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" <paulsw...@gmail.com>
To: "Discussion of precise time and frequency measurement"
<time-nuts@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, <k3...@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,
sandee...@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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