Hi If it’s an off the air receiver, it’s got front end filtering and all the rejection you would want to lock on to a single carrier. 200 KHz and 2 KHz fed into an XOR would give you what you likely need. A PICDiv should be able to generate both those “tones” without a lot of crazy effort. There are a lot of combinations that could be used. A bit of play time with a spread sheet is likely called for here.
If the carrier needs modulation, then that would take a bit more effort. It’s still not outside the range of what could be done with a fairly simple board. We have tossed up the names of a couple dozen candidates over the last year or so. Bob > On Jun 19, 2017, at 9:46 AM, Clint Jay <cjaysh...@gmail.com> wrote: > > 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@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/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 >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/ >> mailman/listinfo/time-nuts >> and follow the instructions there. >> > > > > -- > Clint. > > *No trees were harmed in the sending of this mail. However, a large number > of electrons were greatly inconvenienced.* > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
