[time-nuts] HP5090A Off Air Standard Receiver
GandalfG8 at aol.com
GandalfG8 at aol.com
Mon Jun 19 13:19:26 UTC 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
biased:-)
Regards
Nigel, GM8PZR
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