rent com ports.
>
>>>> -Original Message-
>>>> From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Mark
>>>> Spencer
>>>> Sent: Tuesday, September 08, 2015 4:41 PM
>>>> To: Discussion of precise time and frequency measur
t;>> To: Discussion of precise time and frequency measurement
>>> Subject: Re: [time-nuts] Z3805 service information ?
>>>
>>> Hi it seems the GPS module is not working and I suspect the power supply
is
>>> failing. After a few power cycles the unit started
f Of Mark
>>>> Spencer
>>>> Sent: Tuesday, September 01, 2015 12:54 PM
>>>> To: time-nuts@febo.com
>>>> Subject: [time-nuts] Z3805 service information ?
>>>>
>>>> Hi, I realize this is a long shot but I'm curious if anyone has
t;>> To: time-nuts@febo.com
>>> Subject: [time-nuts] Z3805 service information ?
>>>
>>> Hi, I realize this is a long shot but I'm curious if anyone has ever
come across
>>> any form of a service manual (or insight into a power on self test
routine) fo
Mark
Many of us would like those details but they have never crossed time-nuts
path as far as I know.
There has however been various reverse hacks that are helpful. Basically
time-nuts have figure out this and that power supply voltages and such.
Gross stuff. Some have ventured down into Forth.
But
Hi, I realize this is a long shot but I'm curious if anyone has ever come
across any form of a service manual (or insight into a power on self test
routine) for the Z3805 gpsdo ?
One of mine is not working properly after being power cycled. It works well
enough to blink the status lights on
See below:Broadcast (Continuous Output) Mode:
The Serial Port (Port 2) interface is used by
the GPS Receiverto broadcast
the time of day and abbreviated status once every two seconds on the even
second. The length of the transmission is 16 bytes and is partially decoded
below (The data is show
HI
Some simple empirical data:
1) Jumps tend to get further apart as the oscillator ages.
2) AT's have larger jumps than SC's.
3) A typical SC jump is below 1x10^-9
4) It's not a lot of things (spurs, drive, temperature, load,stress,
micro-fractures, plating defects) if you need to explain all
...and I should see the loop time constant in the ADEV, too - if that is
the case, the time constant should be about 2000 s, shouldn't it? (see
picture)
Volker
Am 29.11.2012 05:35, schrieb Said Jackson:
Volker,
This is a classic crystal jump. The crystal changed its frequency magically
fro
On 29 Nov, 2012, at 02:32 , Charles P. Steinmetz
wrote:
>> This is a classic crystal jump. The crystal changed its frequency magically
>> from one second to the next and the software compensated for it
>
> Here is another example of a 3805 having a bad moment. For just about two
> minutes,
von Volker Esper
Gesendet: Mittwoch, 28. November 2012 22:24
An: Discussion of precise time and frequency measurement
Betreff: [time-nuts] Z3805 incident
When looking at the PPS TI vs. time curve today I felt kind
of appalled
- a big incident peak (not an outlier) on the curve! See picture.
What happ
n of precise time and frequency measurement
> Betreff: [time-nuts] Z3805 incident
>
>
> When looking at the PPS TI vs. time curve today I felt kind
> of appalled
> - a big incident peak (not an outlier) on the curve! See picture.
>
> What happened to my Z3805? Any idea?
>
Volker,
This is a classic crystal jump. The crystal changed its frequency magically
from one second to the next and the software compensated for it
You can nicely see the time constant of the loop..
Bye
Said
Sent From iPhone
On Nov 28, 2012, at 13:24, Volker Esper wrote:
> When looking at t
ub-harmonic
>>>> and the carrier. You rarely know what the phase shift is, but you can
>>>> read
>>>> the sub-harmonic. The simple db to jitter ratio gets you close enough to
>>>> make rational decisions on how much filtering you need. You could
>>&
Not Rb but OCXO vs GPS...
Am 28.11.2012 22:47, schrieb Azelio Boriani:
Ops, I missed the EFC value...
On Wed, Nov 28, 2012 at 10:43 PM, Azelio Boriani
wrote:
The reference is still the Rb? Then how you can tell which of the two is
doing that...
On Wed, Nov 28, 2012 at 10:24 PM, Volker Esper
Ops, I missed the EFC value...
On Wed, Nov 28, 2012 at 10:43 PM, Azelio Boriani
wrote:
> The reference is still the Rb? Then how you can tell which of the two is
> doing that...
>
> On Wed, Nov 28, 2012 at 10:24 PM, Volker Esper wrote:
>
>> When looking at the PPS TI vs. time curve today I felt
The reference is still the Rb? Then how you can tell which of the two is
doing that...
On Wed, Nov 28, 2012 at 10:24 PM, Volker Esper wrote:
> When looking at the PPS TI vs. time curve today I felt kind of appalled -
> a big incident peak (not an outlier) on the curve! See picture.
>
> What happ
When looking at the PPS TI vs. time curve today I felt kind of appalled
- a big incident peak (not an outlier) on the curve! See picture.
What happened to my Z3805? Any idea?
No entry in the error log, the staus log says
2012-11-28 10:01:30: The Smartclock Status has changed to LOC
2012-11-28
on of precise time and frequency measurement
Subject: Re: [time-nuts] Z3805 two frequency maxima
I followed your argument and tried to synthesize such a signal. I built
a simple power combiner (3 times 18 ohms resistors) and combined the 10
MHz reference output of my signal generator with a 5
I agree. Please, Paul, start a new thread, and we'll be there.
Volker
Am 28.11.2012 08:10, schrieb Hal Murray:
You might get better answers by starting a new thread rather than hiding your
question in an existing thread. (Use your New message button rather than
Reply, and cut-paste the To ad
You might get better answers by starting a new thread rather than hiding your
question in an existing thread. (Use your New message button rather than
Reply, and cut-paste the To address from an old message, then type in the new
Subject.)
Using a useful Subject also helps people find things i
Greetings!
I just joined the list a few hours ago and you have already peeked
my interest in this aside:
On Tuesday, 27 November 2012, Volker Esper wrote:
Though the SR620 TIC is a great instrument when hunting the pico seconds
we have to realize, that it's a thermal design desaster (I have
th
filter phase but I've never seen that done in practice.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Volker Esper
Sent: Tuesday, November 27, 2012 2:34 PM
To: Discussion of precise time and frequency measurement
Subject: Re
r Esper
> Sent: Tuesday, November 27, 2012 2:34 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Z3805 two frequency maxima
>
>
> I followed your argument and tried to synthesize such a signal. I built
> a simple power combiner (3 times
2:34 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Z3805 two frequency maxima
I followed your argument and tried to synthesize such a signal. I built
a simple power combiner (3 times 18 ohms resistors) and combined the 10
MHz reference output of my s
I followed your argument and tried to synthesize such a signal. I built
a simple power combiner (3 times 18 ohms resistors) and combined the 10
MHz reference output of my signal generator with a 5 MHz signal from the
same generators regular output at the same amplitude. My oscilloscope
showed
Hi
I've always wondered if the magic A1U1 1820-2312 in the 5380A has a frequency
multiplier of some sort in it. I've never dug into it far enough to answer the
question though.
Bob
On Nov 18, 2012, at 8:12 PM, Volker Esper wrote:
>
> As far as I can see the PLL loop filter (SR620) has a co
As far as I can see the PLL loop filter (SR620) has a corner frequency
of about 33Hz. My HP counter 5385A has simply a switch to toggle between
the external source and the internal osc.
Am 18.11.2012 22:45, schrieb Bob Camp:
Hi
Most modern counters have an internal oscillator that they l
Hi
Most modern counters have an internal oscillator that they lock up to the
external reference. The PLL bandwidth is (hopefully) chosen to optimize the
noise contribution of the internal oscillator (quiet broad band) and the
external reference (quiet close in). It will reject anything MHz away
> ...A PLL multiplier will (likely) also ignore the sub-harmonic, the
> jitter will not show up if you use the 10 MHz as a counter timebase
> in a HP counter...
Yes, I wondered what the histogram would show when using the
2-maxima-Z3805 signal as a reference for the SR620 counter. Would the
P
Hi
This is one of those interesting areas where a broadband measurement (like a
counter) and a narrowband measurement (like a DMTD) will give very different
results. The counter will see the sub-harmonic, and call it jitter. It can show
up in an ADEV calculation. A DMTD will ignore the sub-harm
@Azelio: Yes, (like Bob told) it's the phase lock, that locks the two
maxima. Actually the counter is able to look between the 60ps spaced
towers, have a look at the pictures in the first mail of this thread.
However, there is a smallest time value the counter can determine, but
it is much sm
Hi
The 5 MHz and 10 MHz are "locked together" by the multiplier. Their relative
phase is fixed. The 5 MHz component is not free to wander independently
relative to the 10 MHz. Since it's a doubler, you get a two peak plot. If it
was a X3 you would get three peaks. It really only makes sense i
Interesting this, but why exactly 60pS? I would expect also something
in-between. That is, to have the 5MHz energy 64dB below, in my opinion
nothing prevents to have the edge to wander not only at 60pS but
continuously between 0 and 60pS. Maybe the SR620, being a 25pS resolution
counter, simply doe
Hi
A little more detail:
What's going on is more clear if you trigger a scope on the positive edge of
the 5 MHz and look at the 10 MHz. With an ideal multiplier, both the positive
and negative edges of the 5 MHz should line up exactly with a positive edge of
the 10 MHz. In reality, negative ed
Hi
Just good old Fourier series.
Bob
On Nov 17, 2012, at 9:12 PM, Volker Esper wrote:
>
> I'm impressed - but what law is behind this?
>
>
> Am 17.11.2012 21:26, schrieb Bob Camp:
>> Hi
>>
>> 60 db isn't to bad a number. More or less:
>>
>> 100 ns -> 100 ps is 1000:1. 20 log of that is
I'm impressed - but what law is behind this?
Am 17.11.2012 21:26, schrieb Bob Camp:
Hi
60 db isn't to bad a number. More or less:
100 ns -> 100 ps is 1000:1. 20 log of that is 60 db. 100 ps to 60 ps is about
4.4 db. That would sum up to -64.4 dbc. The main gotcha is that you *might* also
Hi
60 db isn't to bad a number. More or less:
100 ns -> 100 ps is 1000:1. 20 log of that is 60 db. 100 ps to 60 ps is about
4.4 db. That would sum up to -64.4 dbc. The main gotcha is that you *might*
also have some 15 MHz (and higher) energy in the signal as well. Also phase
gets into the calc
So let's have a look into the machine... and what do we see? There's a
nice little Symmetrcom oven, with the sign reading "5.000 MHz" - bingo!
May be there's a time saving way to determine the energie of the sub
harmonic: using my spectrum analyzer. It tells me, that there's a 5 MHz
subharmo
Hi
That's what you get if you have "sub harmonic" energy in the output of your
OCXO. I'd bet you a warm glass of beer that you have a 5 MHz / doubled to 10
MHz MTI OCXO in your Z3805. If you have a lot of time on your hands, you can
calculate the likely level of the energy from the amount of j
Hi
There often are series resistors / inductors ahead of the power bricks in all
these designs. I have found several of them fried. After replacement,
everything seems to work ok. I have no idea why they cook out, but they do…
Bob
On Nov 16, 2012, at 2:50 AM, Charles P. Steinmetz
wrote:
> B
Bob wrote:
I've heard much talk in this group about the power supplies on the Z3805.
* * * my Z3805 * * * started producing a real bad smell after a
few hours, the classic burnt transformer type. * * * I opened the
unit and found the 25W 5V, +/-15V (made by AT&T) was real, r
> Doug
>
>
>
>
>
> From: Bob Camp
> To: Discussion of precise time and frequency measurement
> Sent: Sunday, 11 November 2012, 20:52
> Subject: Re: [time-nuts] Z3805 hold-Over
>
> Hi
>
> You may well over drive the GPS b
ntenna is a typical 'Base Station bullet' with an integral 20+dB preamp and
15 feet of RG58
thanks
Doug
From: Bob Camp
To: Discussion of precise time and frequency measurement
Sent: Sunday, 11 November 2012, 20:52
Subject: Re: [time-nuts] Z3805
thanks
Doug
From: BD Systems Inc.
To: "time-nuts@febo.com"
Sent: Sunday, 11 November 2012, 22:58
Subject: [time-nuts] Z3805 hold-Over
The Z3805A utilizes Carrier to Noise C/N instead of Signal Strength. Typical
values of C/N are 25 - 55 whereas Signal Strength
Message: 1
Date: Sun, 11 Nov 2012 14:04:15 -0500
From: "jmfranke"
To: "Doug Parker" ,
Subject: Re: [time-nuts] Z3805 hold-Over
Message-ID:
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Your 21 ns for 1PPS and T1 does n
Doug wrote:
I'll place a preamp in line to see if that increases the SS on the
3805 , maybe my problem is the GPS RX isn't well. Great point.
Note that most GPS engines (including the one in the 3805) report
carrier-to-noise ratio (C/N), NOT signal strength. C/N is a function
mostly of the
oug Parker ; time-nuts@febo.com
> Sent: Sunday, 11 November 2012, 19:04
> Subject: Re: [time-nuts] Z3805 hold-Over
>
> Your 21 ns for 1PPS and T1 does not look too bad, but the satellite received
> signal strengths are too low. You should have at least four or five SS values
Hi
Most of mine get down to ridiculously low numbers after a few weeks to a few
months on. How long seems to depend on how many years the unit has been off
power. Any estimate under 500 ns is questionable with that hardware. The
firmware seems to be quite happy reporting numbers well below that
73s
Doug
G4DZU
From: jmfranke
To: Doug Parker; time-nuts@febo.com
Sent: Sunday, 11 November 2012, 19:04
Subject: Re: [time-nuts] Z3805 hold-Over
Your 21 ns for 1PPS and T1 does not look too bad, but the satellite received
signal strengths are too low. You should have at least four or five S
or
five SS values above 60-80. I always have at least three SS readings
above 100. My Holdover runs between 03 and 4 microseconds.
John WA4WDL
--
From: "Doug Parker"
Sent: Sunday, November 11, 2012 1:36 PM
To:
Subject: Re: [time-nuts]
e 5V power feed going up the coax for the
preamp in the antenna.
73s
Doug
G4DZU
From: jmfranke
To: Doug Parker ; time-nuts@febo.com
Sent: Sunday, 11 November 2012, 19:04
Subject: Re: [time-nuts] Z3805 hold-Over
Your 21 ns for 1PPS and T1 does not look t
--
From: "Doug Parker"
Sent: Sunday, November 11, 2012 1:36 PM
To:
Subject: Re: [time-nuts] Z3805 hold-Over
Hi,
I've got a Z3805 from one of the Chineese sources and had problems with
the HP 11801 oscillator which came with it. Even af
On 11/11/12 16:23, Bob wrote:
Hi All,
I've heard much talk in this group about the power supplies on the Z3805.
After about 10 days with no power here on Long Island (thanks Sandy.), I
finally fired up my Z3805. It started producing a real bad smell after a
few hours, the classic burnt transfor
Hi All,
I've heard much talk in this group about the power supplies on the Z3805.
After about 10 days with no power here on Long Island (thanks Sandy.), I
finally fired up my Z3805. It started producing a real bad smell after a
few hours, the classic burnt transformer type. This is my second Z38
Yes, 5 MHz MTI 260 in both my Z3085 and Z3816A, doubled somewhere inside
for the 10 MHz output.
On 10/15/2012 12:32 AM, Azelio Boriani wrote:
5MHz? Then it is doubled to have 10MHz at the output...
On Mon, Oct 15, 2012 at 8:17 AM, Murray Greenmanwrote:
Ulrich is right about the use of MTI 2
5MHz? Then it is doubled to have 10MHz at the output...
On Mon, Oct 15, 2012 at 8:17 AM, Murray Greenman wrote:
> Ulrich is right about the use of MTI 260 use in GPSDOs. I have a
> Korean-made Z3815A clone (it's labelled Agilent) which has a little
> daughter board with a 5MHz MTI 260 DOCXO in pl
Ulrich is right about the use of MTI 260 use in GPSDOs. I have a Korean-made
Z3815A clone (it's labelled Agilent) which has a little daughter board with
a 5MHz MTI 260 DOCXO in place of the original E1938A used in these models. I
understand that there were production and reliability issues with
)
8. Re: GPSDO control loops and correcting quantizationerror
(Poul-Henning Kamp)
--
Message: 1
Date: Sun, 16 Sep 2012 11:16:59 -0400
From: John Ackermann N8UR
To: Discussion of precise time and frequency measurement
I just acquired one of fluke.l's "Samsung" labeled z3805a units (the one
with double-oven 10811A, 2 10 MHz, 2 PPS, and 2 comm ports. Bob tells
me that the comm ports are configured for RS-232, but I haven't powered
the thing up yet (still working on power supply) so haven't inspected
what the
ent"
>
> Sent: Monday, May 24, 2010 10:10 AM
> Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject)
>
>
> Bob,
>
> On 25 May 2010 00:27, Robert Benward wrote:
>>
>> Bob,
>>
>> I just went out an ordered a bunch of gender changers and null mo
Ah man!!! I had some of those red APC UPS cables!!! Drove me crazy!!!
Bob
- Original Message -
From: "Hal Murray"
To: "Discussion of precise time and frequency measurement"
Sent: Monday, May 24, 2010 2:51 PM
Subject: Re: [time-nuts] Z3805 utility,
Robert Benward wrote:
Checked wires, measured voltages, -0.5 and +2.0 on TX and RX.
Bob
That does sound very odd if it is RS232.
Have you measured these voltages out of the Z38xx unit into just an open
cable? That would take any driving or loading from the PC-end serial
port out of the meas
> My biggest difficulty with ex-telecom GPSDO units has been trying to get a
> USB to serial converter on a PC to talk to the unit.
> There always seems to be another layer that has to be set before it works.
> So far I have always managed to make them work in the end, but getting the
> COM
> Anyway, the key was having "null modem adapters" that are clearly
> identified as such, and everything else straight through.
I've had pretty good luck with the same sort of approach.
One aspect that hasn't been discussed much is the sex of the connectors. PCs
have male DB-9s. The other ty
--Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Steve Rooke
Sent: Monday, May 24, 2010 9:45 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject)
My experiences with these
Checked wires, measured voltages, -0.5 and +2.0 on TX and RX.
Bob
- Original Message -
From: "Steve Rooke"
To: "Discussion of precise time and frequency measurement"
Sent: Monday, May 24, 2010 10:10 AM
Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subjec
of precise time and frequency measurement"
Sent: Monday, May 24, 2010 10:01 AM
Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject)
On 25 May 2010 00:20, Robert Benward wrote:
Steve,
If you are worried about ground loops you should be using RS-422. I can
almost guarantee you that
ptic drivers with fiber optic cable.
Like what I said, so that's at least two votes now :)
Steve
> Stanley
>
>
>
> - Original Message
> From: Robert Benward
> To: Discussion of precise time and frequency measurement
> Sent: Mon, May 24, 2010 7:20:32 AM
>
On 25 May 2010 00:54, jimlux wrote:
> Bob Camp wrote:
>>
>> Hi
>>
>> Gotta label them *something* or sorting through them in the cable bin
>> becomes pretty difficult.
>> In addition to the wiring options you can (obviously) have either a male
>> or female on either end. There are so many "odd" pi
Message
From: Robert Benward
To: Discussion of precise time and frequency measurement
Sent: Mon, May 24, 2010 7:20:32 AM
Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject)
Steve,
If you are worried about ground loops you should be using RS-422. I can almost
guarantee you that pin 7
roblem. You are using the lower
25 way connector on the Z3805A I hope. You need to talk to it a 9600,
8 bits, 1 stop bit and no parity.
Steve
> Bob
>
> - Original Message - From: "Bob Camp"
> To: "Discussion of precise time and frequency measurement"
>
>
ed pairs like RS-422.
> Bob
>
>
> - Original Message - From: "Steve Rooke"
> To: "Discussion of precise time and frequency measurement"
>
> Sent: Monday, May 24, 2010 1:40 AM
> Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject)
>
&g
My experiences with these serial USB adapters has been very good but
I've sort of only used these with Linux. They should be recognised by
the OS as a serial port providing device and allocated a device. You
need to find out what that device is as it's unlikely to be the next
COM port in succession
Bob Camp wrote:
Hi
Gotta label them *something* or sorting through them in the cable bin becomes pretty difficult.
In addition to the wiring options you can (obviously) have either a male or female on
either end. There are so many "odd" pieces of gear out there that you can have
pretty much
ssage -
From: "Bob Camp"
To: "Discussion of precise time and frequency measurement"
Sent: Monday, May 24, 2010 7:15 AM
Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject)
Hi
Gotta label them *something* or sorting through them in the cable bin becomes
pretty diffi
overcome the common mode noise.
Bob
- Original Message -
From: "Steve Rooke"
To: "Discussion of precise time and frequency measurement"
Sent: Monday, May 24, 2010 1:40 AM
Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject)
On 24 May 2010 15:22, Robert
ly thing connected to the shell would be the
> shield if one is available.
>
> Bob
>
> - Original Message - From: "Bob Camp"
> To: "Discussion of precise time and frequency measurement"
>
> Sent: Sunday, May 23, 2010 9:21 PM
> Subject: Re
I have been reading the posts with interest.
My biggest difficulty with ex-telecom GPSDO units has been
trying to get a USB to serial converter on a PC to talk to the unit.
There always seems to be another layer that has to be set before it
works.
So far I have always managed to make them work
From: "Bob Camp"
> To: "Discussion of precise time and frequency measurement"
>
> Sent: Sunday, May 23, 2010 9:21 PM
> Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject)
>
>
>> Hi
>>
>> Long ago I decided to go with the terms &qu
, adding to the confusion.
Bob
- Original Message -
From: "Mike S"
To: "Discussion of precise time and frequency measurement"
Sent: Sunday, May 23, 2010 10:29 PM
Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject)
At 09:27 PM 5/23/2010, Robert Benwar
b
- Original Message -
From: "Bob Camp"
To: "Discussion of precise time and frequency measurement"
Sent: Sunday, May 23, 2010 9:21 PM
Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject)
Hi
Long ago I decided to go with the terms "straight" and "
s] Z3805 utility, Was: AW: (no subject)
>>
>>
>>> Jeff,
>>> A plain serial cable will have 2&3 swapped, a "straight through" is 2-2
>>> and 3-3. There were a lot of DB25 to DB25 that were NOT serial cables, they
>>> were just 25 pin cable us
At 09:27 PM 5/23/2010, Robert Benward wrote...
If your device is a DCE, then pin 2 is really a RX input, not a TX
output.
You're looking at it wrong - a modem is a DCE, and pin 2 is Transmitted
Data (TX) input. That is, data input to the modem for transmission to
the remote. TX is an output o
on and my sanity on many an occasion :)
Steve
> Jeff
>
> - Original Message - From: "Stanley Reynolds"
>
> To: "Discussion of precise time and frequency measurement"
>
> Sent: Sunday, May 23, 2010 7:41 PM
> Subject: Re: [time-nuts] Z3805 utilit
RS-232 than many other things so your
not on your own.
Steve
> Bob
>
>
>
>
> - Original Message - From: "Jeff Hook"
> To: "Discussion of precise time and frequency measurement"
>
> Sent: Sunday, May 23, 2010 7:09 PM
> Subject: Re: [time-nu
oftware.htm
> It runs thru all baud rates, trying to communicat with the 38xx
> You could give that a try.
>
> Jeff
>
> - Original Message - From: "Robert Benward"
> To: "Discussion of precise time and frequency measurement"
>
> Sent: Su
my previous
ramblings.Bob- Original Message - From: "jimlux"
To: "Discussion of precise time and frequency measurement"
Sent: Sunday, May 23, 2010 8:58 PM
Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject)
> Stanley Reynolds wrote:
>>
>>
Hi
Long ago I decided to go with the terms "straight" and "null modem" for the
cables I use. NM and ST are easy to mark and hard to confuse.
Bob
On May 23, 2010, at 8:58 PM, jimlux wrote:
> Stanley Reynolds wrote:
>
>>
>> Dec computers / terminal servers were as I described, but many brands
t; for a few hours now.
>
> Bob
>
> - Original Message - From: "Jeff Hook"
> To: "Discussion of precise time and frequency measurement"
>
> Sent: Sunday, May 23, 2010 9:15 PM
> Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject)
>
>
>
, May 23, 2010 9:15 PM
Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject)
Bob,
Does your "plain" serial cable have 25pin on one end and 9pin on the other?
If so, it shoud be 2-3 and 3-2 (because of DB9 toDB25 conversion)
If its 2-2 and 3-3 its a null modem cable (this is what
ings.Bob- Original Message - From:
"jimlux"
To: "Discussion of precise time and frequency measurement"
Sent: Sunday, May 23, 2010 8:58 PM
Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject)
Stanley Reynolds wrote:
Dec computers / terminal servers were
Bob,
Does your "plain" serial cable have 25pin on one end and 9pin on the other?
If so, it shoud be 2-3 and 3-2 (because of DB9 toDB25 conversion)
If its 2-2 and 3-3 its a null modem cable (this is what you want)
This is not true if its 9 pin to 9 pin or 25 pin to 25 pin cable
"standard" serial c
Stanley Reynolds wrote:
Dec computers / terminal servers were as I described, but many brands
were different. Still have a BOB aka break out box with LEDs to
indicate levels, matching transmit and receive is easy, getting the
hardware flow control / signaling right was a little more diffic
Stanley
I still have a serial BOB too!
Its no wonder they moved away from RS-232.Ha-Ha
Jeff
- Original Message -
From: "Stanley Reynolds"
To: "Discussion of precise time and frequency measurement"
Sent: Sunday, May 23, 2010 7:41 PM
Subject: Re: [time-nuts
ther way around?
I always feel like an amateur when playing with RS-232.
Bob
- Original Message -
From: "Jeff Hook"
To: "Discussion of precise time and frequency measurement"
Sent: Sunday, May 23, 2010 7:09 PM
Subject: Re: [time-nuts] Z3805 utility, Was: AW:
- Original Message
From: Robert Benward
To: Discussion of precise time and frequency measurement
Sent: Sun, May 23, 2010 4:38:43 PM
Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject)
Jeff,
Generally for a given DTE, there is a swap of 2&3 when going from DB9 to DB25
uot;
To: "Discussion of precise time and frequency measurement"
Sent: Sunday, May 23, 2010 7:09 PM
Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject)
Bob,
Serial ports have always been tough to get working right.
I guess I shouldn't call a serial cable, a straight cable.
ty beyond 10E-8.
I will try that program you suggested, but again, the voltages I'm getting are
not right.
Bob
- Original Message -
From: "Jeff Hook"
To: "Discussion of precise time and frequency measurement"
Sent: Sunday, May 23, 2010 7:09 PM
Subject: Re:
rt Benward"
To: "Discussion of precise time and frequency measurement"
Sent: Sunday, May 23, 2010 4:41 PM
Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject)
Jeff,
A plain serial cable will have 2&3 swapped, a "straight through" is 2-2
and 3-3. There were a lot
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