[time-nuts] HP 5090B

Neville Michie namichie at gmail.com
Thu Oct 14 22:52:03 UTC 2010

The HP5090A is a Droitwich receiver to get the 200kHz standard  
frequency transmission from Droitwich UK.
Some buffoon of a bureaucrat moved the transmitter to the much more  
useful frequency of 198kHz, where it is today.
I have one of these receivers and somewhere some circuit manual  
information given to me by a guy who had
modified his receiver to the new frequency including getting a new  
198 khz  rock. It has a TCXO.
The unit is interesting in that it seems to have been designed/built  
in UK and has UK flavoured design as very distinct from US design.
It is in a standard HP box. My receiver still works, it will lock on  
to the 2nd harmonic of a 100kHz signal from the divider driven by my  
cheers, Neville Michie

On 15/10/2010, at 8:10 AM, GandalfG8 at aol.com wrote:

> In a message dated 14/10/2010 20:46:15 GMT Daylight Time,
> david.partridge at perdrix.co.uk writes:
> OK, I  just got one of these as part of a lot of other test gear.
> What is it  for?  I found nothing searching the archive, and Google  
> didn't
> help much  either.  The Agilent site disclaimed all knowledge!
> I suspect it  MIGHT be an off air frequency standard as it has 1MHz  
> and
> 100kHz outputs and  an aerial input.
> Any clues - or pointers to  documentation?
> ---------------------
> Hi David
> It's a standard frequency receiver, or at least the 5090A was anyway.
> I don't know how similar they are but the 5090A was a bit of an  
> oddball, in
>  that it was an HP instrument made specifically for the UK, or UK and
> Europe, and the input frequency was specified, im the October 1965  
> manual  as....
> "200-Kc British Broadcasting Corporation Light Program Carrier" :-)
> I bought the manual some years ago, just out of curiosity,  but  
> have never
> come across one of the units.
> I'm quite jealous:-)
> I'll do a quick scan of the 5090A photo and send that to you direct  
> just to
>  confirm it's the same or similar and should be able to sort out a  
> complete
> scan  if you're not in too much of a hurry.
> regards
> Nigel
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