[time-nuts] 60 KHz Receiver
K3WRY at aol.com
K3WRY at aol.com
Mon Oct 4 20:53:30 EDT 2010
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--------------------------------
In a message dated 10/4/2010 3:12:18 P.M. Eastern Daylight Time,
sandeenpa at yahoo.com writes:
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
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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