On 6/26/2014 10:45 PM, David J Taylor wrote:
Amazon UK want over $200! A Garmin GPS 18x LVC would be half the
price..
Cheers,
David
The UK Amazon listings are crazy. There's a listing of the USB version
at 35 pounds or about $60 (still pretty high) but the only serial
version listed
t...@leapsecond.com said:
Yes, I remember that I cut off the PS-2 connector before the UPS truck even
left the neighborhood. You are then left with nice 0/+5/Tx/Rx wires, which
is all you need for navigation and status. For 1PPS timing, in either the
serial or USB version, unscrew the case
http://www.ftdichip.com/Products/ICs/VNC1L.htm
On 6/26/2014 3:39 PM, time-nuts-requ...@febo.com wrote:
USB may be a common interface to a computer but practically useless to
another microcontroller.
Everything can do serial but not everything can do USB master. In the worst
case, use a
US GS MR350P/S4 has PPS connected
http://www.usglobalsat.com/store/download/713/mr350ps4_ds_ug.pdf
On 2014-06-26 14:59, Tom Van Baak wrote:
David,
Also check the web/eBay for: GlobalSat GPS BU353 S4
Dirt cheap, well made, water proof, high performance, NMEA or binary. They come
in both
I have never seen an article using exotic special tubes. I understand that
benefit but common tubes do a fine job. I still believe it was a QST
article. Maybe 73 magazine. It was a long time ago. When I started using
the 12AU7s again for the vlf pre-amp they were $1 or so 7 years ago. Now
Let's see - lightning is basically a powerful spark. How about a
home-made Marconi coherer?
You don't have to go back in time to get one, and the audiophools
haven't found a use for it.
Bill Hawkins
-Original Message-
From: paul swed
Sent: Friday, June 27, 2014 8:10 AM
How to make a
I think the QST article being referred to in this thread is one that I
remember rather clearly. I kept the issue for a long time but it got away
from me somewhere along the line. It was a lightening direction finder
using a display much like a radar PPI. It used two crossed untuned loops
You might be thinking of the file that David Byrne sent to the HP list last
year on 9/7/13. It was an article by C. L. Stong and I think it was published
in The Amateur Scientist in 1963. You should be able to find it in the HP list
archives.
Bob
From:
On 6/26/2014 2:39 AM, mike cook wrote:
A few dumb questions:
But first a quote from the ITU ( doc G.180 )
4.1.12 (timing) jitter: The short-term variations of the significant instants
of a timing signal from
their ideal positions in time (where short-term implies that these variations
are of
On Fri, Jun 27, 2014 at 6:10 AM, paul swed paulsw...@gmail.com wrote:
I have never seen an article using exotic special tubes. I understand that
benefit but common tubes do a fine job. I still believe it was a QST
article. Maybe 73 magazine. It was a long time ago. When I started using
the
It was QST and Max is right. I built it. There was a e-field antenna for
amplitude and the crossed antennas the XY access. I guess the old brain has
somethings correct.
Now can I remember the tube line up. Heavens no. :-) The CRT was a little
mil surplus 3p...
But enough of that. Whats the chance
Brian,
Thanks for the pointer to the model 350. I can see that it has a more rugged
design. Nice it has 1PPS in the cable. Price is only modestly more than models
353/355.
Here are photos of the little PCB inside of my BR-355S4 (serial) and BU-353S4
(USB). The patch antenna is on the other
For a new design I'd re-think the entire architecture. Back in the 1980's
It made sense for a small instrument to push data over a cable to a bigger
computer where the data could be logged and displayed. The cost and
physical size of the computing power to log and display data was large.
Times
When currents are discharged into the earth (by lightning or power line
faults), there is a phenomenon known as Ground Potential Rise. That is,
as currents flow omni-directionally (earth is a giant resister, so current
flows in many directions like a huge parallel circuit), the point nearest
the
There are old TrueTime NTS-100 IRIG units that pop up on ebay from time to
time. However they usually require an AUI to UTP adapter.
Also they only serve Version-3 of NTP... (which some clients you have to
explicitly set that in the server line).
There are also the Datum/Bancomm/Symmetricom
I am not too concerned about a direct hit as the antenna would be under the
roof, and I have not had a direct hit to the house (yet) in 22 years but I am
concerned about a close hit that could still generate hundreds of volts. I
regularly (like every year or two, yes, it is getting old) replace
Bert asked me to send an update on the FE-5680 tempco mod progress.
It appears that the FE-5680A temperature signal (or maybe it's really
a current sense signal?) can be disabled by removing a single 10k
0805 surface mount resistor.
Using Elio Corbolante's terrific high-res scans, I've noted
If you want to see how to generate TSIP message, I can post the code to my
Thunderbolt simulator. Its in Visual Basic but it will show you an example.
It generates the primary and secondary packets.
You can download the software from my web site www.ko4bb.com
Didier KO4BB
On June 26, 2014
So the FE5680A will actually change the DDS tuning word based on an
internal temperature sensor?
I could see why you might ant to disable this or maybe not depending
on how it works. Does the FE5680 first read the user programmed word,
apply a delta then write it back or does it ignore user
I am quite familiar with that chip which perfectly illustrates my point. A
universal serial/USB Master interface it is not.
Didier KO4BB
On June 27, 2014 7:14:34 AM CDT, Dan Kemppainen d...@irtelemetrics.com wrote:
http://www.ftdichip.com/Products/ICs/VNC1L.htm
On 6/26/2014 3:39 PM,
At 10:03 PM 6/27/2014, Chris Albertson wrote:
So the FE5680A will actually change the DDS tuning word based on an
internal temperature sensor?
It appears so. (Again, assuming it's actually a temperature sensor. I
guess it could be measuring heater current?)
on how it works. Does the
At 10:40 PM 6/27/2014, Scott Newell wrote:
to pin 4 of the 4 channel 12 bit ADC. Command 0x22 returns the ADC readings
Doh! Correction: command 0x5A reads the ADC, command 0x22 reads the
DDS tuning words. Sorry for the confusion.
--
newell N5TNL
The only C.L. Stong (W2PFM - great call!!!) article that I could find at QST
came up in an archive search: How to Cook a Ham from March 1947
A story about not having safety interlocks and getting zapped.
http://p1k.arrl.org/pubs_archive/28044
You need to be an ARRL member to access the file.
C. L. Stong wrote The Amateur Scientist articles in Scientific American
magazine for many years, throughout the 1940s - 1960s and later period.
As a child, I read these avidly and built many of the things he
described. I did not know he was a ham!
All The Amateur Scientist articles are
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