[time-nuts] 60 KHz Receiver

[Heathkid]

Doesn't someone on here with a Ham license have a Cs standard and "could" 
put up a 1pps signal?  Simply transmit your callsign within the 1pps (there 
has to be a way) and we have a non-Govt. time standard "if needed".  A 
simple 1pps PSK-31 (or other digital mode) signal would probably work and be 
completely legal.  Let's do this on our own and not rely on Govt. or GPS... 
Several throughout the world acting together (I'm not a programmer so 
someone could step up and figure out the logistics for a receiver) and we 
would have an alternative to GPS (IF/when it stops working).

Yes?  Just a thought...

73 Brice KA8MAV

----- Original Message ----- 
From: "paul swed" <paulswedb at gmail.com>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Sent: Monday, October 04, 2010 10:53 PM
Subject: Re: [time-nuts] 60 KHz Receiver


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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