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

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.*

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 <cjaysharp@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.