[time-nuts] WWVB remodulator for the spectracom 8170 the schematic is to large
lists at rtty.us
Sun Jun 16 19:35:49 EDT 2013
Next in on the same line … MSA or MAS?
I assume it's:
Which would make it a MAS 6180 or it's dual band relative the MAS6181
On Jun 16, 2013, at 6:39 PM, paul swed <paulswedb at gmail.com> wrote:
> Good catch Bob 6180.
> On Sun, Jun 16, 2013 at 6:19 PM, Bob Camp <lists at rtty.us> wrote:
>> MSA 6180 or MSA 8160 or ….
>> 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
>>> a wwvb antenna multi-coupler.
>>> Output of the 8160 controls inverters that select a 60 Khz clock signal
>>> 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
>>> 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.
>>> 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
>>> remodulator sits in the middle of the coax. This project assembled in a
>>> hours yesterday. The hardest part is soldering the pesky 16 pin soic to
>>> expander board.
>>> The 8160 chip is available in the US through a distributor. But really
>>> 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.
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