[time-nuts] 60 KHz Receiver
paulswedb at gmail.com
Mon Oct 4 19:22:56 UTC 2010
Its not just diurnal shift it plain old jumps anytime.
Have been monitoring for periods from the eastcoast using both a Tracor 577
and 2 X HP vlf117 rcvrs. All kinds of stuff occur.
But then the older gents know all about that reality.
Some may speak up.
I like you want a second source but will say I was spoiled by loran. Maybe I
did not realize how much. Even though my first loran timing recvr was
homebrew in about 1989 as I recall.
How far are you from wwvb??
On Mon, Oct 4, 2010 at 3:11 PM, Perry Sandeen <sandeenpa at yahoo.com> wrote:
> 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.
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