FYI there are some rather flat video filter ICs that have been made in the
past. The 6th order HMC1023LP5E is tunable, at its 28MHz setting its flat then
down 0.1dB in the teens, down 0.35dB at 20 MHz. That same setting is 60dB down
at about 90 MHz. It is also a dual part, designed for matched I
Paul,
Take a look at page http://www.leapsecond.com/pages/tbolt/photos.htm
The fourth pic down in the right column shows the power connector soldered
directly to the PCB (upper left edge, by C6).
If your power 6 pin header is in the same spot then it is highly probable the
pinout is identical.
ise time and frequency measurement"
>
> Subject: [time-nuts] Re: Another reason to monitor line frequency :) - My AC
> measurement project & question
>
> On 1/21/22 7:00 PM, Robert LaJeunesse wrote:
> > Stick with the transformer. The use of a capacitive divider is pred
Stick with the transformer. The use of a capacitive divider is predicated on
the line waveform always being a sine wave. Dream on! All it takes is one good
spike down the line, maybe only 20-30V amplitude, and your capacitive divider
passes it right on to that ADC that has a much lower (3.3V?) l
Drops in a hole in the PCB. I doubt that you could buy that exact one, it is
unusual and probably custom. Pin terminals and fork terminals are much more
common. The closest I could find to the pictured one are from Cambion
Electronics, which has (smaller diameter) hollow PTFE insulated press-mou
That film cap does look a little cooked. Since it is a 2uF 20% 50V part a more
common 2.2uF 10% 63V part would likely be an acceptable substitute, and
basically still within overall tolerance. Judging from the teflon solder cup
used I suspect insulation resistance is a critical parameter. Be sur
The mains connector proper is readily available:
https://www.ebay.com/itm/201639994813?chn=ps
But the snap-on metal backshell is less available:
https://www.etsy.com/listing/62249/backshell-for-amphenol-78-and-86
-series
Shown here with back clamp:
https://www.etsy.com/li
It works.
> Sent: Tuesday, June 22, 2021 at 1:26 PM
> From: "Mark Sims"
> To: "time-nuts@lists.febo.com"
> Subject: [time-nuts] test message
>
> My email address book got corrupted. Hopefully this will work...
> ___
> time-nut
FWIW. No detailed content, and a rather quick read. "Five key trends in GPS".
https://www.u-blox.com/en/blogs/insights/five-key-trends-gps
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7;t tell,
> this is a standard (not RP)* female* connector. That's my story and I'm
> sticking to it!
>
> Bob, are you by chance thinking of buying one of these? If so, please let
> us know which it
> is right away when it arrives.
>
> Dana
>
>
> On F
Just spotted this: https://www.sparkfun.com/products/17382
Datasheet:
https://cdn.sparkfun.com/assets/6/e/a/9/2/BT-147_GNSS_Antenna_Datasheet.pdf
Chokeplate design, 40dB LNA, TNC connector
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To unsu
If panel and connector sizes permit a small single hole panel mount connector
can be insulated with a fiber shoulder washer and a flat fiber washer.
https://www.keyelco.com/category.cfm/Shoulder-Washers-Bushings/Fibre-Shoulder-Washers/id/813
https://www.keyelco.com/category.cfm/Washers/Nylon-Fibre
Tom, have a look at "Super Corona Dope"
https://www.mgchemicals.com/products/conformal-coating/insulation-coatings/4226-super-corona-dope/
Bob L.
> Sent: Saturday, September 26, 2020 at 8:21 PM
> From: "Tom Van Baak"
> To: time-nuts@lists.febo.com
> Subject: Re: [time-nuts] New member, new ol
That was the same frequency Chrysler used in their early (70s) quartz car
"chronometers". The 1981 Chrysler Imperial electronic dashboard used that
frequency as well.
Bob L.
> Sent: Friday, September 11, 2020 at 1:30 PM
> From: "Bill S"
> To: "time-nuts@lists.febo.com"
> Subject: [time-nuts]
The similar meters I have are based on the Microchip MCP3421, a tiny 6-pin SOT
18 bit ADC with internal 2.048V 15 ppm (typ) reference, differential inputs,
and a PGA. Input span is +/-2.048V at minimum gain to +/-0.256V with a PGA gain
of 8. So at max gain 1 LSB is about 2uV, although I'd be sur
Makes me think one could use the input signal edge to synchronize a 2N6027
based programmable unijunction oscillator, thus effecting a divide by 5.
Unlikely the 6027 would be fast enough for 50 MHz, but maybe a 2 transistor
equivalent using RF transistors? Output would be nowhere near the 40%-60
Take a look at the "modified" shift-register like counter in the attached jpg
file. When simulated online it behaved as expected for a divide by 5. I believe
it also is self-clearing from illegal states, but the other simulator I tested
that in wasn't good for documenting the design.
Bob L.
>
Gilles, if I read the Calosso-Rubiola paper correctly a Pi divider is pretty
much your standard square-wave producing digital divider, such as a 74163 (for
even divides). There's odd-value (3,5,7) Pi dividers shown at
https://www.theremin.us/Circuit_Library/symmetrical_digital_dividers.html. Wha
While I'm no expert at time, or Arduino yet, the first thing I would look at is
getting the bootloader to run with not 16MHz, but a 10MHz clock. Not having
looked at it I don't know if it requires modifying and re-flashing, but it
might. Now the VCTCXO can clock the Arduino and the Arduino IDE w
Steve, you shouldn't need a schematic. Look for a resistor between the output +
line and the pot that adjusts the voltage. Determine the value and add a shunt
resistor across it that is maybe 10x the value determined. See if that drops it
down enough. Adjust the shunt up or down to get the range
There's usually three wires feeding one's house. It's quite possible for just
one of them to have a bad connection. If you are really unlucky the neutral
will open, and overvoltage/undervoltage many appliances. The resulting fire
cost a friend over $10K to repair and replace damaged appliances.
If wired Ethernet seems to be the way to go consider the Orange Pi Zero - about
the cheapest wired Ethernet board available that runs Linux. Ethernet is via
on-chip MAC and phy, so no USB path delays.
http://www.orangepi.org/orangepizero/
Plenty of support exists on the web, for example:
https
Looking at the datasheet I'd expect finding a drop-in replacement is likely
problematic. A rather involved RTC module providing seconds out to 100 years.
(Although it looks a lot like a Seiko RTC chip I used in the late 70s.)
Emulation would probably require an FPGA approach, or one using a 2-p
You might want to consider an LED digital wall clock. I have a homebrew LED
clock that's going strong after some 46 years of continuous 24/7/365 operation.
The MM5314 is even a packaging reject unit I grabbed when it was a brand new
design and I was a mere co-op engineering student working at th
s actually offended by your post.
respectfully,
Robert LaJeunesse
> Sent: Tuesday, July 09, 2019 at 6:26 AM
> From: "ew via time-nuts"
> To: time-nuts@lists.febo.com
> Cc: ew
> Subject: Re: [time-nuts] Advantages of GNSS ???
>
> Dana
> This was in response to Mark Sin
Chris, better to set your SA to 5 MHz span with 2.5MHz center. Adjust the input
attenuator (start with lots of attenuation) until the 995 kHz peak is just
less than the always present peak at zero frequency. (Namely always keep zero
Hz at the left side of the screen, or to the left of that so i
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 strays,
FWIW there exists an online reference for SX BASIC at
http://www.piclist.com/techref/parallax/sxb/sxb/___index.html which may prove
helpful in understanding the SX-B code.
Unfortunately I can not find the SX-B BASIC compiler online anymore.
http://www.parallax.com/sx/sxb.asp is 404.
Bob L.
>
I would appreciate it, thanks.
Bob LaJeunesse
> Sent: Saturday, August 18, 2018 at 3:22 PM
> From: "Dan Rae"
> To: time-nuts@lists.febo.com
> Subject: Re: [time-nuts] History Channel "In Search of" Time Travel
>
> If anyone wants to see this I could upload a .mkv copy to Wetransfer for
> downlo
I'd say it does get more detailed, with the $49M in cuts described generally in
groups here:
https://www.nist.gov/director/fy-2019-presidential-budget-request-summary/fundamental-measurement-quantum-science-and
One item: "-$6.3 million supporting fundamental measurement dissemination,
including
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