[time-nuts] Dephasing WWVB
John Reed
ka5qep at sbcglobal.net
Sat Jun 28 13:25:44 EDT 2014
Hi guys,
This is my first posting. I think I’m a Time Nut, at least my friends tell me I am. I’m trying to get my old Tracor 599J phase locking receiver working again. It used to work great, but since 2012 has not worked, as you all are probably aware. I discovered an article on the web that uses an AD835 multiplier chip to square the WWVB signal which gets rid of that added phase. I built a five section synchronous filter tuned to 60 KHz to get rid of interference and its output feeds the 835 chip. This all works fine. Now I have a 120 KHz signal that’s phase free. The problem is that the 599J won’t tune that high so I have to divide this 120 KHz frequency by 2. So far I haven’t had any luck with doing this. I’ve tried to generate a pulse train from the 120 KHz signal and then use a flip-flop to divide the frequency. This does not work well. Apparently generating the pulse train picks up noise and I end up with a 60 KHz signal with fluctuating phase. Now I’m trying to get a Miller frequency divider working, but that’s not operational right now. Anyone have any other ideas?
John Reed
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