[time-nuts] HP5090A Off Air Standard Receiver
GandalfG8 at aol.com
GandalfG8 at aol.com
Mon Jun 19 14:13:38 UTC 2017
I'm sure there's various ways of doing it, a phase locked oscillator
perhaps, dividing 10MHz by 50, or perhaps my preferred lazy method of dividing
800KHz by 4:-)
It really doesn't really matter all that much, the initial comment was
just that it might be better to provide a 200KHz signal from an alternative
source rather than attempt to modify the 5090 to accept 198KHz and the
implementation itself should be quite straightforward.
Nigel, GM8PZR
In a message dated 19/06/2017 14:46:59 GMT Summer Time, cjaysharp at gmail.com
writes:
If it's just locking to the carrier I wonder if it'd be possible to use a
suitably modified PICDiv clocked from a 'standard' 10MHz GPS locked device
like the Lucent?
On 19 June 2017 at 14:19, GandalfG8--- via time-nuts <time-nuts at febo.com>
wrote:
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/http://www.mediafire.com/filehttp://www.medi_
(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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