[time-nuts] WWVB information

Tom Van Baak tvb at LeapSecond.com
Thu Apr 12 23:07:37 EDT 2018

I've been talking with Doug to better understand why his Spectracom WWVB receiver shows the green lock indicator. This receiver should not work given the enhanced WWVB modulation we've had since 2012. Fortunately he has chosen not to touch anything while we ponder this.

Meanwhile I pulled out some Spectracom gear (8164) and was able to repro his green lock! But the 10 MHz output is very unstable so I'm pretty sure it is not locking at all. Looking at the schematic the green indicator seems primitive. So "lock" may not really mean it has robustly locked to the carrier. More details to follow.

If any of you have Spectracom WWVB 816x or 817x receivers you might want to try them too.


----- Original Message ----- 
From: "Martin VE3OAT" <ve3oat at storm.ca>
To: <time-nuts at febo.com>
Cc: "Doug Millar" <drzarkof56 at yahoo.com>
Sent: Thursday, April 12, 2018 5:12 PM
Subject: Re: [time-nuts] WWVB information

> Hi, Doug,
> How is your 8161 doing now?  Still synced properly?  Should I bring my 
> 8164 up from the basement?  I was so disappointed when WWVB changed 
> their modulation.  Thanks for any encouragement.
> 73,
> ... Martin    VE3OAT
> On Wed, 11 Apr 2018 16:28:41 Doug Millar wrote :
> > Hi, My Spectracom 8161 comparator and 8171A clock are chugging
> > right along in sync with the proper time. I have only looked at
> > the digital LED output and it is within one second of my other
> > WWVB  clocks.  Seems like magic. It came in synch about two
> > weeks ago and stayed there. I haven't changed anything in my
> > lab or moved the units. Antenna is still the same.
> > Pictures available. Doug K6JEY
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