Off topic for our usual faire, but I have a working Edison Cylinder
machine with the Blue Bell horn with a playback and recording
head. I have several cylinders but no blanks. Simple technology,
but what has always amazed me is the ability to bring back to life
artists such as Caruso, John
Scott,
It doesn't look like AT-cut. AT-cut oven crystals are run at their upper
turnover point, which is a minimum, so the frequency starts high from power up
at normal room temperature.
With SC-cut, the f/T curve is shifted to the right and they are operated at
their lower turnover point (a
The issue of the recording stylus apparently moving backward along the time
axis shouldn't be a mystery to anyone who remembers the old Brush (brand
name) galvanic chart recorders. The pen tip moved in an arc rather than
rectilinear and for slow paper movement the graph appeared to move
It only appeared that way if you were using the wrong paper for the
chart recorder. Those that had needles that moved in an arc also had
chart paper that was ruled using lines in the T axis, and arcs in
the X axis.
-Chuck Harris
Max Robinson wrote:
The issue of the recording stylus apparently
11/08/2014 18:26
I have 4 windows based PC's on my home network, for years i have used
Meinberg or an equivalent to set the PC time. I was wondering if I
could, or should, use my permanently on Trimble Thunderbolt to set the
PC clocks? Any advantages or disadvantages. I believe there's a way
So who could afford Brush paper? I had hundreds of feet of adding machine
paper (cheap!)
If your fingers ain't purple, you ain't doin' science...
Don
Chuck Harris
It only appeared that way if you were using the wrong paper for the
chart recorder. Those that had needles that moved in an arc
I have 4 windows based PC's on my home network, for years i have used
Meinberg or an equivalent to set the PC time. I was wondering if I
could, or should, use my permanently on Trimble Thunderbolt to set the
PC clocks? Any advantages or disadvantages. I believe there's a way to
use Lady Heather
On Mon, Aug 11, 2014 at 10:29 AM, Chris Wilson ch...@chriswilson.tv wrote:
11/08/2014 18:26
I have 4 windows based PC's on my home network, for years i have used
Meinberg or an equivalent to set the PC time.
The best way the keep the PC clocks in sync would be to run NTP on all
the PCs.
I did some more playing around with the 3458A memory dumper this weekend. I
built up another system using a different computer/cables/software/GPIB
interface (one I built using an AVR chip that emulates the Prologix RS-232/USB
converter). I noticed than a couple of dumps of the CAL ram
In message blu170-w839a5d44106a8aed622d67ce...@phx.gbl, Mark Sims writes:
I did some more playing around with the 3458A memory dumper this
weekend. I built up another system using a different
computer/cables/software/GPIB interface (one I built using an AVR
chip that emulates the
ch...@chriswilson.tv said:
I have 4 windows based PC's on my home network, for years i have used
Meinberg or an equivalent to set the PC time. I was wondering if I could, or
should, use my permanently on Trimble Thunderbolt to set the PC clocks? Any
advantages or disadvantages. I believe
Assuming you mean Meinberg Radio Clock, and you are also using Meinberg
or generic NTPD to talk to the Meinberg radio clock:
You can configure NTPD to use two stratum-0 refclocks hooked to the same PC
- you can make one be the Meinberg radio clock, and have the other be
hooked to the Trimble
If your fingers ain't purple, you ain't doin' science...
A blast from the past, when the output was recorded as a line on paper. I
remember those recorders with pens that had to be filled from a bottle of
ink, purple and green were popular colours, and both stained your fingers.
As a bonus it
LOTs of suggestions here but I'd do this first:
1) Define the timing requirements for Ham digital modes. Are you on HF or
microwave? what level of accuracy do you need?
2) Read all the documentation on NTP you can. Start here:
http://www.ntp.org/documentation.html
So many people don't
Please excuse this commercial announcement (although it's still a near-zero
profit project).
There has been enough accumulated interest for me to consider doing a second
build of the 5370 processor replacement boards.
If you are interested, but have not previously done so, please fill-out the
I got in my prototype extender cable boards from OSHPARK.COM today. OSHPARK
only builds boards in multiples of 3 and I only ordered three boards so could
only build one cable. It seems to work very well. I tested it with several
different TM500 and TM5000 modules (using another set of cables
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