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

Bob Camp lists at rtty.us
Sun Jun 16 19:35:49 EDT 2013


Hi

Next in on the same line … MSA or MAS?

I assume it's:

http://www.mas-oy.com/products/radio-controlled-clock-rcc/mas6180/

Which would make it a MAS 6180 or it's dual band relative the MAS6181 

Bob


On Jun 16, 2013, at 6:39 PM, paul swed <paulswedb at gmail.com> wrote:

> 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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