Driver to drive?

Denis Gleeson wrote:
Hello all

What are the capabilities of GSM when it comes to Fax transmission.
I have seen PSTN to GSM boxes that do FAX transmission.

This one
http://www.sagem.com/en/produits-en/systemes-radiocom-en/rt3000-en.htm
does Analog G3 fax:9600bps.

SO I assume we can connect the PSTN connection coming from our fax
machine
to the input of this device.

This seems to be a special capability of GSM where it appears the
Analog data from the fax machine is only digitised before transmission
as opposed to going through a voice codec as would normally happen.

Can someone enlighten me on this or point me at details in standards
etc.

Many thanks for all replies.

Denis
I've sent fax with my mobile, using infrared.... cant recive tho
 
"Robert Baer" <robertbaer@access4less.net> wrote in message
news:41638894.50804@access4less.net...
Ken Smith wrote:

Do you know of any way to protect a signal output line against some
idiot
connecting it to 440AC or 600VDC yet meeting the following:
Shoot all known idiots? it does sound like a very silly thing todo.

Colin =^.^=
 
On Mon, 4 Oct 2004 11:15:38 +0100, John Woodgate <jmw@jmwa.demon.contraspam.yuk>
wrote:

I haven't looked. But by what I read, it's indescribable. (;-)
Oh, well my thoughts *can* be described. Just vote for all you want to vote for
and don't vote for those you don't want. Winner is the one with the most
affirming votes. See? Easy.

Works pretty well even in imperfect voting systems, like punch cards with
difficult to find tiny holes on small rows. If you accidentally punch out a
hole for some choice you DON'T want and you don't really know how to "fix it"
then just take a further moment to punch out the one you *DO* want and don't
even bother fixing the other hole you wished you didn't punch. At least you got
in the vote you wanted, even if you also threw a vote to the choice you didn't
want. It's half-good, at least, even when you've messed things up and have no
idea how to properly repair it. But at least your affirming vote gets counted,
rather than the whole thing thrown out. And if you know how to repair it,
you're even better off.

The system works much better at measuring choice when used correctly and it
still works better when used incorrectly, as well. Trivial to explain, trivial
to use, and you vote sincerely because you don't need to 'strategize' about how
others might be voting.

Do you recall web pages set up in the US to trade votes in solid one-way states
with votes in states that were marginal? Have you heard lately about "moving to
marginal states" in order to influence the outcome? Have you heard about people
wondering if they should vote for Nader, even when he is their true preference,
because their state is one of the marginal ones and "throwing their vote to
Nader" might get Bush elected?

All that becomes unnecessary to even worry about when you get to vote for all
those you approve of and withhold your vote for those you don't. US citizens
could vote for both Nader *and* Kerry, for example, and withhold their vote for
Bush. Or others might vote for Bush and for some other alternate candidates
they approved of, without worrying about impacting their support for Bush.

In other words, folks could vote honestly. Good thing, in my mind.

Jon
 
"Wouter van Ooijen (www.voti.nl)" <wouter@voti.nl> wrote in message
news:4163cc8f.96108046@news.xs4all.nl...
I am confused about the edge on which a FF triggers. My intuition
would say that any logic symbol with a plain wedgie (no inverting
blob) should trigger on the positive edge, but maybe that's too
simple.

H&H 2nd edition P508/509 states that a JK triggers on the negative
edge, and an edge-triggered FF on the positive edge. But it is not
clear whether that refers to the implementation as shown, or to thje
bare logic symbol. Most JK symbols do have the inverting blob on the
clock input.

P510 suggests that both dividers behave the same, which would imply
that the plain JK symbol triggers on the negative edge,

Yet P511 states that the shown ripple divider clocks on the negative
edge, the JK symbols do have the inverting blob, so the plain JK
symbol would clock on the positive edge.

My tenative conclusion is that a plain (no inverting blob) D FF clocks
on the positive edge. But on which edge clocks a plain JK FF?
Positive, neative, or worse: there is no standard?
heres my 2 pence worth

positve logic = positive edge
negative logic = negative edge ie with blobs or wedges
dont care logic = could be any edge .. who knows ??

master-slave jk fip flops latch the jk state on one edge then transfer it to
the output on the next edge, maybe that cuases more confusion?

Colin =^.^=
 
Wouter van Ooijen (www.voti.nl) wrote:
I am confused about the edge on which a FF triggers. My intuition
would say that any logic symbol with a plain wedgie (no inverting
blob) should trigger on the positive edge, but maybe that's too
simple.
Not everyone uses "intentional" logic symbols- a lot of people leave the
wedgies out on circuit diagrams, and don't necessarily add circles to
active-low inputs or mark the name with a negation. the 74x73 triggers
on falling edge, the x74 on the rising edge, but without going through
the books I can't remember whether that's true for all other Ds, JKs
etc. I suppose it's up to the chip designer and what they think people want.

My tenative conclusion is that a plain (no inverting blob) D FF clocks
on the positive edge. But on which edge clocks a plain JK FF?
Positive, neative, or worse: there is no standard?
Sadly, there's no alternative to reading the data sheet for each type.

Paul Burke
 
Ken Smith wrote...
... Some of you may not remember that Siliconix made a 2N4867A that
was a very low noise JFET. It was, I believe, a selected 2N4867 part.
That was in a TO-18 package, far too expensive to compete in the
long haul. Siliconix sent us to their J201 series for TO-92 and
SST201 series for sot-23 versions of the die, which they still make.

I just designed in the 600V PTC circuit breaker from BC components.
You can guess what I just found out today. Thats right, Vishay
bought BC components and are cancelling that product line.
Surely there are other suitable PTC manufacturers? Raychem's patents
expired a few years back, didn't they? Schurter, Bourns, Littlefuse,
Cooper Bussman, etc. And the pacific-rim companies listed on the
Global Sources website, like Fuzetec, Jenn Feng, Electric, Shenzhen
Sunzone, Dongguan Richwell, Photosphere (Photo-Top), Sinyork, TOA,
Jya-Nay, and Supertech.

Do none of these make 600V fuses? What about Fuzetec Technology's
FRH160-600, plus a trip relay, to keep the exposure time short?


--
Thanks,
- Win

(email: use hill_at_rowland-dotties-org for now)
 
Spehro Pefhany <speffSNIP@interlogDOTyou.knowwhat> wrote:

On Tue, 05 Oct 2004 17:25:32 -0700, the renowned John Larkin
jjlarkin@highSNIPlandTHIStechPLEASEnology.com> wrote:

On Tue, 05 Oct 2004 19:25:21 -0400, Spehro Pefhany
speffSNIP@interlogDOTyou.knowwhat> wrote:

On 5 Oct 2004 15:11:57 -0700, the renowned Winfield Hill
Winfield_member@newsguy.com> wrote:

ChrisGibboGibson wrote...

Spehro Pefhany wrote:

Doesn't take much leakage across the capacitor or current source to
reduce the linearity at midscale down to the 12-bit level though.

I might have known you'd spot the flaw!

Some leakage, but dielectric absorption is usually more damaging.

It is reduced to an offset error when you do serial single-slope
conversion.



Is it? The DA model is additional series R-C circuits across the main
cap. If the time constants are longer than the ramp time, that
obviously reduces to a shunt resistor, so will curve the ramp down.
The parasitic tau would have to be much shorter than the ramp time to
not bow the ramp, in which case it's just a small shunt cap, so is
basicly invisible.

ESR would cause a DC offset.

Does that make sense?

Yes, it does. A similar claim was in the National AN, and I don't
think it can be accurate.
Years and years ago I wrote the software which controlled a precision dual
slope auto calibrating auto zeroing converter. Memory is pretty hazy but I
think the main problem with DA on the integrating capacitor was an error
which depended on the height of the ramps in previous conversions.

The single slope auto calibrating converter discussed in this thread can
avoid this type of error by ensuring the ramps run on a constant time base
and stop at the same height. DA errors are then repeatable and probably
look like a slight offset and slight ramp non-linearity.
 
nospam wrote...
... I think the main problem with DA on the integrating capacitor was an
error which depended on the height of the ramps in previous conversions.
Hmm, sounds like dielectric absorption.


--
Thanks,
- Win

(email: use hill_at_rowland-dotties-org for now)
 
On Wed, 6 Oct 2004 01:49:11 -0400, "Robert Morein"
<nowhere@nowhere.com> wrote:

"John Woodgate" <jmw@jmwa.demon.contraspam.yuk> wrote in message
news:mFfMHMBKz3YBFwq3@jmwa.demon.co.uk...
clip
On the other hand,
explosive rupture of a battery pack close to the abdomen could,
concievably, be lethal.

Yes, but the probability is probably lower than that of being fatally
kicked by a horse.
--
The two probabilities are not in the same universe of discourse because I
don't ride horses. OTOH, I am in close proximity with lithium packs.
I am pretty sure John assumed you don't ride horses when he assigned
the lower probability to the exploding battery pack. All computer
lithium battery packs include a thermal fuse in direct contact with
one or more cells, so a cell explosion requires multiple simultaneous
failures including at least a low impedance short across the battery
and thermal fuse failure. I have never heard of even a single
occurrence of laptop battery pack explosion, and there are a lot of
them out there. On the other hand, I know several people who have
been kicked by horses :).
 
Marco wrote:

Hi to all,
in my research activities I need a suitable VCO working in the
frequency range between 1MHz - 200MHz.
Please, let me know what IC can be useful to this purpose.
VCOs have usually only an octave band, or a bit less.
If you need 1 to 200MHz, you have several possibilities :

take a higher band which is 200MHz wide and mix it down,
such as 1000 to 1200MHz.
Or switch several VCOs,
Or use a DDS.

What is the application ?

Rene
--
Ing.Buero R.Tschaggelar - http://www.ibrtses.com
& commercial newsgroups - http://www.talkto.net
 
On 6 Oct 2004 04:38:37 -0700, the renowned Winfield Hill
<Winfield_member@newsguy.com> wrote:

Ken Smith wrote...

... Some of you may not remember that Siliconix made a 2N4867A that
was a very low noise JFET. It was, I believe, a selected 2N4867 part.

That was in a TO-18 package, far too expensive to compete in the
long haul. Siliconix sent us to their J201 series for TO-92 and
SST201 series for sot-23 versions of the die, which they still make.

I just designed in the 600V PTC circuit breaker from BC components.
You can guess what I just found out today. Thats right, Vishay
bought BC components and are cancelling that product line.

Surely there are other suitable PTC manufacturers? Raychem's patents
expired a few years back, didn't they? Schurter, Bourns, Littlefuse,
Cooper Bussman, etc. And the pacific-rim companies listed on the
Global Sources website, like Fuzetec, Jenn Feng, Electric, Shenzhen
Sunzone, Dongguan Richwell, Photosphere (Photo-Top), Sinyork, TOA,
Jya-Nay, and Supertech.

Do none of these make 600V fuses? What about Fuzetec Technology's
FRH160-600, plus a trip relay, to keep the exposure time short?
The 600V-rating units are very new. If someone does come up with
another source, please post it.


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
 
On 6 Oct 2004 05:09:21 -0700, the renowned Winfield Hill
<Winfield_member@newsguy.com> wrote:

nospam wrote...

... I think the main problem with DA on the integrating capacitor was an
error which depended on the height of the ramps in previous conversions.

Hmm, sounds like dielectric absorption.
Hence the term DA? Need coffee, Win? ;-)


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
 
Spehro Pefhany wrote:

On Wed, 06 Oct 2004 12:43:49 +0100, the renowned nospam
nospam@nospam.invalid> wrote:


Years and years ago I wrote the software which controlled a precision dual
slope auto calibrating auto zeroing converter. Memory is pretty hazy but I
think the main problem with DA on the integrating capacitor was an error
which depended on the height of the ramps in previous conversions.

The single slope auto calibrating converter discussed in this thread can
avoid this type of error by ensuring the ramps run on a constant time base
and stop at the same height. DA errors are then repeatable and probably
look like a slight offset and slight ramp non-linearity.

Yes, that's part of it- keeping the voltage pattern on the capacitor
the same every cycle. I was unable to detect significant (worse than
0.1% in this case) linearity error in single slope converters using
cheap (high-DA) polyester capacitors and a really simple current
source. I think the current source was actually the limiting factor,
but spending more than 2-3 cents would have fixed that.
Well I seem to have the CC good enough now (thanks Fred). What type of cap
would you recommend that has low DA ?

As you'll see from another post this all makes perfect sense now with regard to
the height of the ramp makes such a huge difference to readings.

Gibbo
 
"Wouter van Ooijen (www.voti.nl)" <wouter@voti.nl> wrote in message
news:4163d4bb.98200124@news.xs4all.nl...
master-slave jk fip flops latch the jk state on one edge then transfer it
to
the output on the next edge, maybe that cuases more confusion?

That is what a fellow teacher told me, but from my memory (and from
the implementation shown in HH p508) this is not true: a MS-JK latches
the input state on one *level* of the clock, and transfers it to the
output on the other level. The total effect is sample-and-transfer on
the edge.
Yes thats a more corect way of describing it, been a while since i looked at
one in detail. All the new symbols actualy leave out the inner workings
these days i had to just look at an old 1980 TTL data book to see an
internal schematic to check.

Colin =^.^=
 
xray wrote:
On Wed, 06 Oct 2004 03:00:23 GMT, xray <notreally@hotmail.invalid
wrote:


If your considering moving, pack your bags.


Oh, and I forgot to criticize you're grammar.
Hahaa- there's that "your" for "you're" substitution error that was such
a signature of RogerGT....
 
Phil Hobbs <pcdhSpamMeSenseless@us.ibm.com> writes:

The underwater cable has a relatively huge capacitance, which thieves
current-carrying capacity ('ampacity' in US-speak) from the feeder if
a.c. is used. For d.c., you just turn the power on VERY carefully.
While not an issue in the Channel; I seem to recall AC cables are
attacked by sharks far more often; the H field annoys them.

--
A host is a host from coast to coast.................wb8foz@nrk.com
& no one will talk to a host that's close........[v].(301) 56-LINUX
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433
 
"ftls1@uaf.edu" wrote:
... this oscilloscope could obtain a dynamic IP
address, which is private IP address. This is the
first step, next I must tell this IP and MAC to
the administrator to get a new IP address.
Here is the problem:
I must know the MAC or physical address because in
my area the network administrator only assigns IP
address combined with MAC address.
1) Your admin can find this information by looking at the current IP
assignment in his DHCP server; the MAC address will be listed there.
This is likely the same system where he will assign your IP address.

2) Your admin can look at the router's ARP table for the current IP
address.

3) You can ping the device from your PC and then issue the command 'arp
-a' on your PC (this must be done from the same IP subnet / block to get
the right MAC address).
 
On Tuesday 05 October 2004 02:04 pm, slawc did deign to grace us with the
following:

John Woodgate wrote:

I read in sci.electronics.design that Rich Grise <null@example.net
wrote (in <pIz8d.4727$Sl2.2910@trnddc09>) about 'What does J-K in J-K
flip flop indicate?', on Tue, 5 Oct 2004:


I was assuming that the "R" was "Reset" and the "S" was "Set." But what
could "J" and "K" stand for? :)


Jog and Kick, of course. What do you think Q and Q-bar stand for? And
the D in D-type and the T in T-type.


Jump, Kill
Delay
Data

Quantity. ;-)

Cheers!
Rich
 
On 4 Oct 2004 13:38:48 -0700, Prasad wrote:

Hi,
In case of all other flip flops ,the names indicate something about their function.
R-S:Reset-Set
T:toggle
D-delay or data

then what does j-k in j-k flip flop indicate.
reply me if u know anything about this.
Here's a post from Max Hauser (search for J-K):

http://groups.google.com/groups?selm=100ukpt83k5aq79%40corp.supernews.com&output=gplain

This version seems somewhat more likely that the oft-reported but
unsupported claim that they stand for Jack Kilby.

-- Mike --
 
Roger Hamlett wrote:

"boki" <bokiteam@ms21.hinet.net> wrote in message
news:4c3c095a.0410060345.7b4ea413@posting.google.com...
Dear All,
I am trying to scan RS232 output (TX) signal by an
oscilloscope.

When I short my RS232 output pin.2(TX) & pin.3(RX), it function
work ( sometimes lost some words, at least it sent signals).

When I connect RS-232 TX to oscilloscope, connect oscilloscope
ground to pin.1(Earth ground) or pin.7(GND logical ground),
oscilloscope both never has signals. If I 'short' RS-232 pin.2(TX)
and pin.3(RX), it works!

Why?


Thank you very much for your answer.

Best regards,
Boki.
Because you are using the wrong pin?...
RS232 equipment, can either be 'data terminal' equipment (things like
PC's), or 'data communication' equipment (Modems etc.). These have the
receive data, and transmit data pins swapped over, as well as the
handshake lines. Hence a piece of DC equipment, could connect
directly to a piece of DT equipment, without needing a 'null modem'
(which swaps the pins over). Connecting two DTE units together,
required either a real modem, or a null modem to give the crossover.
I'd suspect the kit you are trying has the data lines swapped,
relative to what you expect, and that TXD, is on pin 3.

Best Wishes
you connect rx and tx together and it works in your app?
ok, to display that on a scope you need to connect the sope ground to
pin 7 of the RS232 plug. but make sure the scope ground and the RS232
ground dont have too much of a diference. ideally shoud be the same
potential.
 

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