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 < [email protected]> 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 > > > > > > > > > ______________________________**_________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/** > mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts> > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
