Joe Hobart writes:
> I can read and write the DS3231 registers with a Raspberry Pi. Unfortunately,
> the RPi kernel sends time to the RTC every 11 1/2 minutes. This time is
> usually
> moderately accurate, but I have measured errors of up to 0.264 second, which
> is
> unacceptable.
That's the
On 3/7/19 6:37 PM, Richard (Rick) Karlquist wrote:
I happened to get a good deal on a PTS310 with thumbwheels.
It is indeed a good synthesizer performance wise, but
the thumbwheels are obviously clumsy.
Most of them have a BCD digital interface on a (probably expensive if
bought new)
On 07.03.2019 14:14, Jim Harman wrote:
For ease of programming and reasonably low power consumption I would look
into an Arduino.
Hello,
I can only agree. Use Ardiuno and you will have complete control about
your environment. You can even put your board into sleep between pulses.
For
A couple of comments about the PTS units...
While the potential noise floor is very low (depending on the quality of
the reference oscillator), there can be significant spurs depending on
how many non-zero digits you have dialed in. With the analog multiply
and mix architecture, the more
I happened to get a good deal on a PTS310 with thumbwheels.
It is indeed a good synthesizer performance wise, but
the thumbwheels are obviously clumsy.
Rick N6%K
On 3/7/2019 4:15 PM, Alex Pummer wrote:
that is a relative low noise synthesizer
Programmed Test Sources PTS 160 Frequency
Bert,
I'm interested in your quest.
I'm interested in batteries for not only the 5065A but also the 5061A and B. I
was thinking of an SLA for the 5061's. I like the idea of being able to move
the units without having to also move a separate battery backup system
simultaneously.
What have
On 3/7/19 15:36, ew via time-nuts wrote:
>
> Having recently acquired a HP 5065A with clock I decided to put a battery in
> it. My choice is 5000 mA Lithium Ion. Having in the past very good experience
> with a Florida vendor, was first choice. Sadly he is going out of business.
> 90+% out
that is a relative low noise synthesizer
Programmed Test Sources PTS 160 Frequency Synthesizer
73
Alex
On 3/7/2019 11:04 AM, Richard (Rick) Karlquist wrote:
On 3/7/2019 8:56 AM, Didier Juges wrote:
The king of low close-in noise are the HP8662 (990MHz) and HP8663
(2GHz?)
by about
Thanks Bob, Bob L, and Hugh.
I will look further into the exact specs of this 68HC11. Being this is a
small densely packed portable radio, the circuit foils are very tiny,
the stray capacitance is probably lower than typical design. Good point
on using the div/4 pin to measure the clock and
Having recently acquired a HP 5065A with clock I decided to put a battery in
it. My choice is 5000 mA Lithium Ion. Having in the past very good experience
with a Florida vendor, was first choice. Sadly he is going out of business.
90+% out there is junk, have 26650s with 1800 mA. Last week
Hiya,
A quick observation, though I'm mindful we may be drifting (sorry...)
from the charter of time-nuts somewhat.
I worked with 'HC11s a fair bit when they were current and seem to
recall there were some subtle variations on the load capacitance
requirements for the different variants
On 3/7/2019 8:56 AM, Didier Juges wrote:
The king of low close-in noise are the HP8662 (990MHz) and HP8663 (2GHz?)
by about 20dB at 1kHz compared to the 8644A
Didier KO4BB
When I worked at Agilent, my lab had a half dozen HP8662's and some
63's. They were not useful for any kind of
Fluke 96040A disagrees from the back bench.
Leo
> From: Tom Knox
> Much more expensive, but in a class by itself is the Rohde SMA100A option B22.
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The very low phase noise requirements for a 3GHz generator really cuts down
your options while raising the price significantly. You may be better off
with two boxes if you can really reduce your requirements to what you need
as opposed to what you want.
Also, I am sure you have seen that the
The 8664, et al, has low phase noise in terms of a general
purpose signal generator. However, it is quite inadequate
as a clock generator. The Agilent E5505 phase noise test
system has an accessory frequency divider that you are
supposed to use with the E8663 to get low phase noise
below 100
Hi Don;
Much more expensive, but in a class by itself is the Rohde SMA100A option B22.
Enjoy;
Tom Knox
303-554-0307
act...@hotmail.com
"Peace is not the absence of violence, but the presence of Justice" Both MLK
and Albert Einstein
From: time-nuts on behalf
Leo,
Thanks for the IFR/Aeroflex/Marconi 2401 suggestion, I looked at the data
sheet and it might be a good alternative to watch for. I REALLY like the
"closed box" calibration feature. I was suspicious of the E44xx series but
never used or tested one, I had some hope that like other HP/Agilent
Joe, I'm not Roger but I've worked a lot with Motorola micros. Your conclusion
of 18pF seems reasonable as the design uses 24pF tuning caps, which are a bit
high compared to the values recommended in the HC11 reference manuals. In
section 2 they recommend 25pF total capacitance including
Hi
Load capacitance on a crystal is not at all easy to guess from the “stuff”
hanging
off of an MCU chip. There’s simply to much inside the chip that you have no way
of knowing about. If indeed you *need* a very accurate crystal, it gets custom
made
for whatever that particular circuit happens
Hi Jim,
The 100K to 3G frequency range of the 8664A is what I'm looking for as a
general signal source. The low phase noise needed will mostly be under
100MHz for work on clock, trigger and timing circuits. Thanks for the reply,
Don
-Original Message-
From: time-nuts On Behalf Of jimlux
Here is an example Arduino sketch that controls the DS3231, blinks the
Arduino's LED, and displays the current time and temperature on the
controlling PC, using the Arduino Wire and Chronodot libraries. For even
better precision, you would want to run the PPS line to an interrupt and
use an ISR to
For ease of programming and reasonably low power consumption I would look
into an Arduino.
There are libraries available to control the DS3231 and your choice of
displays. The Chronodot is a nice prototyping package for the 3231.
https://www.adafruit.com/product/255
On Wed, Mar 6, 2019 at 8:02
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