Pete
Thanks for the link. Now it explains where they come from and what
condition they are in. Again I like to warn against ggg*fitting that sell
Morion
as NEW and did sell FE 5680A as NEW. I did mail my very used sold as NEW
back to them so someone will get it if you continue to buy from t
Magnus
My beef is that if you advertise NEW it should be NEW. I caught him once
before and ebay made him change the listing. This time he had two listings
one new and one used. I checked with him and paid extra for NEW and got the
most banged up unit ever. All from the same stack. Finally got
Roberto
It is called tens of years of experience
Bert Kehren
In a message dated 2/27/2012 5:16:28 A.M. Eastern Standard Time,
rbarri...@msn.com writes:
Hi Bob,
I wonder what the other oscillators that others are receiving look like in
the SA. Replacing all the capacitors would take a seri
Don
Thank you bought 2
Bert
In a message dated 2/29/2012 4:45:08 P.M. Eastern Standard Time,
d...@montana.com writes:
Dunno if you have seen this on ebay:
260967834514
It's an AD9850 with a 125 MHz crystal mounted up on a .1 spacing board
with pins, for about $8 free shipping from the Old
You have not said any thing as to what you expect to get out of the DDS
and how important certain parameters are. We recently did a AD 9913 that Tom
tested extensively http://www.leapsecond.com/pages/ad9913/ using a single
supply for the DDS. Some may take exception but it works for us. The
Correction I did put pin 4 on the same regulator as the PIC. Had to have
one for the PIC so why not use it. Do not know if it made a difference.
Bert
In a message dated 3/16/2014 3:58:20 P.M. Eastern Daylight Time,
ewkeh...@aol.com writes:
You have not said any thing as to what you expect
Quite a few time nuts have Rb GPSDRb's running using Shera's controller. I
did mine in 1999 with the help of Brooks and Corby and my first FRK died on
Shrea's controller after 24 years of service. Bad lamp.
Have to measure C field sensitivity just like on an OCXO and increasing
sample time fr
Depends on what you call close. 1 E-14 steps are very doable. That does not
mean that that is the accuracy because once you go below 1 E-12 you have
to worry about barometric pressure and humidity assuming you already have
temperature control.
Bert
In a message dated 3/21/2014 2:58:32 P.M
Some use DAC's some use DDS' the FE 5680 uses a DDS.
Bert Kehren
In a message dated 3/21/2014 3:17:12 P.M. Eastern Daylight Time,
hmur...@megapathdsl.net writes:
albertson.ch...@gmail.com said:
> There seem to be two different class of Rb. One takes an EFC just like
the
> OCXO so the co
Paul
Do not understand your question, what do you mean with tight?
Bert Kehren
In a message dated 3/21/2014 3:22:41 P.M. Eastern Daylight Time,
paulsw...@gmail.com writes:
Hal
Actually now that you mention it was the DDS chip.
Bert
I agree with your comments. How tight can it be.
Thanks
Hi
There are many issues when it comes to a GPSO. But what has to be first
discussed what is it one wants to accomplish. Last year when we worked on the
latest Shera GPSDO we always got better than 1E-11 with a unit lying on
the bench with no enclosure or thermal management.
Chasing elusive
The lowest cost solution is a DS chip in combination with a PIC. How ever
has any one thought about a fix by going to the source of the problem. The
TCXO. Use a DDS with internal multiplier like the AD9851 or AD 9913 and use
the sawtooth message from the GRS receiver and change the frequency.
Yes if you want to use it only in a GPSDO and it is being done but if you
are a time nut you may want the 1 PPS..
Bert Kehren
In a message dated 3/25/2014 6:33:12 P.M. Eastern Daylight Time,
albertson.ch...@gmail.com writes:
On Tue, Mar 25, 2014 at 5:44 AM, wrote:
>
> The lowest cost so
All Rb's have XO's and with the exception of the HP5065C all Rb's influence
long term stability only the only exception is the HP which uses a TC
below 0.1.sec, and as Corbe demonstrated ADEV is controlled below 1 sec. by
the
cell. The same can not be said with other Rb's.
Bert Kehren
In
The QEX unit is a spin off of the Shera, how ever the DAC is only 12 bits
covering the full tuning range of the Rb. Shera does it better with 18 bits
and has additional features. I would not spend the money to get a copy.
Bert Kehren
In a message dated 3/28/2014 2:42:55 P.M. Eastern Dayligh
Am experimenting with small low cost GPS antennas and am considering as an
alternative RTV/silicon. Any information on RF attenuation of RTV/silicon
at 1.6 GHz ?
Bert Kehren
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time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https:
The Gerber Baby Food Jar at Wall Mart $ 0.49
In a message dated 4/15/2014 1:03:40 P.M. Eastern Daylight Time,
jim...@earthlink.net writes:
On 4/15/14, 8:13 AM, ewkeh...@aol.com wrote:
> Working off list on a super high performance GPSDO but low cost thanks
to a
> time nut (sorry forgo
Having five GPSDO's running and some for over 14 years I have a very
sophisticated and expensive antenna system. This is part of a project that with
the disappearance of Tbolts and other commercial GPSDO's to make available
to time nuts state of the art performance at an affordable price,
s
Washed all three down the sink
Bert Kehren
In a message dated 4/15/2014 3:18:34 P.M. Eastern Daylight Time,
jim...@earthlink.net writes:
On 4/15/14, 11:02 AM, ewkeh...@aol.com wrote:
> The Gerber Baby Food Jar at Wall Mart $ 0.49
>
Is there a particular kind of food that works best? Perha
Having done extensive testing on the ublox 6M that you can buy with antenna
for less than $ 23 new from DX.com I can say with certainty that the 1 Hz
pulse is better than 1 E-9 accurate, closer to E-10. Depending on the
counter it could be used to adjust a frequency counter to that accuracy.
Chris
I am not sure if you want to measure temperature or control a fan. To
measure there are many options depending on how much money you want to spend.
To control I suggest either a LM 335 or a NTC resistor. I have worked
extensively with both and for measuring I have now downsized to a YSI
The thunderbolt is one of the best timing devices but not for frequency, if
you want high resolution. Over time it is ok but high resolution short
gate times and you see the frequency changes. They use the OCXO to correct for
timing error and if you have a Tracor 527E you can see it. Also how
And quite a few companies use them.
In a message dated 4/26/2014 8:27:57 P.M. Eastern Daylight Time,
li...@rtty.us writes:
Hi
There are a number of timing receivers on the market. They still are a
very small percentage of the total units sold. A lot of people play with the
uBlox parts.
Looks like they are doing exactly what I suggested as one of the
alternatives for saw tooth correction. They have a VCTCXO in the module, with
the
computing power in their chip a no brainer. the question is how much will it
cost and how important will it be for a GPSDO. Final cost at maximum
Welcome to the nuts Tony
You are not specifying exactly how accurate time has to be but in my book
and based on tests the most reasonable priced GPS with 1 pps is a Ublox 6M
that you can get with antenna for less than $ 22 antenna included from
_www.DX.com_ (http://www.DX.com) . They have volu
I am not advertising for DX but I have bought 4 with good results and their
units have a 5 V regulator on it. Some have even a TTL to RS converter on
board.
Bert Kehren
In a message dated 5/2/2014 11:40:47 P.M. Eastern Daylight Time,
tn...@toneh.demon.co.uk writes:
On 03/05/2014 00:59,
Tony
There seem to be many variables. Cost, power, how many, overall stability
etc. Most likely you will find that the GPS module is not the most expensive
part but the VCXO. It also makes a large difference if it is one off or a
larger volume is needed. You can always find a bargain, and ma
The original price of the STEL1173CL was $ 125 in quantity 10 so $ 65 is a
bargain. I have no idea as to how it is used in the 4065A but if it is
limited to 13 frequencies it may be worth wile to take a look at the AD 9913
it is capable to produce very precise frequencies exceeding its 32 bi
Traced the problem of my FTS 1200 to the first BC109 Transistor on the
A2/A3 AGS/Amplifier board. Since it is right after the Oscillator transistor
low noise is critical. This unit is at least 30 years old and my question is,
what transistor will have even lower noise than the than low noise
Thanks for all the help. I do have a couple of BC 109 but I thought with
all the work to carefully disassemble the unit that after 30 years there
would be a better transistor.
Thanks again
Bert Kehren
In a message dated 5/17/2014 6:47:55 P.M. Eastern Daylight Time,
csteinm...@yandex.com w
Joe
I am German living in the US. The site does ship to the US and once the
product is available middle June If necessary I will be glad to help.
How ever we have time nuts living in Germany and some probably have bought
from this site. They can log in and find out what then payment options
a
I think there is confusion between where there is a negative delay. Yes the
M12 can have a negative value but in order to correct for the full range
of the saw tooth at zero the DS chip has to add 128 nsec delay plus the zero
value. Depending on the message it ads or subtracts from that value
The question is what is the definition on time. Yes it will be always 140
nsec late to what the M12 calls zero. Good for a GPSDO. How ever if you want
it to relate to NIST time more hardware is needed unless you can
compensate that 140 nsec in antenna delay.
A simple solution would be a prese
This may be off topic but I did check with Tom and many time nuts may have
HP E3610A power supplies on their bench and mine smoked a ublox GPS so that
makes it topic related..
The reference section has some 1 uF 50V capacitors and in my unit one
shorted. The reference section has fuses on the
Brooke NO
Bert
In a message dated 5/22/2014 3:12:56 P.M. Eastern Daylight Time,
bro...@pacific.net writes:
Hi Bert:
My E3617A has a front panel adjustment screw for Over Voltage Protection.
Does the E3610 have that?
http://www.prc68.com/I/Capacitors.shtml#SupCMeas
Have Fun,
Brooke Cl
Having used lately ublox 6M for GPSDO work I decided to buy a couple of MAX
7C's on ebay for $ 16.00 181293242043
Super results. We are going to do some saw tooth analysis but most likely
will not post them because the deterioration of the list has resulted in
many on the real time nuts
Don
I will continue to be part of the list but am frustrated with the loss of
some of the best we used to have and I do not consider my self one of them,
but I learned immensely from then. I am not the only one with that opinion
looking at the number of responses I am getting.
I do not know
There have been a couple of questions on and off list. as to the specific
listing. I did forget to mention one thing. The unit comes with a built in
antenna. For time application not exactly what we want Not easy to take
off since it is a block of ceramic with a pin through the center with l
Paul we need to talk about 405 many things happening. I will be out from 11
till 3 otherwise at home.
Bert
In a message dated 6/18/2014 10:41:32 P.M. Eastern Daylight Time,
paulsw...@gmail.com writes:
Bert just finding out that google mail is treating your emails as spam!
Not sure if the
Tom
I am not concerned having followed the discussions lets see what comes from
it. Based on the response, we will have our hands full.
Let me make clear I take credit for instigating it but it involved five
people that at this time have chosen not to be mentioned.
Bert.
In a message d
It is a shock and a loss not just to time nuts but many others that where
touched and benefited from him.
Like in the case of Brooks I know what I will do and I urge those of you
that knew him through any type of contact make the old fashioned proper thing
by sending his wife a letter or card
The response has been very positive such that a $ 45 kit is doable. Working
on getting at least two beta tests lined up.
However it is disappointing that no one has stepped up to tackle the
temperature problem. how many have looked at the temperature attachment and
clicked on the N5TNL link.
Again we are talking past each other I am talking about temperature
compensation with the DDS that ideally should be removed. Those steps upset
any
loop.
Bert
In a message dated 6/24/2014 6:38:48 P.M. Eastern Daylight Time,
hol...@hotmail.com writes:
Check out the temperature control c
Lets be clear the 1 E-13 is a totally different project and does not relate
to the FE 5680 A. Yes most likely we will use the same universal
controller but with different code, same board. GPS crosses the 1 E-13 line at
10 seconds little more than a day. I whish it was just temperature a
We use NTC 10K with the FRK. Precision is not important.We have to play
with the settings in order to have fan starting voltage over the full temp.
range.
Bert Kehren
In a message dated 6/24/2014 8:12:45 P.M. Eastern Daylight Time,
shali...@gmail.com writes:
After having tried just abou
I probably should have called it more correctly frequency control. Thanks
to the help from Scott N5TNL we clearly where able to watch the DDS as fan
cooling was added and removed from the Rb. Only a small change resulted in
the DDS tuning word changing by 89 which is a frequency change of 6
Because the 96K attachment needs moderator approval I am sending it again
without attachment. It is the one I posted before and shows clearly the
frequency jumps. So here is the rest of it.
Magnus
Sorry but I disagree with your statement. First and foremost we have to
accept that these devi
Thanks Bob for putting it in perspective, 0.05 C is very doable, looks like
it is also used in some OCXO's.
Bert Kehren
PS on a related subject I just pulled PROCEEDINGS OF THE ANNUAL SYMPOSIUM
ON FREQUENCY CONLTROL ATLANTIC CITY in the late 70's did attend a few
because of my involvement in
I can only answer some of your questions. The tuning word is modified by
the temperature but if it came back to the same oven current it will again
have the same tuning word to the DDS.
Since we have not fount a temperature sensor they most likely use oven
current that Bob mentioned.
If you d
Will someone beside us use heat pipe. Would love to have an impendent
input. What does it take to get a test going. Scott has done a lot of work, how
about some one else step up to the plate. There are a lot of time nuts out
there with the 5680A,many for the first time will have a very good
If at least those that directly profited from his work would agree to send
an old fashioned Condolence letter I will be willing to send a more
comprehensive letter but not ask for any thing. Again may open some doors. They
would not be able to overlook the global inflow of letters and be mad
After talking with Hartmut off list and finding out that no family lives
close by I decided to send this letter shown below in German, hand written
on German condolence stationary to his neighbor and friend. The English
translation is below.
Sehr geehrte Herr Hackfeld,
Als Erstes möchte i
First let me thank again Scott Newell for all the work he has done. The
links included in this post where made possible by Scott. All three exceed
the limit of time nuts but will give you a better understanding as to what is
going on. First removing the 10 K resistor changes the Rb frequency
Some how a dot snuck in at the end of the second link after the s you can
use the old link and delete the dot or use this one
http://n5tnl.com/time/fe-5680a/gpsdo/JK5680A_Test35c.xls
Sorry about that
Bert Kehren
___
time-nuts mailing list -- time-nuts@
Good Morning Angus
Let me start out by saying the FE5680A project was intended for time nuts
and the unit will not be part of our bench, so the work on it is limited. As
far as Rb's are concerned our focus is on FRK and HP5065. Looking back I
would most likely not suggested it, had I known ho
In the seventies I did for some friends that had FCC First class licenses a
counter that on the input had three J/K F/F's to subtract the IF from the
LO. They modified receivers including running the IF in to saturation and
they certified stations without going there.. I think measurements ha
As part of the FE 405 B project a separate output circuit is in the works.
The universal controller and auxiliary board are the same as used in the
FE5680A GPSDO but because of the very low ADEV a separate circuit board that
divides by three and has also two ground isolated transformer output
The development phase of the FE 5680A disciplined controller is nearing
its completion in no small part thanks to Scott's work on frequency/
temperature control. As I have pointed out in the past we have no plans to use
the
5680 so Juerg is considering selling his FE5680A along with control
Thank you Alex I have that info I am concerned about rise time
Bert Kehren
Sent from Samsung tabletAlexander Pummer wrote:
look Charles Wenzel's waveform conversion:
http://www.wenzel.com/documents/waveform.html
73
Alex
On 7/10/2014 11:40 AM, br...@ko4bb.com wrote:
>> On July 10, 2014 at 10:
Magnus
Thank you for your recommendation I use Wenzel extensively as a matter of
fact I just completed in the last three days two boards that have Wenzel on
it and in my projects I can count 14 boards. Rise and fall time is my
concern but I am open to suggestions that is why I turned to the l
Will the added stage negatively effect ADEV?
Bert
In a message dated 7/10/2014 3:48:44 P.M. Eastern Daylight Time,
mag...@rubidium.dyndns.org writes:
Bert,
OK, good that you are familiar with it, it was not obvious in that message.
If you consider it as the first stage, and that you then
Bruce,
please make those tests it will help me to how to proceed and probably many
other time nuts.
Bert Kehren
In a message dated 7/11/2014 3:50:36 A.M. Eastern Daylight Time,
br...@ko4bb.com writes:
The Achilles heel of that biasing technique is that the emitter currents
of the
pair
What I am missing in all these discussions is what do we want to archive
or is this an other paper only discussion. I am used to starting out with a
goal, and tackle the challenge from there.
We have a saying in German "Papier ist geduldig. Translate You can write
any thing on paper.
Bert
Hi Tom
I agre the educational aspect of time nuts is great and I have learned a
lot but it would be even more useful if discussions include what can be
attained and what may be in the reach of time nuts. I used to have a HP 2804A
with matched probe prom only used it once when developing a sup
Slow is not a problem in our applications the loop takes care of that. Will
look in to PT 100.
Bert Kehren
In a message dated 7/21/2014 8:19:48 A.M. Eastern Daylight Time,
alex...@ieee.org writes:
NTC are not that very stable, they are amorphous material winch could
recrystallize slowly
Thank you Charles
. As a first step I will fill one of my Tbolt boxes with small foam
particles. Sounds like a good idea. I have one unit where I have given
particular
attention to low power from the power supply.
Bert Kehren
In a message dated 7/21/2014 7:43:49 P.M. Eastern Daylight Time
Having had more than ten FRK's and M100's on my bench and once locked none
where as low as any thing in E-9. What you should buy is a ubox for $ 16
shipping included and you will with your counter be able to get better than
1 E-9 for testing.
Bert Kehren
In a message dated 8/10/2014 2:30
I am presently downsizing and that has also resulted in shrinking my HP 70
000 series spectrum analyzer. Out with the 70310A OCXO reference. The unit
has a McCoy OSC92-13B OCXO. The original price was $ 5000 and the option
with out OCXO was a $ 2500 saving. Some OCXO. Does any one have any
i
There is no question that direct fan control in combination with a heat
sink is the best solution and we use it on FRK and M 100 with proper thermal
insulation we get 0.01 C on the back plate and better than 0.1 C on the
front. For us the FE 5680 A is not in that class so we looked for a solu
Knowing a litle bit about semiconductor production it is safe to assume
that all 7M series divvices have the same chip and during production at ublox
some features are disabled or enabled. The result is one mask set one chip
run and one inventory.
I did see a recent announcement where a 7M c
I recall when the LEA-M8F was announced that they mentioned a VCTCXO and
maybe I wrongly assumed that they used it for sawtooth correction they also
mention ability to control in addition an external OCXO. I previously
suggested using saw tooth correction information to tune a TCXO but that w
Be patient as soon as we have finished rollout of the FE 5680A and FE 405 B
GPSDO I will be off the list.
Bert Kehren
In a message dated 8/19/2014 9:31:50 P.M. Eastern Daylight Time,
csteinm...@yandex.com writes:
Bert wrote:
>I guess time nuts like to talk about it but not fix it.
Wil
Sorry but I disagree. Having done extensive work with the M7 and M6 in
connection with the with GPSDO work we are doing we have characterized the
units extensively. First from what we can see the difference between a SSR-6T
and a $ 16 M6 is that one has a TCXO and outputs sawtooth correctio
Ed
We may be talking past each other I had problems with the statement that
the basic M6 and M7 are not suitable for GPSDO's. They are not GPSDO's in
them self but great GPS engines even without saw tooth correction which is an
impossibility since the data is not available. But as you observe
Charles
I was also not aware that James Miller had done a Shera, I have copied his
other unit I call a GPS PLL and my notes show a Clark but they are the
same. What I added was a op amp in the filter to drive low impedance OCXO
inputs and we use a $ 15 ublox M7. at 1 KHz. Right out of the bo
Hal there is not one straight answer, as mentioned before these units are
intended for commercial applications with large temperature ranges. Most
have added frequency compensation using heater current sensing for C field
adjustment or in the case of the FE 5680A DDS control. Looking close a
Charles
I agree with every thing you wrote and I am implementing many of your
recommendations. Forty years ago I bought a 15 foot Alu channel to make small
frequency counter housings, always small, and at the time I did have access
to a machine shop so I made end plates. Still have five foot
Bob which Efratom are you talking about?
Bert
In a message dated 8/24/2014 6:33:12 P.M. Eastern Daylight Time,
kb...@n1k.org writes:
Hi
It is not what is done in the Efratom Rb’s. Their pps input is set up to
get things on frequency / on time quickly. The assumption is that you plug
it
Charles
I use double bobble pack inside the Alu channel and I always start out by
monitoring the OCXO and make sure it is at least 10 C below the spec range.
The tbolt is center located and I use a combination of rubber mounts but
suspended that they sell for hard drives and squares of double
Forty years ago I did a digital mixer using three J K FF's to subtract the
IF from the LO for remote monitoring of radio stations. The output is not
symmetrical but great for a frequency counter. Shortly there after Motorola
introduced the MC12000 a D FF intended and widely used for PLL
appl
In the Austron 2110 is a dual D FF Mixer along with circuitry to get 100 Hz
out. I did a board using 2 XTAL Filter stages and you can get 1 E-12 using
a 100 MHz period counter. Using my previously mentioned Ping Pong counter
at 200 MHz and Offset of 1 Hz at 5 MHz you get 1 Hz out. Resolution
we had previous discussions on this subject
I have a friend that is in the bossiness. One of his sites is strictly
limited to material from defense contractors that by law limit shipments to US
citizens or residence, violation as a minimum he looses the contracts.
My time nut projects involve s
Jim, you are patialy correct but 99% only talk, never build any thing
Bert Kehren
Sent from Samsung tabletJim Lux wrote:On 7/6/13 7:23 PM,
Bob Camp wrote:
> Hi
>
> Ok, lets *assume* there is some uber secret gizmo in the sat that makes the
> unsupervised signal absolutely perfect when transm
Take a look at AD 9913, just got boards may have results in a month.
Bert Kehren
Sent from Samsung tabletAnders Time wrote:Thanks a lot
for the input.
I have been looking at the Fluke 6160b, but I thought that there might be
something as good out there that is not 40years old!
I want to use t
Perrier
You are out of line Charles is right on, this list has deteriorated that
many of us are now off list conducting time nuts business, the looser is the
list which has deteriorated in to a chat room and 90%+ messages are
deleted because they are irrelevant, off subject or BS.
Who ever is
for years I have used a slightly modified Aeroflex FS 2000 for phase noise
measuring it is actually better than the 8662 except at the very low end.
What I need is a lockable 800 MHz SAW and the low end will also be better.
Bert Kehren
In a message dated 7/10/2013 7:31:42 P.M. Eastern Dayl
Most MAX have two sets and one could use one as an inverter if one does not
want to add an extra IC.
Bert Kehren
In a message dated 7/13/2013 10:09:12 A.M. Eastern Daylight Time,
als...@nc.rr.com writes:
Guys,
The PIC in question was knowingly programmed "upside down" with the N
option
But a diode with two resistors is
Bert kehren
Sent from Samsung tabletBob Camp wrote:Hi
Hooking the ~ +/- 10V output of a MAX 232 to one of it's CMOS logic inputs
probably isn't a real good idea. Two resistors and a cheap transistor make a
fine inverter in this case.
Bob
On Jul 13, 2013,
Since joining time nuts over four years ago I have not used a single MAX
232 chip. Two reasons MAX do not give me isolation and do generate noise in
critical applications. I prefer the use of two H11 opto couplers which work
perfect. On the receiving end the diode along with a current limiter
I do not understand your question, I am referring to low noise applications
like counters for dual mixers or other AV measurements, but also Shera and
even Tbolt where external noise should be kept to a minimum. When you
chase 1 E-14, isolation is key and I always like to err on the cautious
Diagram of the two opto couplers?
In a message dated 7/25/2013 4:10:54 P.M. Eastern Daylight Time,
paulsw...@gmail.com writes:
Bert pretty sure he is just asking for a diagram. He is interested in the
method of noise isolation.
Regards
Paul.
On Thu, Jul 25, 2013 at 3:32 PM, wrote:
> I
Bill
Thank you I am only looking for a solution that is simple in Corby's case
we used a separate power source, but the question is, is it necessary. That
is why I brought it up to the list. Shopping for ideas.
Bert
In a message dated 7/25/2013 4:06:03 P.M. Eastern Daylight Time,
wb6...@
Thank you Paul. This is exactly what I wanted to know, as I said I already
use the opto couplers the only thing is where to get the power from for the
transmitting side and you answered that. I will not use it but some others
may. I will stay with opto USB..
In a message dated 7/25/2013
Contact me off list and I will make a scetch
In a message dated 7/25/2013 6:34:58 P.M. Eastern Daylight Time,
ma...@non-stop.com.au writes:
Although your description,
" I prefer the use of two H11 opto couplers which
work perfect. On the receiving end the diode along with a current lim
on some of my projects some prefer to use RS 232 and I am not arrogant
enough to say that RS 232 is not an option but try to help them and that was
why I asked the original question to make it for them as simple as possible.
I combine opto with USB but if you want to run 10 devices at the sam
But do you get the speed
In a message dated 7/26/2013 10:41:02 A.M. Eastern Daylight Time,
cfhar...@erols.com writes:
I have enclosed a sketch of the usual way of using opto's to make an
RS232 like interface. I haven't spent much time thinking, so I am sure
that I have a few things backw
We use 57.6 K
In a message dated 7/26/2013 11:26:12 A.M. Eastern Daylight Time,
cfhar...@erols.com writes:
I guess that depends on how much speed you want.
Techniques like this work fine up to 19.2K or so.
Which is what the OP was asking to do, as I recall.
I generally just use a max232
Just got a XSC and a spare module, works great but would like to get a
manual/
Any help will be appreciated.
Thanks Bert Kehren
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Twelve years ago I did disassemble a regular and a high performance tube,
the only negative effect was I joined time nuts. The guts still decorate my
window sill. The only parts inside that may be temperature sensitive are
some copper wires with a clear coating. Every thing else is metal or
Did send Bill some pictures off list
Bert
Sent from Samsung tabletpaul swed wrote:I have numbers of
pix. Each is 2 MB so need another way to handle it.
You will get a good feel from the pictures what I did. Schematic is paper.
Lots of notes I would have to re-decode. It was Oct 2011.
Regards
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