I meant to add because I designed the first version, I'm excited to
see it coming back to life.
Of course most of the original hardware that controlled the timing
of the signals has been replaced by an FPGA...
Bob
Dave,
The van is at Timing Solutions -> Symmetricom ->
Microsemi ->
Dave,
The van is at Timing Solutions -> Symmetricom ->
Microsemi -> Microchip Technology. I designed the hardware for the
first incarnation of eLoran which was funded by the FAA as a backup
for GPS.
Bob
Hi Bob-
Is the van still open to viewing? I'm in Boulder as well, must be
at NIST?
Chris wrote:
How about using the open frame linear supplies like the ones from Power One or
Lambda?
I have had very good results with Deltron open-frame linear supplies.
They have selectable mains voltage and low output noise (1mVrms/5mVp-p).
I have used many (i.e., hundreds) of the Model
I *just* put pieces together for my project. It's in a 2U rack case. AND
REALIZED RACK FLANGE IS ON BACK PANEL! Geez... Now, I have to re-drill some
holes and turn it around. This particular case has integrated flange. It's
part of the side panel - and power supply is mounted there. I
Thank you for your warning. Have not bought Traco but was considered after
Poul-Henning recommendation. Will stay with Mean Well have plenty good
experience, a couple % more efficiency was tempting no more
Bert Kehren
In a message dated 2/8/2020 4:43:02 PM Eastern Standard Time,
That really is exciting. H hope the testing goes well.
A comment. When ursanav was heavily testing 2013 region I had one of there
stations here along with a HP5071 Cesium. They obtained data, I obtained
serious fun.
But what is very interesting is the LORAN antenna is no larger than some of
Jeffery would be interested in your square loop antenna design.
With respect to square loops for wwvb I use a 10' X 10' antenna with preamp
something like 800' od wire in the loop and cap to resonate with a preamp.
As mentioned the stations in NJ so you will not hear it.
Wildwood is actually a
Learned Gentlemen,
FWIW
Although closed until April 2020, due to an injury, Dan's small parts has
always had a great selection of chokes and capacitors for very good prices.
Regards,
Perrier
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Learned gentlemen,
For anyone interested, there an extensive article on GPS problems in the
February 2020 issue of Fortune magazine.
Regards,
Perrier
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Hi Bert,
Make sure to measure the noise on the Traco (on both input and output)
We had some issue with noise from a couple of Traco models at work. We
changed to Mean Well, and much less noise
Br,
Askild
On Sat, Feb 8, 2020 at 8:10 PM ew via time-nuts
wrote:
> Just got this in the mail I
Hi Bob-
Is the van still open to viewing? I'm in Boulder as well, must be at NIST?
Dave
On Sat, Feb 8, 2020 at 2:07 PM Bob Martin wrote:
> On Friday I was given a tour of a van that is
> being outfitted to monitor eLoran signals.
> Pretty exciting.
>
> Bob
> Boulder,CO
>
>
Wildwood, New Jersey/ Near Cape May
On 2/8/2020 2:21 PM, Jeffrey Pawlan wrote:
I still have my Austrom LORAN receiver and the square loop antenna. It
always seemed to have better stability than GPS so I was sad when they
shut it off.
Where is Wildwood and also does anyone know if there
On Friday I was given a tour of a van that is
being outfitted to monitor eLoran signals.
Pretty exciting.
Bob
Boulder,CO
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I still have my Austrom LORAN receiver and the square loop antenna. It
always seemed to have better stability than GPS so I was sad when they
shut it off.
Where is Wildwood and also does anyone know if there will ever be a
station in the West Coast? I previously used Fallon NV. I am in San
Just got this in the mail I am sure they have related items.
We use with very good results Mean Well SD DC/DC products, for my Rb 8607
project I plan on using Traco Power
Hi
Grab your DVM and take a look at the voltage on the input caps on one of those
supplies as compared to the output voltage. With light loads (which is how most
use them …) the voltage ratio is pretty high. As a result, the efficiency is
not as
good as it could be.
The Acopian versions that
Hi Taka,
How about using the open frame linear supplies like the ones from Power One or
Lambda?
I usually pick these up when I find them, recap if needed and they're a cheap
and easy way to get a supply.
Chris
KD4PBJ
> On Feb 6, 2020, at 4:29 PM, Taka Kamiya via time-nuts
> wrote:
>
> I
Hi
DC/DC converters can indeed be filtered. If you do it wrong, things will get
pretty crazy. In
general, you need at least an L/C filter and may need an R/L/C design. Things
like ESR
on the caps and SRF on the inductors do indeed matter. Both common mode and
differential
mode filtering may
Right now, my problem is where to strike a reasonable yet good compromise.
I thought of using DC/DC but these are quite noisy, and noise comes from both
ends. I had one powering distribution amplifiers. For an experiment, I placed
a ferrite bead on the output and the whole thing oscillated
Hi
As you have already noted, things do die from time to time. Fuses are a good
idea, along
with protection diodes. Still, none of it is 100%. The more heat / temperature
you have in
a part, the quicker it is likely to fail.
One often overlooked failure mode is loosing one supply on a +/-12V
On 2/7/20 7:01 PM, Taka Kamiya via time-nuts wrote:
I recall S-100 scheme had an issue of per-board regulator failing short and
dumping 8V into bus killing rest of the system
More like the 5V regulator (most likely a trusty 7805 in a TO-3 package)
shorting, applying 8V to all those TTL
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