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

[Bob Camp]

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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