[time-nuts] 60 KHz Receiver

[paul swed]

Yes indeed. I also have a hp rcvr. But Pauls request was for an alternate
approach.
I regularly matched LORAN C wwvb and GPS. It was nice having an alternate.
wwvb really isn't but its about all we have now.

On Mon, Oct 4, 2010 at 8:53 PM, <K3WRY at aol.com> wrote:

> All
> All of this design and mod info is wonderful and great to fill an
> engineering project workbook.  You can spend about $500US and get a
>  complete HP
> working system including GPS antenna which I have been monitiring to  10-12
> for
> 14 mos now and it is stable--------------------------------
>
> Dr Joe
>
>
> In a message dated 10/4/2010 3:12:18 P.M. Eastern Daylight Time,
> sandeenpa at yahoo.com writes:
>
>
>
> Gents,
>
> Thanks for all the input on the HP 3586B and the  Austron Loran C receiver.
>  I’ll try to distill what’s been  said.
>
> It appears that using the HP 3586B for a WWVB receiver isn’t a  good idea
> unless I would use my HP 3336B or some other method to phase lock  the BFO.
> Since this seems to be way out of the KISS principle, I will go  to plan B.
>
> I appreciate the clever circuit to convert the Austron to a  phase detector
> but the effort required to get just a phase detector alone  isn’t cost
> effective for me.
>
> Opening up the Austron shows that there is  a great deal of space.  If the
> three Loran boards are gutted one of my  Lucent Rubidium or Xtal standards
> will just fit in their place.  The  power supply appears to be robust for
> the
> power required.  If not, there  is space to add on.
>
> So to try to maximize the salvage of my purchase  it looks like I should do
> the following.
>
> 1.  Gut the Loran boards  and get a Lucent unit installed and working.
>
> 2.  Build a big  honkin’ quality 60 KHz loop antenna.  I live in the
> country so I can put  up any size I can afford.
>
> 3. Convert the Austron RF amp boards to 60  KHz if I can get a schematic
> and get lucky.  Does anyone have one or know  where I could download it?
>
> 4.  If I don’t get lucky, build a TRF  receiver in place of the Austron RF
> boards.  60 KHz crystals are cheap  from Mouser.  Does anyone have
> experience building a ladder or similar  crystal filter?
>
> 5.  After I get a good working 60 KHz signal,  I‘ll divide it by six and
> apply it to a Talbot 10 KHz phase detector.   The Talbot circuit divides
> the
> 10 MHz reference oscillator to 10KHz using  74HC390 decade dividers.  It
> then
> provides a correction circuit to the  reference oscillator from its phase
> detector.  Since the Talbot circuit  on uses about six IC’s it will fit
> nicely in the rear chassis area.
>
> The  goal, when completed, is to have a WWVB phase locked oscillator (yes I
> have to  figure out what to do about diurnal shift) a reference frequency
> output and  perhaps add a second Talbot phase detector circuit and meter
> for
> calibrating  other oscillators.
>
> Yes, the GPS is more accurate more quickly but the  issue is to have a
> second independent source for cross-checking.  Though  highly unlikely, GPS
> satellites can be shot down, disabled or turned off or  have their outputs
> modified at any time.
>
> Comments?
>
> Regards,
>
> Perrier
>
>
>
>
>
>
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