I reassembled the failed unit and booted it up.
The internal working voltage is 15.3V,
the unis seem similar to 5680A, and has
even the footprints for a DB9 connector
in the same position of the 5680A.
I will try to spot if it carries the same
signals than that unit.
As I was expecting the failed
I've got nothing running at the moment that decodes or locks to DCF77, and
obviously can't comment on the possibility of localised interference, but
here on the west coast of Scotland the signal certainly looks and sounds
just as it always does.
It's a nice clean signal peaking at approx
Here in north Italy (QTH locator JN45UJ) the DCF77 reception is regular.
On Tue, Jan 1, 2013 at 1:40 PM, Anthony G. Atkielski
anth...@atkielski.comwrote:
For the past several days (now thirty hours straight), none of my
radio-synchronized clocks has been able to synchronize with DCF77. Is
Hi Anthony, is there any possibility that you have a source of local
interference that started up in your home or area?
From time to time, I have had everything from power line arcing noise to a
new computer power supply that was generating a high level of interference
blocking signals on
In message 01cde828$6a8e29d0$3faa7d70$@com, George Race writes:
Hi Anthony, is there any possibility that you have a source of local
interference that started up in your home or area?
For DCF77 a very typical source of trouble is old CRT-based televisions
or monitors, since 15625 Hz
Hi
The only problem you may run into with an input capture is that the 72 MHz may
be from an internal VCO that's locked to the external clock source or crystal.
Often these micro's don't have VCO's that are as good a one might hope. You
will indeed have less than 1 UI jitter, you may not have
On Tue, 1 Jan 2013 11:23:57 -0500
Bob Camp li...@rtty.us wrote:
The only problem you may run into with an input capture is that the
72 MHz may be from an internal VCO that's locked to the external clock
source or crystal. Often these micro's don't have VCO's that are as good
a one might hope.
On 01/01/13 17:34, Attila Kinali wrote:
On Tue, 1 Jan 2013 11:23:57 -0500
Bob Campli...@rtty.us wrote:
The only problem you may run into with an input capture is that the
72 MHz may be from an internal VCO that's locked to the external clock
source or crystal. Often these micro's don't have
Hi
Most of the small micro's don't get very fancy on the clock chain. You are
lucky if the VCO is running at twice the CPU clock. In some cases the input
capture(s) (and PWM's) are running directly on the VCO (at say 72 MHz) and the
CPU is running at half or a quarter of that.
Bob
On Jan
Hi Anthony, is there any possibility that you have a source of local
interference that started up in your home or area?
Maybe, but I'm not sure where it would come from. It's been like this
for days, and today there is no reception by any of the clocks at all.
If just one clock failed to
For DCF77 a very typical source of trouble is old CRT-based televisions
or monitors, since 15625 Hz * 5 = 78125 Hz
I suppose someone nearby could have received a collector's-item
Trinitron for Christmas.
What about Wi-Fi, cell phones, and such? They are way far away in
frequency, but I'm not a
On 01/01/2013 09:54 AM, Anthony G. Atkielski wrote:
For DCF77 a very typical source of trouble is old CRT-based televisions
or monitors, since 15625 Hz * 5 = 78125 Hz
I suppose someone nearby could have received a collector's-item
Trinitron for Christmas.
What about Wi-Fi, cell phones, and
Hoi Bob,
On Tue, 1 Jan 2013 12:03:49 -0500
Bob Camp li...@rtty.us wrote:
On Jan 1, 2013, at 11:34 AM, Attila Kinali att...@kinali.ch wrote:
What about those uC that use a VCO that runs up at several 100MHz (i've
seen up to 800MHz) and devide it down to what they actually need.
Shouldnt
Hi
The little Arm7/ Cortex-M3 micro's don't pay as much attention to the clock
chain as some of their bigger brothers (like a Sandy Bridge I7) do. At least
the M3's and M4's I have seen are running the VCO at 50 to 150 MHz to generate
a CPU clock at that frequency. The clock is divided by two
Hi
The first thing to think about is what did I get for Christmas?. If it runs
24 hours a day, it might be the source of the problem. Just about anything
*could* have a switching power supply in it these days. It could be as silly as
the plug in the wall charger for a cell phone.
Bob
On Jan
In message 1991305643.20130101185...@atkielski.com, Anthony G. Atkielski wr
ites:
What about Wi-Fi, cell phones, and such? They are way far away in
frequency, but I'm not a radio engineer. Anything high-tech that could
interfere?
Far more likely are switch-mode power-supplies, either in
Hi
Could be that neighbor with the 1,000,000 light Christmas display ….
Bob
On Jan 1, 2013, at 2:14 PM, Poul-Henning Kamp p...@phk.freebsd.dk wrote:
In message 1991305643.20130101185...@atkielski.com, Anthony G. Atkielski
wr
ites:
What about Wi-Fi, cell phones, and such? They
Hi
I'm not bashing the Arm parts, they are nice gizmos. They don't do the clock
chains the way they do because they are lazy. They very much plan things out.
Their main target audience is low power portable gear. Having a part that drops
down to very low current when nothing much is going on
Could be that neighbor with the 1,000,000 light Christmas display
.
Hmm ... that sounds like a likely culprit. There are some Christmas
lights nearby. We'll see if the problem disappears with the lights.
Good ideas, thanks Bob and Poul.
--
Anthony
In message aa21d17c-0ff4-4b22-b3a3-43ac2b9da...@rtty.us, Bob Camp writes:
I'm not bashing the Arm parts, [...] They worry about every uA of
current drain
True story:
Many years ago when the very first ARM silicon arrived and they started
testing it, it was generally execeeding
Take a close look at the photos of Malones nice little voltage reference boards
(http://www.voltagestandard.com/Home_Page_JO2U.html). The voltage reference
chip is mounted on an isolated peninsula of PC board material to help isolate
it from stress due to environmental changes.
I have had that problem more than once. Missing Vcc on a chip but the thing
runs, just not necessarily well enough, or well enough to go through the next
level of test.
I have also used it when adding an inverter somewhere on a clock line, and a
decoupling cap on the inverter's Vcc is enough
If you can look at the output of a DCF77 demodulator you should see a nice
clean set of 100ms/200ms pulses every second. All you need is a CRO, or you
could just use a LED to indicate the state.
On 2 January 2013 01:00, George Race geo...@mrrace.com wrote:
Hi Anthony, is there any possibility
The NXP LPC111x series has a PLL that runs at 156 to 320 MHz. You then divide
the clock down (internally by 2,4,8, or 16) to what you want. 50 MHz is the
max. for the LPC111x series. Giving you capture ticks in 20nS increments.
I have some experiments in the works with an LPC1114 chip and a 40
In message 1357073110.35421.yahoomail...@web160905.mail.bf1.yahoo.com, M. Si
mon writes:
The NXP LPC111x series [...]
My personal preference is the LPC1343, because it has a USB port, and
because there is a reltively nice codebase to start from:
On 1/1/13 12:16 PM, Poul-Henning Kamp wrote:
In message aa21d17c-0ff4-4b22-b3a3-43ac2b9da...@rtty.us, Bob Camp writes:
I'm not bashing the Arm parts, [...] They worry about every uA of
current drain
True story:
Many years ago when the very first ARM silicon arrived and they started
The design I'm working on brings out the UART pins to a header. I am designing
adapter boards for RS-232 (using a MAX232 type equivalent) or USB using the
FT232RL chip for the USB interface. There will also be an I2C interface for a
display (16X2 to start with) or what have you. (more serial
I should add that the first published design will probably be a
frequency/period counter. It will have an input for an external 10 MHz
reference.
Simon
Engineering is the art of making what you want from what you can get at a
profit.
From: Poul-Henning
On 1/1/2013 9:42 PM, Tom Harris wrote:
If you can look at the output of a DCF77 demodulator you should see a nice
clean set of 100ms/200ms pulses every second. All you need is a CRO, or you
could just use a LED to indicate the state.
This is how DCF77 looks, when received with an SDR
Hi
The VCO is part of the process, the PLL and it's loop are another part. There's
no reason why they can't put a good loop in a micro, other than chip area for
the passive parts. What ever they do, the loop will probably be a compromise,
since the frequencies involved are not known at design
On 27 Dec, 2012, at 15:13 , Magnus Danielson mag...@rubidium.dyndns.org wrote:
On GE, a full-length packet is about 12 us, so a single packets head-of-line
blocking can be anything up to that amount, multiple packets... well, it
keeps adding. Knowing how switches works doesn't really help as
Hi
The problem with your approach is that you can depart from normal for very
long periods of time. Consider my home network, running NTP to external
sources. Around 4 in the afternoon all the kids get home and start streaming
video. At 7 I get home and start doing the same thing. We each keep
On 1/1/2013 9:42 PM, Tom Harris wrote:
If you can look at the output of a DCF77 demodulator you should see a nice
clean set of 100ms/200ms pulses every second. All you need is a CRO, or you
could just use a LED to indicate the state.
This is how DCF77 looks, when received with an SDR
I hereby resolve to look at the subject line of every message I send and
change it if necessary.
Regards.
Max. K 4 O DS.
Email: m...@maxsmusicplace.com
Transistor site http://www.funwithtransistors.net
Vacuum tube site: http://www.funwithtubes.net
Woodworking site
Yay for Forth!
Don
M. Simon
The design I'm working on brings out the UART pins to a header. I am
designing adapter boards for RS-232 (using a MAX232 type equivalent) or
USB using the FT232RL chip for the USB interface. There will also be an
I2C interface for a display (16X2 to start with) or
35 matches
Mail list logo
