[time-nuts] Used Spectracom

paul swed paulswedb at gmail.com
Wed Jan 16 20:16:23 UTC 2013


Charles sort of depends on the signal quality.
My first approach shared used a modification to the 8163 to flip the phase.
But on the east coast things can be quite a challenge the squaring circuit
was unreliable. That was actually the earliest approach I took. Lot learned
from it.
The ad633 costas loop does look quire promising. Unfortunately the job and
travel have no respect for time-nuttery. (By the way did a mc1496 approach
to complicated but cheap)
Regards
Paul
WB8TSL

On Wed, Jan 16, 2013 at 3:11 PM, Charles P. Steinmetz <
charles_steinmetz at lavabit.com> wrote:

> Joe wrote:
>
>  If [Spectracom WWVB receivers] were dirt cheap, I'd probably pick one up.
>> If you could wire in an external standard, it would still be useful for the
>> phase comparator.
>>
>
> That's what I did with my 8163.  You need to add a Wenzel-style two-PNP
> squarer and use the squarer output to replace the internal 10 MHz VCO
> output (point "BB" on the 8163 schematic).  Removing the RF Amplifier PC
> card made plenty of room for the added board.  The existing two-PNP squarer
> on the Local input is marginal, so I modified it to conform to the one I
> added.  I disabled the VCO and the phase comparator that drives it by
> removing appropriate power supply feeds, and used the 60 kHz antenna
> connector for the 10 MHz reference input.  Extremely simple, and it works
> perfectly.
>
> Best regards,
>
> Charles
>
>
>
>
>
>
>
>
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