[time-nuts] Spectracom 8170 time clocks simple suggestion

[Bob Camp]

Hi

I believe I suggested this approach back about 6 months ago. There was a significant controversy about my use of the term "seems simple".

Bob

On Jun 15, 2013, at 9:51 AM, paul swed <paulswedb at gmail.com> wrote:

> As I have been working on the d-psk-r its always been clear to me that a
> simple non invasive approach to fix the 8170 class clocks existed. Since
> the d-psk-r has consumed far more time then I ever would have guessed, I
> would like to offer the approach up to the group. Maybe someone else has
> some time to do this and it is easy. However with easy there are trade offs
> as always.
> 
> Here is teh approach
> Using a wwvb clock chip like the MSA 8160 still obtainable (And no doubt
> others say from an atomic clock)
> Take the am time code out.
> Feed that to a NE 602, SA602 or 612 series balanced modulator there all the
> same as a AM modulator.
> The 60Khz comes from a tuning fork crystal using the SA602 built in
> oscillator.
> Attenuate the output to 100 uv or so. I don't think you really need any
> filtering.
> 
> There you go. No real magic.
> Possible downsides
> Drift as the tuning fork crystals are OK. If true use a better source
> I expect the tick to be slightly delayed by this method.
> Regards
> Paul
> WB8TSL
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