 08:41:01 EDT 2017

How about building a frequency converter to produce 200KHz; mixing the
incoming RF (198KHz) with 2KHz derived from the output of the unit,

On 18/06/2017 21:17, GandalfG8--- via time-nuts wrote:
> Hi Pete
> That's quite good timing, if you'll pardon the expression:-), as I uploaded 
>  a pdf version of the 5090A manual to mediafire a couple of months  ago....
> http://www.mediafire.com/file/u0bf1eips89uo3h/HP_5090A_Ops_and_Service.pdf
> I know a few others have considered converting the 5090A to 198KHz but it's 
>  not straightforward and I believe the general consensus has been that it's 
> not  really worth the effort.
> I have a 5090B which I'm hoping to get up and running when it finally  
> reaches the top of the to do list and my view is that it would be much better to 
>  leave the original electronics undisturbed and to drive it with a  200 KHz 
> signal divided down from a from a GPSDO or a rubidium  module, although 
> having one of the latter already running at 800KHz  does leave me a bit 
> biased:-)
> Regards
> Nigel, GM8PZR
> Does anyone happen to have an electronic copy of the user /  technical 
> manual they would share with me?All expenses covered.
> This rather  unusual unit was produced in the UK in the days or the rather 
> sensible 200kHz  Droitwich transmissions.
> Im considering reworking the unit to the newer  198kHz standard.
> PeteG4GJL
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Stephen Tompsett

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