Hi Paul -
If you can spend time on that:
1. Look for the different modulation spectrum between BPSK and RDS. The
phase modulation angle is different, the bits are manchester encoded or
such to get a hole on the carrier frequency (For the ARI carrier), the
baseband is DBPSK.
2. Carefully
paul swed schrieb:
To the saa6579
As mentioned in the other thread.
Simple to hook up.
Cheap
Requires 1000uv or more so that ends up making things more complicated.
S/N is important, not so absolute amplitude.
But in my case simply did not really work at 57 or 60 Khz.
The chip looks for
Maybe, it is on my list for the university IEEE download for months.
And this is the only reference?
I have seen some similar issues in a few BPSK receiver papers. Not for
time-nuting but for S/N.
- Henry
Magnus Danielson schrieb:
On 07/22/2012 01:39 AM, Bob Camp wrote:
HI
The Collins
Interesting discussion but I must say I had several times a
brain-problem here ;-)
Am I right that for that this is in general not fully understood? Are
there interesting papers?
I'm interested here for two points:
1. What is the right threshold for a comparator and on what it depends?
Looks
On the Bruce page there is a table with increasing stage amplification
from low-level to the output.
If this is the optimum for low jitter how does it connect to the
well-known rf design philosophy to have the highest amplification at the
first stage, not the last stage, to have maximum S/N ?
Demian Martin schrieb:
If you don't want a delta sigma ADC you can substitute a different
kind but
there will be tradeouts. Usually bit depth vs sample rate vs. accuracy.
Any market overview available?
A simple way to discipline a 22.5792 and a 24.576 VCXO to a 10 MHz reference
would be
Bill Hawkins schrieb:
Around 1530, it was considered very bad luck to walk around a church
widdershins (see the Wikipedia article). I think it goes back earlier
than that, to a time well before clocks.
They wrote at Wiki:
Because the sun played a highly important role in primitive religion,
Jim Lux schrieb:
widdershins derives from Middle low german weddersines from Middle High
German widersinnes, wider=back + sinnes=in the direction of
widersinnig means 'nonsense' = not useful in the common thinking.
The german wider- means 'against something'. There is another german
word
Hm. Is the paper now online or do I have to add it to my list of
downloads at next university trip?
Thanks -
Henry
Hal Murray schrieb:
enge...@alumni.ethz.ch said:
Building the best DCF77 receiver in the world :-)
You have found the right place. :)
--
ehydra.dyndns.info
Would be interesting if I can read it.
As far as I know even the IEEE grants the right to the author of his
paper to locate it on his own web-site for public download.
Thanks -
Henry
paul schrieb:
On 6/13/2012 3:46 PM, Daniel Engeler wrote:
Hi,
This is my first post to this mailing list.
Hi time-nuts!
If I remember correctly here was a discussion about an older HP
impedance measurement equipment. The one which is able to calculate a 6
ideal parts replacement circuit for the measured passive device.
How does is it works? I would like to fit parts for simulation in SPICE.
So
gary schrieb:
Just meditating out loud, if you were to go push pull with a ferrite
antenna AND you are winding it yourself, you could avoid the biasing
resistors by putting a center tap in the antenna itself, then tie that
center tap to an appropriate bias voltage. I haven't seen this done,
What makes me wonder: Why don't they adapt the DCF77 implementation? Is
it the not invented here syndrome?
At it looks like they never heard of Kasami sequences.
- Henry
Dennis Ferguson schrieb:
On 18 Mar, 2012, at 10:52 , John Seamons wrote:
They do talk about using the 11-bit Barker
Yes, his whole site is interesting stuff.
But the GPS was already mentioned here :-)
Even the Andrews variant.
- Henry
Tom Van Baak schrieb:
While researching Geraldo's GLONASS question I ran across
an amazing set of pages. It's the best documented homemade
GPS+GLONASS receiver project I've
Hm. I had a quick look at http://en.wikipedia.org/wiki/WWVB
I cannot see why it won't work with the DCF77 scheme. The carrier is
always on-air. Do I miss something? To low bandwidth of the transmitting
antenna?
Sorry, I didn't followed the thread in whole.
- Henry
Brooke Clarke schrieb:
Hi
Poul-Henning Kamp schrieb:
In message 4f64f279.4040...@arcor.de, ehydra writes:
Marek Peca schrieb:
This was almost the only reason for ferrite rod -- simplicity and
attenuation of TVs, some LCDs, 50Hz etc.
If you make the antenna about 10x bigger you can omit the whole
ferrite.
I
I wonder because ALL of the shown circuits in his pdf are AC-coupled.
It is maybe possible to servo-loop with OpAmps but surely not worth the
effort.
Useful too as a Scope FET-probe.
- Henry
Poul-Henning Kamp schrieb:
In message 4f65d971.8070...@arcor.de, ehydra writes:
http
Hi Marek -
I don't know where you are in CZ. I'm on the boarder in DE near PL and
CZ. The distance to DCF77 is about 450km and if I check the amplitude
across 24h I see considerable very deep fading effects! I think it is
useless as a phase-coupled time receiver. At least in specific
You must understand the difference between deionized and destillated
water! I think often they sell deionized water of poor quality as
destillated on gas stations etc. Much like destillated as a general
synonym for the best water.
If all fails, simple rain water is very good. Wait for a heavy
Marek Peca schrieb:
This was almost the only reason for ferrite rod -- simplicity and
attenuation of TVs, some LCDs, 50Hz etc.
If you make the antenna about 10x bigger you can omit the whole ferrite.
The only benefit of a ferrite loaded coil is the size of it!
In ancient time radios had flat
In the end every antenna receives the EM wave! The EM-wave is the far
field. The antenna works in the near field where a dominant component
can be the E or M. That depends on the antenna. Between the near and the
far field the field is converted and local Z0 highly complicated.
As far as I know
No, there is a geometric saturation. You can't use the better
permeability in reality.
The optimum length to width relation is about 6 to 10 for ferrite rods.
Here is a diagram:
http://ehydra.dyndns.info/NG/time-nuts/Pettengill%20002.jpg
This is one of the classics in my link list:
Azelio Boriani schrieb:
Yes, there is people who have what in the past was expensive test equipment
and now can be bought by 1/10 of the original price. The problem is that
you need someone who can record 2 seconds of a signal that is slightly
beyond the actual sound card sampling capability. A
At least in the USA one can patent pending even the neigboor's cat.
It looks in Germany we go now the same way. About 100 years ago one has
to be shown a functional device for patenting it. I think this was a
really good idea.
- Henry
Chuck Harris schrieb:
I was of the understanding that
I own a EMU0202 and when I use it with my laptop running on battery I
can see in spectrum lab FFT the DCF77 at 77.5KHz and the GB time-code
transmitter at 60KHz easily. The antenna is 1 meter of wire. Not bad for
100 bucks. I'm around 450km from DCF77 and maybe 800km from GB transmitter.
If I
Demian Martin schrieb:
I have tested a number of soundcards and while the EMU 2020 has issues
(serious jitter and noise from the USB interface) I can recommend the ESI
Juli@ as having flat response and good SNR up to 90 KHz. It's a PCI card, no
USB. I have measured the performance of FM MPX
) by the stereo deMPX
and then by the audio processor.
On Thu, Mar 15, 2012 at 2:08 AM, ehydra ehy...@arcor.de wrote:
Hi!
I'm looking for a sampled wave-file from a radio receiver MPX-signal
including the RDS frequency band around 57KHz. I searched the Net but found
just nothing that worked.
So I
Hi!
I'm looking for a sampled wave-file from a radio receiver MPX-signal
including the RDS frequency band around 57KHz. I searched the Net but
found just nothing that worked.
So I ask here. Maybe someone has the possibility to sample a couple of
seconds.
Thank you all!
- Henry
--
Looks like one can open it without problems.
- Henry
Detlef Twesten schrieb:
Hi,
does someone know the TQTC 16-01A from Tele Quarz Group?
I'd like to get the Pinout and the supply voltage to help an radio
amateur in Germany.
He tried it with 5V and the standard pinout, pin 3 supply, pin 4
I think most users have ADSL, where the problem is the low upload
bandwidth. If the connection drops, the whole file is lost.
The download is much faster and so there is a good change to save the
whole file.
If not:
If the web-browser and the file-owning server understand reconect, one
can
David schrieb:
I used Bittorrent last time to do this because of the ease and
reliability factor. There is no resuming since it does not work that
way and the whole process was just set and forget. HTTP and FTP can
usually resume aborted transfers as well but require explicit support
from both
Robert Darlington schrieb:
Typically you can resume ftp transfers with the reget command. It
has to be implemented on the server.
Interesting.
There are tons of file sharing services on the web that are free. Why
go back to the 1980s?
Because the problem is to send the whole file at
Thanks David and all the others!
- Henry
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and follow the instructions there.
Magnus Danielson schrieb:
On 01/19/2012 09:31 PM, Don Latham wrote:
Oh dear I had the wrong idea. Thought PIN's were designed for switching.
There is a breed of ultra-fast diode for protection in MOSFET
switching circuits like h-bridges. Any better?
Interesting idea! If it works, it is new
d.sei...@comcast.net schrieb:
could write tickets when you had enough hits on your car... Worst
offenders? BMW and Audi drivers...
Here in Germany too. The worst drivers are the ones with license plates
beginning with LB- AND driving Audi or BMW.
LB means Ludwigsburg - a city near Stuttgart.
Here is a hand-corrected version:
http://ehydra.dyndns.info/NG/time-nuts/Simple%20power%20supply%20ripple%20rejection%20for%20battery%20systems.zip
- Henry
John Lofgren schrieb:
There have been discussions in the past about ways to reduce regulator output
noise or clean-up oscillator or
In Germany hand-used phones during drive are banned for several years
now. I think it makes sense. Well, humanoids should think on it DIY but
the reality is another.
In China I've seen down-counting LED displays for the red sign. But this
is just to simple for Europe. Badly.
- Henry
Mark
Rex schrieb:
You might want to join this Yahoo group where the question would be more
on-topic...
http://tech.groups.yahoo.com/group/GeigerCounterEnthusiasts
The Photonis site is one of those flashy-looking places where you can
only find useful information if someone has already told you
The XOR phase comparator is without feed-back and that simply means no
dead-zone. This is consistent with literature on XOR PDs.
It will of course have non-linearity which is improving with speed of
the process technology. A 74HC4046 will be better than a CD4046.
BUT the low-frequency noise is
Is it possible to sketch the circuit? I can SPICE it.
Symmetry limiting is the holy grail and it is questionable if a discrete
design is way better than one of the chips.
Here is another limiter circuit (by Chris Trask):
David schrieb:
I could analyze it on SPICE but I suspect the real world construction
parasitics will be what limits the performance. I just sketched it
out in my notebook but I will see if I can post it somewhere. Is
there a quick and dirty online schematic capture site?
Scan it. I will
A 50K picture should fit the problem.
I successfully use 4000 series for amplifying a 5MHz PSK signal. The
HEF4x is a little faster than HCFx.
Or use a line-receiver if the oscillators is not buffered internal.
- Henry
Michael Malloy schrieb:
its a shame i cannot post the picture i took
Sorry. Read:
Or use a line-receiver if the oscillators is buffered internal.
- Henry
Michael Malloy schrieb:
its a shame i cannot post the picture i took is there any way to be
able to send my oscilloscope picture its 800k thats the problem
--
ehydra.dyndns.info
Hi Hal -
Thanks for your efforts!
I just settled down my GPS for the car on my desk (under a brick roof)
and left it over night alone. Between evening and morning I wrote 4
locations on paper and later dumped it into Google. So this is a test
case for ONE unit. It is a TomTom equipped with a
I molt them in a high-power charge-pump. The same with WIMA MKS.
At normal usage they will last forever and work even at low temperature
whereas normal Al caps won't.
- Henry
gary schrieb:
At sane temperatures, OSCONs are very good. Who runs their gear hot
enough to boil water?
Maybe the HC04 oscillates but the experimenter doesn't see it. Or
misunderstood that ICs have to be seen from top, not bottom like
transistors.
It is better to use an HCU04. Even a 4069UB should work at 8MHz@5V. I
would prefer 100K feedback and several stages AC-coupled.
The 5V is nominal,
Hi all!
I wonder what would be reasonable location accuracy if two cheap same
type GPS modules will be several meters apart? I understand that it
involves statistical numbers.
Any idea? Say for a small robot.
Thanks!
- Henry
--
ehydra.dyndns.info
Pricey, but allows to fly on high-attitude/speed. The region where money
ist not so important ;-)
- Henry
Poul-Henning Kamp schrieb:
Has any of you played with this:
http://www.sparkfun.com/products/8238
--
ehydra.dyndns.info
___
for position to increase the
position accuracy.
On Thu, Nov 24, 2011 at 1:01 PM, ehydra ehy...@arcor.de wrote:
Hi all!
I wonder what would be reasonable location accuracy if two cheap same type
GPS modules will be several meters apart? I understand that it involves
statistical numbers.
Any idea
li...@lazygranch.com schrieb:
The bozos at Broadcom have actually patented using shunt regulation in their chips. Good luck enforcing that patent.
Must be a joke or misunderstanding.
Look for example in the datasheet of TCA440. A really old IC. In the
internal circuit displayed is a diode
Hi Peter -
I sent you an off-list message but got no response.
Please contact me.
Thanks -
Henry
Peter Loron schrieb:
Hello, folks. I have several new-looking Vectron OCXO units. They output a
70MHz sine wave. Vectron wouldn't give me the data sheet for them, but I do
have the pinout.
If
Hi!
I'm reading on, so sorry for replying soon.
Magnus, what is the next good paper?
cheers -
Henry
Magnus Danielson schrieb:
This paper is however only scratches the surface on bandwidth/gain
analysis in balancing the added noise (per step) and added slew-rate
gain (per step).
--
Thanks Magnus!
I have no access to IEEE papers.
I read Bruce' pages already.
- Henry
Magnus Danielson schrieb:
Oh, do read the Oliver Collins The Design of Low Jitter Hard Limiters
IEEE transactions on Communications, Vol 44 No 5, May 1996 pp 601-608
Toss in this paper:
He he. For me Key West Florida is a synonym for status 'retired for fun'
or because career end (because already earned enough money for the rest
of life).
- Henry
Jim Lux schrieb:
However, another search does turn up:
Oliver Collins, who now lives in Key West, Florida, ...
So maybe he'd be
Hi Bruce -
Do you have a reference to read on for this?
Thanks -
Henry
Bruce Griffiths schrieb:
Sub picosecond jitter is feasible if one cascades a series of low pass
filtered limiter stages.
--
ehydra.dyndns.info
___
time-nuts mailing list --
Your algorithm looks very much like the solution to the problem how to
find divider values in a rf receiver having a very low IF and *not* full
length divider chains for dividing all the needed reference frequencies.
So how to find two values connected.
Interesting.
- Henry
--
That is maybe interesting to you:
http://www.holmea.demon.co.uk/Projects.htm#Frac
- Henry
--
ehydra.dyndns.info
Luis Cupido schrieb:
P.S. At the moment I'm testing on the bench with a real FPGA cyclone III
with a 48bit dds at 100MHz fclock and at circa 6 and 18MHz output and it
is not that
There get slower with falling current.
- Henry
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ehydra.dyndns.info
Hal Murray schrieb:
I was thinking about trying an orange or yellow LED here, and dimming the
LED with the series resistor, trying to make it as dim as the neon bulb, but
I don't know if a LED can be dimmed down that low.
Almost lost...
OK. In the meantime I worked on a project where I needed a doubled
frequency of a signal with gaps. I made a synchronous oscillator locking
on the double frequency. Works great and is as simple as thing can go.
It works by injection locking. Such a circuits shows a PLL
paul swed schrieb:
Other comment injection locking is always interesting to me because you can
inject at quite low frequencies. I would like to see some of the details
from Henry.
Here is a cut of a bigger circuit. Generates 10MHz from disturbed 10MHz
like a PSK transmitter. Or if you remove
Jim Lux schrieb:
The MEO height of GPS was a deliberate choice (again, that GPSWorld
series is a fascinating history of how it came about). Don't forget
that one of the original reasons for GPS was for doing midcourse
correction on ICBMs.
Where is this GPSWorld history located?
regard -
Thanks Jim!
Sorry for posting on time-nuts list with time-offset +1 ;-) corrected.
- Henry
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ehydra.dyndns.info
Jim Lux schrieb:
On 6/10/11 6:55 AM, ehydra wrote:
Jim Lux schrieb:
The MEO height of GPS was a deliberate choice (again, that GPSWorld
series is a fascinating history of how
That is the solution:
http://xkcd.com/162/
- Henry
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ehydra.dyndns.info
Tom Van Baak schrieb:
Hi Christopher,
Thanks for those interesting links.
Note PHK's original ACM article is:
http://queue.acm.org/detail.cfm?id=1967009
The recent IEEE mention is:
I prophet:
Chris Albertson schrieb:
I asked the question because I might want to build one of there but I
could not see how they could be table with just an RC filter. So the
answer is they just are.
Mixing generates two frequencies and a DC phase shift response.
If RC filtered you get the
It makes senses even for this list!
Numbers like 12 and 60 are chosen for their high number of dividers.
That is a mathematical reason. Think of in ancient time all was divided
in equal integers units. Even the Maya knew it!
This is connected to numbers of low n-divide with the ultimate of
For me it looks like this guy hates SI system. There are many out there.
How cares?
The problems arise if systems get mixed up and at least one end of the
communication link thinks the other does the same.
So left-right screws confusing between UK and Europe, satellites with
inch-meters
I don't think that SI is the last system we see and that is for the
decimal system too.
I see small problems like the definiton of mass as units of 1000xgrams
and that the k is low but should be K to be consistent (M, G, etc).
But to think the american system is better must be a joke. Even the
John Miles schrieb:
Sound cards will usually end up running within 1 Hz of the desired sampling
rate, but it's important to pick a sampling rate that's native to the
hardware, or the driver will resample the data. On Windows, many drivers
for popular sound cards rely on some imprecise
Try this direct link:
Yes Graham.
But we are intelligent, or?
Use a torrent.
Or a friendly hoster like bplaced.net
- Henry
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ehydra.dyndns.info
gandal...@aol.com schrieb:
I'm sorry to hear you continued to have problems and do not know quite
where you ended up.
As others have pointed out, Rapidshare,
All IE6 users pay YOU with time for nothing. Thanks!
- Henry
--
ehydra.dyndns.info
gandal...@aol.com schrieb:
In a message dated 12/03/2011 15:23:39 GMT Standard Time, ehy...@arcor.de
writes:
Yes Graham.
But we are intelligent, or?
Use a torrent.
Or a friendly hoster like
At the moment I design a Ethernet UDP-capable sound-card as a secondary
priority project in free-time.
I settled to the AD7641 but welcome any suggestions/additions if one is
interested.
The main app would be SpectrumLab.
cheers -
Henry
--
ehydra.dyndns.info
Tijd Dingen schrieb:
For that
or djvu:
http://any2djvu.djvuzone.org/djvu/110312/84.181.76.205/19469.110312152109.djvu
- Henry
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ehydra.dyndns.info
Rob Kimberley schrieb:
I've also just downloaded the slow version in 2.5 minutes. Seems damn
quick to me. This was with Firefox, which I prefer above all other browsers.
S/N drops spectacular!
Any probs to cut the noise-floor here? The text looks like art.
- Henry
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ehydra.dyndns.info
Bruce Griffiths schrieb:
Stephan Sandenbergh wrote:
Thanks,
I'm familiar with the designs you posted to measure voltage noise ect. on
you home page. These, with some
The exclusive solution feasible is:
http://shop-emea.u-blox.com/abashop?s=274p=productdetailsku=553
Nice, as you can program it for PPS at 10KHz or some other frequency.
More cheap, not so spectacular:
Cirrus CS2000 PLL
Locks on 50Hz or more
- Henry
--
ehydra.dyndns.info
Cezary Rozluski
If one can say that the actual noise-floor signal is approx. white noise
than the peak to average is a factor of 6 to 7 on a analog scope. I once
read this somewhere and found it not a so bad decision.
- Henry
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ehydra.dyndns.info
David C. Partridge schrieb:
H I wasn't impressed.
For me, this looks like a advertisement campaign only. Not very
sophisticated or ingenious. Read that you don't need LC-filters at the
output because of the LDOs. *lol* If the designer ever heard of corner
frequency??
And the ISL9000A is the same.
- Henry
--
ehydra.dyndns.info
David C.
Hi John and group -
For us germans, american magazines always look overloaded with
advertisments. The marketenders don't like to hear that the generations
under 40-50 are mostly advertisment blind just by natural adaption.
The times where I read paper electronics are long gone. The Internet
This is an alternative:
http://shop-emea.u-blox.com/abashop?s=274p=productdetailsku=553
Nice, as you can program it for PPS at 10KHz or some other frequency.
- Henry
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ehydra.dyndns.info
Rick Hambly (W2GPS) schrieb:
Every now and then I see e-mails like these. I would like to remind
Here:
http://www2.electronicproducts.com/Designing_an_ultra_low_noise_supply_for_analog_circuits-article-fapo_TI_mar2011-html.aspx
- Henry
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ehydra.dyndns.info
ewkeh...@aol.com schrieb:
There is an interesting article in the March 2011 Electronic Products
magazine design an ultra low noise
Spread-spectrum and similar schmes were a little kind of secret and
secure communication around 1970 where the mathematics where done in the
years before, beginning with the classic Shannon paper about information
theory. Many papers were classified to help protect the knowledge their.
A circuit design? Look for 96MHz variants. Many out there.
Example:
http://www.qsl.net/dk1ag/96mhz_e.pdf
- Henry
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ehydra.dyndns.info
ewkeh...@aol.com schrieb:
As part of the D/M project the counter uses a 100 MHz VCO with an AD 4001
PLL. To simplify further I would like to consider a
Hm. Concerning the CS2x00. Is there a PC software available to program
it via i2c? I mean without this IDT monster software.
Any hint is welcome!
- Henry
ewkeh...@aol.com schrieb:
Thanks for the info Fred
The problem is the package. Looking at the Cirrus Logic CS 2300-CP and
use
a
shaper for pulses in an if-strip.
I tested different ideas with schottky-diodes somewhere in the if-strip.
In the end, I must say that leaving such out of the design is simply the
best.
Any comments?
- Henry
ehydra schrieb:
Hi Magnus -
Well. I made homework for sure. Endless viewed
Hi all!
I friend of mine wants to construct an experiment for students for
studying random walk noise.
What is the best good available transistor or other parts? All parts he
tested where just to good.
Thank you!
- Henry
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ehydra.dyndns.info
I think the confusion is now perfect:
http://www.mikrocontroller.net/topic/207061#2059725
Let Google translate it from german to your language.
Does the difference come from voltage vs. power spectrum?
Magnus Danielson schrieb:
On 12/02/11 21:02, Bruce Griffiths wrote:
Flicker noise is not
LeCroy has a paper with a short explanation that I found useful:
http://www.lecroy.com/files/WhitePapers/WP_TechBrief_Var_of_Time.pdf
This look to me very similar to this:
http://pstca.com/sampler/index.htm
- Henry
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ehydra.dyndns.info
___
SpectrumLab uses the Goertzel-Algorithm to trim the time reference to
the millisecond range. Maybe that is comparable and as algoritm
transverable?
- Henry
J. L. Trantham schrieb:
DFT? Direct Fourier Transform?
Thanks,
Joe
-Original Message-
From: time-nuts-boun...@febo.com
I suggest to ask LTC first for what is required. Personally I think one
of the clock multipliers for SONET etc should be enough. silabs have
several parts, others too.
If I remember correctly, I've seen a App Note describing oscillator
requirements at LTC website.
- Henry
Elio Corbolante
I'm not sure if I overview the problem correctly. Hm, why not run the
cable back and measure the round time? Half this time und you know the
delay of one way. Then you can shift this with a PLL away.
A similar scheme is used in almost all modern PC clock distribution
chips. A bunch of PLLs on
Hi Magnus -
Well. I made homework for sure. Endless viewed websites what others had
done.
We all seek for the singularity of beauty in our art. At the moment this
is a CD4007 or similar without AGC. Cheap, effective. Not oversized. I
came from TCA440. One of the not many receiver chips where
I don't know how good it has to be but have you considered the Si570 or
even one of the bigger more power hungry candidates from silabs?
Really easy to drive this chip!
- Henry
Luis Cupido schrieb:
Jim, Bob, Henry, Brian,
Thanks to all.
Very good.
yeap, I do work on matlab so I think there
Magnus Danielson schrieb:
Hi,
On 27/01/11 01:30, ehydra wrote:
Hm Magnus -
I heard of it as a standard text book but never looked inside. And not
known that it describes limiter behaviour.
Anyway. Now I have a version of 2004, 3rd edition, and cannot find the
mentioned chapter. Please post
The best once I found is this:
http://www.holmea.demon.co.uk/FracN/Simulate.htm
- Henry
Luis Cupido schrieb:
Hi,
Is there a DDS spur prediction software around ?
I mean for an arbitrary DDS design, like I would
implement with logic or fpga etc.
A code where I can enter nr of bits adc bits
Thermal energy in metals are measured in 'pro kg'. The rest is just
calculation.
From a practical standpoint I would use copper. You can solder and weld
it more easely.
Look for how head-fin spreaders work for CPUs.
- Henry
Perry Sandeen schrieb:
List,
Please help me with this physics
Magnus Danielson schrieb:
On 27/01/11 20:19, ehydra wrote:
I found chapter Appendix 7A Analysis of interference in a hard limiter
There is a half page with a couple of formulas. Not much, not
practically oriented. Only idealized hard-limiters.
I'm interested in SOFT-limiters!
Jim's problem
Yes, it depends. Sometimes noise lowers SNR, sometimes it improves.
A similar scheme exists to improve ADC performance. If I remember it
correctly, LTC owns a patent where they inject pseudo-noise with known
properties, then the signal runs thru the ADC, then 'a picture of' the
added input
Hi Bob -
Yes. But coming back to the CMOS inverter multi-stage amplifier:
Because of the absolute momentum signal level the first stages
(=amplifier) sees it operates more linear than later more saturating stages.
As long as the single one stage works linear, this stage will not change
the
Hi Magnus -
What book? This one maybe:
Gardner F M PHASELOCK TECHNIQUES Wiley Sons 1966
- Henry
Magnus Danielson schrieb:
It goes towards sine as I recall it. The gaussian noise rubs of
overtones. Gardner describes this in his PLL book. Setting up a nice
sawtooth detector is no good when
The classical approach is to heavily band-limit the input of an
following hard-limiter. But would it possible to merge both functions in
several stages of an IF-strip?
I think most individuals cannot follow much of this idea but time-nuts
have the same problem :-)
My main interest is a
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