For any programs which may need user-level access to their directory (e.g.
for the user to edit a .INI file) I now use a \Tools\ rather than the
Program Files directory, so I would use:
C:\Tools\Heather\
and so forth. It also avoids the requirement for quotation marks round
paths with
I like your \Tools suggestion. Some additional solutions:
1) Create a virtual drive letter for Program Files, as in:
subst P: c:\profiles files
Then run p:\heather\heather.exe
2) Use an environment variable, as in:
set LH=c:\program files\heather\heather.exe
Then to run heather, type
HI
A died in the wool Time Nut who doesn't care what time it is - what's the
world coming to
Bob
Hi Bob,
I think you mean dyed in the wool. A *died* in the wool time nut could be
used to describe a frozen 19th century sextant and sidereal pendulum clock
carrying Antarctic
I mean BFT92 in sot23, sry for typo.
lc
ct1dmk.
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of ct1dmk
Sent: Monday, July 23, 2012 7:26 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts]
It was reasonably easy to get to the input connector to replace it. I haven't
seen the firmware source code but would be interested if it became available to
play with. Some HP instruments used proprietary CPUs (or nanoprocessors)
which might be tricky to play with due to their instruction set
I did install a bnc connector for input - pain - it took a few hours. Save
yourself a lot of grief and purchase a Canare bcj-vwp bnc adapter from
Markertech or others. Works fine.
Bill Riches, WA2DVU
Now that I have my new [30 year old] HP 3586 making measurements over the
GPIB bus I have a
It was very easy to replace the input connector on my 3586A, not sure about
the other versions.
Didier KO4BB
Bill Riches bill.ric...@verizon.net wrote:
I did install a bnc connector for input - pain - it took a few hours.
Save
yourself a lot of grief and purchase a Canare bcj-vwp bnc
24/07/2012 13:14
My Racal Dana 9908 can take a 1 Mhz external reference. Inputting my
Thunderbolt at 10 MHz works, but shifts the decimal point over. I am
not sure if this has any other detrimental effects as to accuracy or
other? What's the easiest way to have a 1 MHz reference from the
Ready made or to be built? Use a divide-by-10 (7490-like) set to divide
with 50% duty cycle or divide by 5 then by 2.
On Tue, Jul 24, 2012 at 2:18 PM, Chris Wilson ch...@chriswilson.tv wrote:
24/07/2012 13:14
My Racal Dana 9908 can take a 1 Mhz external reference. Inputting my
Ready made or to be built? Use a divide-by-10 (7490-like) set to divide
with 50% duty cycle or divide by 5 then by 2.
Thanks for the reply Azelio.
Sorry, should have said, ready built, got too many half finished jobs
on the go right now. FAR too many according to my wife
Will be
Mine are not handy, so I'm not sure it has 50% output duty, but the Ballantine
6130A Time Mark Generator is a potential candidate. It's not much more than a
chain of 7490 dividers fed from a 10MHz source, and has a (non-nut) ovenized
oscilltor built in. Even has synchronized multipliers that go
A Tektronix DD501 will do divide by 10, or any number from 2 to 9.
-John
===
Mine are not handy, so I'm not sure it has 50% output duty, but the
Ballantine
6130A Time Mark Generator is a potential candidate. It's not much more
than a
chain of 7490 dividers fed from
A Tektronix DD501 will do divide by 10, or any number from 2 to 9.
-John
Thanks, was hoping for something as a permanent, small and cheap
fitting, standalone. Don't really want to tie up my 7233 running
something to run something else IYSWIM? Was hoping China Town would
have the
I would do a dead bug construction and insert inside the equipment and mark it
10MHz reference.
All your instruments will be sync.!
Raj, vu2zap
At 24-07-2012, you wrote:
Ready made or to be built? Use a divide-by-10 (7490-like) set to divide
with 50% duty cycle or divide by 5 then by 2.
On
Unfortunately, the TAPR T2-Mini divider
(http://www.tapr.org/kits_t2-mini.html) can't quite get to 1 MHz from 10
MHz with the PIC divider chip due to limitations in the chip architecture.
However, nothing says you couldn't dead bug in a decade divider chip
in place of the PIC, and let the
I think the HP 5087 Distribution Amp has a card that will do divide-by-ten.
-John
==
Unfortunately, the TAPR T2-Mini divider
(http://www.tapr.org/kits_t2-mini.html) can't quite get to 1 MHz from 10
MHz with the PIC divider chip due to limitations in the chip architecture.
Chris,
my vote is for the David Partridge 'time-nuts' frequency divider that
was discussed and optimised here in detail some time ago.
It divides everything you might need from the 10 MHz input. There are
separate outputs for 10 MHz, 5 MHz, 1 MHz, and one that can be
configured for 100 kHz /
John,
That's interesting to me. What exactly are the actual structural limitations of
[that] pic?
-CH
On Jul 24, 2012, at 7:55, John Ackermann N8UR j...@febo.com wrote:
Unfortunately, the TAPR T2-Mini divider
(http://www.tapr.org/kits_t2-mini.html) can't quite get to 1 MHz from 10 MHz
On Tue, Jul 24, 2012 at 7:28 AM, Chris Wilson ch...@chriswilson.tv wrote:
A Tektronix DD501 will do divide by 10, or any number from 2 to 9.
-John
Thanks, was hoping for something as a permanent, small and cheap
fitting, standalone. Don't really want to tie up my 7233 running
Chris,
my vote is for the David Partridge 'time-nuts' frequency divider that
was discussed and optimised here in detail some time ago.
It divides everything you might need from the 10 MHz input. There are
separate outputs for 10 MHz, 5 MHz, 1 MHz, and one that can be
configured for 100
Chris,
A PIC requires 4 clock cycles per instruction which limits the
maximum output rate a PIC can provide as partial instruction
times can't be used. With a 10 MHz input each instruction takes
400ns and if duty cycle isn't an issue nop instructions can be
added each loop to extend the cycle
John,
That's interesting to me. What exactly are the actual structural limitations
of [that] pic?
-CH
The PIC has a 4:1 external clock / internal instruction cycle ratio so a
software-based divider can't divide by a low number like 10. See
www.LeapSecond.com/picdiv for details, and
TVB can give a better answer, but in general the number of clock cycles
required per instruction limits the minimum divide ratio.
Tom whipped up a special PIC to get the highest possible output rate for
a set of tests we were doing, and given the 20 MHz maximum input clock,
we got about 800
I found some information on the 3586 by looking at
the service manual PDF. The processor is a Motorola 6800,
the same family I used in 1975 for Sidereal. According to
the parts list, the 32768 ROMS are in sockets.
Two revisions of firmware are discussed. The newer
revision can be identified
Hi Gang,
Has anyone looked into working over the filters and detection
circuitry in the C model. I have not looked to see if that part is
discrete or firmware.
Thanks,
Hadley
K7MLR
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Hi
With some micros you can play with the PWM outputs to get a bit faster than the
instruction cycle would allow. There are always constraints (like binary
division) on that as well.
Bob
On Jul 24, 2012, at 5:21 PM, John Ackermann N8UR wrote:
TVB can give a better answer, but in general the
Hi,
I have an older HP 58 503A with option 001 display but it is very dim from age.
Does anyone know of a replacement display IC for this?
Thanks
Jeff
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A part like any the Cypress PSoC family is much more flexible (but potentially
harder to program) than the PIC because it has hardware blocks that can be
made to do very useful work independent of the processor. The processor can run
on its internal RC oscillator while one digital block would
The cheapest is a 74HC90 with a 74HC14 one as input the other five as
output. Can also be LS.
The best with all bells and whistles is a Altera MAX 3000 gate array with
two selectable outputs paralleling four outputs with resisters,
transformer input with Wenzeland sync input. No SMD's
From: Chris Wilson ch...@chriswilson.tv
Ready made or to be built? Use a divide-by-10 (7490-like) set to
divide with 50% duty cycle or divide by 5 then by 2.
Thanks for the reply Azelio.
Sorry, should have said, ready built, got too many half finished jobs
on the go right now. FAR too many
Dave M wrote:
From: Chris Wilson ch...@chriswilson.tv
Ready made or to be built? Use a divide-by-10 (7490-like) set to
divide with 50% duty cycle or divide by 5 then by 2.
Thanks for the reply Azelio.
Sorry, should have said, ready built, got too many half finished jobs
on the go right
There is a quite the knowledge of this and many other HP/Agilent
instruments on the Yahoo group hp_agilent_equipment. That is not to
say there isn't here. But just more members since this is time-nuts
not TM-nuts.
Including reference to at least one web site that has details on
things like the
Hi time-nuts guys, I am looking for the email address for David Partridge. I
want to find out more information on the 'time-nuts' frequency divider that was
discussed and optimised here in detail some time ago.
Thankyou Ken Kubick
I recently picked up an interesting early 1970s vintage WWVB
receiver, Model 630, made by Specific Products of Monrovia, CA -
that's what the adhesive sticker on the front says, and the name 1
MHz Time Base Calibrator (Utilizes WWVB accuracy of 2 parts in
10^11). There's also a pair of banana
I agree - just tack a CMOS or LSTTL decade divider right inside the
equipment for now, then provide a fancy divider in your distribution
amp if you get around to it.
It's funny that entire extra instruments and programming
microcontrollers are being discussed to replace a simple fifty year
On 7/24/12 8:48 PM, ed breya wrote:
I recently picked up an interesting early 1970s vintage WWVB receiver,
Model 630, made by Specific Products of Monrovia, CA - that's what the
adhesive sticker on the front says, and the name 1 MHz Time Base
Calibrator (Utilizes WWVB accuracy of 2 parts in
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