[time-nuts] WWVB remodulator for the spectracom 8170 the schematic is to large

[paul swed]

Good catch Bob 6180.
Thanks
Paul


On Sun, Jun 16, 2013 at 6:19 PM, Bob Camp <lists at rtty.us> wrote:

> Hi
>
> MSA 6180 or MSA 8160 or ….
>
> Bob
>
> On Jun 16, 2013, at 5:43 PM, paul swed <paulswedb at gmail.com> wrote:
>
> > OK no schematic. It was 2MB. But it was a scan of my notes. Happy to post
> > to a sight or two. Can include some pictures also.
> > Operation is simple the msa 6180 receives wwvb and in my case I tap off
> of
>
> 6180
>
> > a wwvb antenna multi-coupler.
> > Output of the 8160 controls inverters that select a 60 Khz clock signal
> to
>
> 8160
>
> > select high amplitude or low amplitude for the bit.
> > The 60 Khz clock uses another 60 Khz xtal from mouser or digikey.
> > The system consistently allows the Spectracom 8170 to work. Also my fear
> of
> > delay due to this processing is unfounded.
> > Compareing the wwv audio ticks and tones to the 8170 display I can't tell
> > the difference. Good enough as they say.
> > No attempt has been made to filter or shape the cmos output. The 8170
> > filters do a fine job.
> > Use a low power regulator to drop the 8170s antenna voltage to 5 volts.
> The
> > system draws 13 ma.
> >
> > Other comments you could use a ferrite rod as the app note states. Or you
> > could feed power to the old spectracom antenna and use it. Essentially
> the
> > remodulator sits in the middle of the coax. This project assembled in a
> few
> > hours yesterday. The hardest part is soldering the pesky 16 pin soic to
> an
> > expander board.
> > The 8160 chip is available in the US through a distributor. But really
> not
>
> 8160
>
> > sure how thats going to work out.
> > Literally any wwvb clock chip should be able to do this job. But no one
> > seems to sell them any more.
> > Hopefully the schematic will get through to the Time-nuts.
> > As always no intent to kit anything.
> > Regards
> > Paul
> > WB8TSL
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