[time-nuts] WWVB Translation

paul swed paulswedb at gmail.com
Sat Oct 27 21:53:41 EDT 2018


Andy agreed I wrote about the requirements for stability when I built mine
up.
I did not need to add a amplifier I simply attenuated the output of the
tristate gate to get to the 1000uv level then filtered and split to 6
outputs. One drives the antenna the others drive coax's to truetime and
symetricom clocks. They really look nice. Silly but what the heck.
I agree if I need more power a FET stage is the way to go. Just don't so
far.
Hmmm maybe mid next year I can build a 100 watt amp to cover our town. Not
really. The antenna would be quite a challenge. But I hear I can pick a few
towers up for shipping costs real soon now. Even with matching networks.
Regards
Paul
WB8TSL

On Sat, Oct 27, 2018 at 8:55 PM Andy Backus <ANDREWBACKUS at msn.com> wrote:

> I should have credited the loop idea as you did, Paul.  I don't know who
> it was, but thank you.
>
>
> I would leave my translator on all the time if it weren't for my La Crosse
> -- whose reception would be ruined.
>
>
> In my system, BTW, a resonant tank precedes a FET amplifier, which
> provides the antenna current.  I have found, as others have, that the
> frequency must be good to several Hertz.  So I use a crystal controlled
> CMOS gate oscillator to generate the RF.
>
>
> Andy Backus
>
> WA2TND
>
>
> ________________________________
> From: time-nuts <time-nuts-bounces at lists.febo.com> on behalf of paul swed
> <paulswedb at gmail.com>
> Sent: Saturday, October 27, 2018 4:01 PM
> To: Time-nuts
> Subject: Re: [time-nuts] WWVB Translation
>
> Andy pretty much what I did also. A loop in the basement as suggested by a
> time-nut.
> Radiations quite low depending on the floor of the house and walls its
> 100uv to 30 uv.
> Did resonate it with a cap that seemed to improve things. But no matter it
> works for what I need and the clocks are happy.
> I leave the simulator on all of the time now as no matter the time of the
> day or battery change the clocks lock in the 3 or so minutes.
> Since I don't own an official lacrosse no issue here though perhaps mid
> January I will pick one up cheap... Chuckle.
> If I do I guess l'll have to build a BPSK version. Oh hang on there thats
> what the de-psk-r is. Just add 60 KHz. Actually depending on the clocks
> cost as they get dropped maybe not a bad idea. Have fun with your system.
> Regards
> Paul
> WB8TSL
>
> On Sat, Oct 27, 2018 at 6:04 PM Andy Backus <ANDREWBACKUS at msn.com> wrote:
>
> > For those still interested in GPS to WWVB simulation -- after trying a
> few
> > antenna designs I found that a 50-foot loop of #26 enameled wire stapled
> to
> > the rafters in the basement works quite well.  Putting 35 ma (rms) of 60
> > kHz WWVB signal through it lights up the house quite nicely.  I don't
> know
> > yet if it also lights up the neighbor's house.  I think I will
> investigate
> > that question when (and if) they pull the plug in Colorado.  But I am
> > prepared.
> >
> >
> > Not so much for my La Crosse Technology WWVB BPSK clock.  I think it will
> > get swamped out.  Can't have everything, I guess.
> >
> >
> > Andy Backus
> > _______________________________________________
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