The text file accompanying the EPROM file on KO4BB's site mentions
using this EPROM image with a NI controller. I have a NI GPIB-232CV-A.
Can I use the image with this controller? If so, I assume that I then
have the equivalent of an IOTECH controller?
I partially disassembled my GPIB-232CV-A and
Yes...
Thank you, and the others, for the suggestions for cleaning/reviving the
unit, but I can't recommend to my friend to keep a pile of rust (if
water damage really is the problem) advertised as an used working item.
Regards,
bbg
On 3/17/2012 4:10 PM, Azelio Boriani wrote:
LPFRS from
After further testing, including a simple lost lock detector (2 555s:
manually resettable bistable + multivibrator and a buzzer), with the
serial port the whole picture looks even grimmer. Most parameters seem
to be in nominal range, relatively stable after warmup, with the notable
exception
If it's a 44pin plcc I can burn it.
Dale Robertson
NV8U
-Original Message-
From: Joseph Gray jg...@zianet.com
Sent: Sunday, March 18, 2012 3:18am
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Subject: [time-nuts] IOTECH 488 EPROM
The text file accompanying
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
In message 4f65d971.8070...@arcor.de, ehydra writes:
http://home.earthlink.net/~christrask/Complementary%20Push-Pull%20Amplifiers.pdf
In my implementation, it covered DC to 200MHz until I low-pass'ed it.
His designs are always a good source but this one is AC-coupled ;-)
Not in my
Joe,
The NI GPIB-232CV-A uses an ST M27C256B-15C1 One Time PROM in a PLCC 32 pin
package. However, a Winbond W27E257 EEPROM is a pin for pin substitute.
The M27C256B and the W27E257 both come in a 28 pin DIP package (0.6 spacing)
so you should be able to use a programmer with that chip support
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:
Hello to the group.
Indeed the prom changes the behavior to a full controller and the ones I
listed were changed and worked. Because those were the units I had found
over the years.
No idea about this particular prom and such.
Regards
Paul
WB8TSL
On Sun, Mar 18, 2012 at 10:12 AM, J. L. Trantham
On Mar 16, 2012, at 1:32 AM, Peter Monta wrote:
Attached are some more renderings of John Seamons' WWVB data. This is
what one might expect from a receiver that knows when the phase
reversals happen and takes them out noiselessly---re-reversing the
out-of-phase bursts to recover an
Paul,
Have you tried this in an NI GPIB-232CV-A or a GPIB-232CT-A? I have tried
to swap the data between a 232CT-A and a 232CV-A with no joy. The two units
are fundamentally different.
That's why I have the chips.
Joe
-Original Message-
From: time-nuts-boun...@febo.com
The text file doesn't mention any particular model numbers, it just
lists NI, along with others. I want to make sure that the NI
GPIB-232CV-A will work with the other firmware. Has anyone done this
specific model?
Joe Gray
W5JG
On Sun, Mar 18, 2012 at 8:38 AM, paul swed paulsw...@gmail.com
Joe,
I have not tried it but I could.
I guess I would download the file from Didier's site, program the EEPROM and
give it a shot. It's a 64 KB EPROM going to a 256 KB EPROM. Doesn't sound
right to me.
Joe
-Original Message-
From: time-nuts-boun...@febo.com
On Sun, 18 Mar 2012 13:25:54 +
Poul-Henning Kamp p...@phk.freebsd.dk wrote:
In message 4f65d971.8070...@arcor.de, ehydra writes:
http://home.earthlink.net/~christrask/Complementary%20Push-Pull%20Amplifiers.pdf
In my implementation, it covered DC to 200MHz until I low-pass'ed it.
His
On Sun, 18 Mar 2012 09:12:09 -0500
J. L. Trantham jlt...@att.net wrote:
I've never seen a PLCC UV erasable package. Do
they exist?
They did... long long ago.. I havent seen one in a long time.
Ok, i haven't seen a EPROM with window in a nearly as long time either :-)
I've never seen a PLCC UV erasable package. Do they exist?
Yes. We used them many years ago.
They are much more expensive than the write-once plastic packages. For the
chips we were using, it was more than 2x. If you were reasonably sure you
wouldn't need to reprogram them, plastic
Joe
Its been a while since I posted those eproms and info.
I need to do 2 things. Look specifically at my models tested and listed and
see what that means in the context of your question. Perhaps later today.
Regards
Paul.
WB8TSL
On Sun, Mar 18, 2012 at 11:38 AM, J. L. Trantham jlt...@att.net
The circuit in question doesn't appear to be in the PDF. You need to use
a lot of caution with Lankford's theories. I don't want to get into a
pissing contest, so I will leave it at that.
Push pull with transformers goes back to the tube days. It is a
convenient scheme to kill 2nd harmonic
My choice would be a center tapped, shielded, air core loop, running into
a low noise instrumentation amp. Center tap of loop to twinax shield,
grounded at preamp.
The instrumentation amp has fixed gain, and very high CMRR and PSRR. It
also does the differential to single ended conversion
ehydra wrote:
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.
Not really the gain inaccuracy is somewhat excessive.
One can do much better with the right
In message 20120318182440.7cb729c2b018b0b2ca5f9...@kinali.ch, Attila Kinali w
rites:
On Sun, 18 Mar 2012 13:25:54 +
Not in my implementation, I have eliminated the input capacitor because
the active element is 3cm from the PCB,
Could you explain how the distance of the antenna to the PCB
I was not concerned about processing power on a PC (or Mac for that matter) but
for the uC that was used in PHK's project.
Didier KO4BB
Sent from my BlackBerry Wireless thingy while I do other things...
-Original Message-
From: Chris Albertson albertson.ch...@gmail.com
Sender:
DC in a transformer raises the low frequency corner a bit. Obviously not
a problem in your case.
I should point out that every active device Lankford puts in the signal
chain adds noise since the amp is really just a buffer, not an
amplifier. You really want front end gain so that devices
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