[time-nuts] HP5090A Off Air Standard Receiver

GandalfG8 at aol.com GandalfG8 at aol.com
Mon Jun 19 09:19:26 EDT 2017

I suppose a converter from 198KHz could be an option but I know of at  
least one other experimenter who's run into problems with the Teleswitch  
modulation on the Droitwich signal when trying something similar with a  5090A.
Although, from one point of view, running it from the present 198KHz  
signal might be considered the ultimate goal it's the operation of the  hardware 
itself that's of more interest to me in this instance, so I'm  quite happy 
just to feed it with an accurate 200KHz signal from  whatever other sources 
are available.
Nigel, GM8PZR
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 
Nigel,  GM8PZR

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