[time-nuts] ELEMEK LXK WWVB Receiver

[paul swed]

Sun of  gun what a guess. If there are two 4046s then they may indeed be
running quadrature. Not bad at all. Who would have thunk it.
If you decide to tear into things, maybe some pictures would be helpful.
I have a fair eye for figuring things out. I do expect under the can to be
from 2-3 transistors and perhaps tuned coils and caps. The 237 Hz sighted
would be about right for an LC bandpass semi-loaded. There should also be
an agc circuit or not. The old Singer WWVB receivers have no agc at all. I
think they predate the am modulation.
Regards
Paul.


On Wed, Mar 12, 2014 at 10:33 AM, Tom Holmes <tholmes at woh.rr.com> wrote:

> Hi Paul...
>
> Thanks for that insight, There are 2 4046's on the board, but the guts of
> the RX are hidden inside a can. It does have a time code output which could
> be fun to play with. Am hoping to learn a bit more before I tear into it in
> earnest.
>
> Tom Holmes, N8ZM
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of paul swed
> Sent: Wednesday, March 12, 2014 9:21 AM
> To: n1hac at dartmouth.edu; Discussion of precise time and frequency
> measurement
> Subject: Re: [time-nuts] ELEMEK LXK WWVB Receiver
>
> Tom
> I may have missed your comment do you have one of these? It appears there
> is very little data on them. Must not have been popular.
> So from the posts I can give you a good guess. It would be a TRF receiver
> without a crystal filter. This can be as reasonable as 4 transistor stages
> to get that 100 DB gain. Further guessing. The PLL is based on 20 Khz phase
> comp of a 100KHz ref/5. Could have been a cd4046 they were around back
> then. I would truly be amazed if it actually used a set of mc1496 mixers
> and quadrature decoding.
> The new wwvb modulation will not allow the phase lock to lock. But the time
> data may still be available if they were using simple AM demodulation with
> a diode.
> Thats my purest of speculation.
> Regards
> Paul
> WB8TSL
>
>
> On Tue, Mar 11, 2014 at 2:12 PM, David McGaw <n1hac at dartmouth.edu> wrote:
>
> > From an ad in Radio-Electronics June 1980, it mentions that it
> phase-locks
> > to the carrier.  I expect the new format of WWVB will give it fits.
> >
> > https://archive.org/stream/radio_electronics_1980-06/
> > Radio_Electronics_June_1980#page/n71/mode/2up/search/wwvb
> >
> > 73,
> >
> > David N1HAC
> >
> >
> > On 3/11/14 1:55 PM, Tom Holmes wrote:
> >
> >> Does anyone have any information on this box?
> >>
> >>
> >> It has 60 kHz and 100 kHz outputs, runs on 12 VDC. Not much info found
> on
> >> the web so far.
> >>
> >>
> >> Tom Holmes, N8ZM
> >>
> >>
> >> _______________________________________________
> >> time-nuts mailing list -- time-nuts at 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 at 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 at 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 at febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>