Hal, what stopped me from going down the BBB path was the reports of RF
noise, they supposedly create a lot of noise. Not acceptable in an HF
environment. Google around about the RF noise with the BBB. mg NG7M
On Sat, Jun 13, 2015 at 12:02 AM, Hal Murray hmur...@megapathdsl.net
wrote:
Hi
At best, simply because of the way that USB interface works, you can go from
the ~1/2 ms range into the ~1/4 ms range. Rewriting the low level drivers may
be required. This compares to an equivalent lag on a device with a built in
ethernet of 0.001 ms. The easy thing to do is to simply
Hello time-nuts list members,
Part of this past week we have been experiencing a strange slowdown of the
febo.com out-going time-nuts mail list server. This has caused postings
(including this one?) to be delayed by hours, even tens of hours. We're still
trying to figure it out. Thanks
BG Micro has some nice 48V 2A power supply modules for around $12. IEC power
cord in (100-240V), 2.1mm barrel connector out. Seems to work well with my
Nortel GPSDOs, but I haven't scoped the thing out for noise, etc.
kb...@n1k.org said:
The very real question is still - which edge is correct?
Has anybody seen a GPSDO where the leading edge of a narrow pulse wasn't the
correct one?
--
These are my opinions. I hate spam.
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Thanks Mark - Here is the data sheet:
http://www.farnell.com/datasheets/1903642.pdf
John K1AE
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Mark Sims
Sent: Saturday, June 13, 2015 5:20 PM
To: time-nuts@febo.com
Subject: [time-nuts] Cheap 48V 2A power
Several time-nuts have asked about my setup, here are some details of what
I changed in the kernel and in the NTP build... Make sure and use the
default config for the Pi 2 CPU when setting up .config for the Linux
kernel. Make sure you are actually seeing your new kernel after you copy
it to
I just got a new (to me) HP 5370B and I wanted to try it out on the 1 PPS
output
from a Trimble Resolution T. Using 10K samples averaging it is always
about
6 or 7 nS to high. Shouldn't this average toward zero? If I use no
averaging
it bounces around within the expected range.
I have done
Hi
Of course tomorrow you will stumble into a “great deal” on a complete cell site
that needs a 9.8304 MHz clock :)
One thing to watch:
The pps you now have may or may not be deterministic in its relation to the
every other second output. It also may or
may not be in a fixed relation
Hello,
I'm guessing I all ready know the answer to this but:
A friend gave me a hp 5061b but in need a tube. Symmetricom was listing the
price of a replacement at 35k before the go bought out by Microsemi. Given
Microsemi has a tendency to rebrand equipment and then charge 4x the price,
Hello
It also depends on which device primitives you can use. Xilinx spartan
series has an SRL16, 16 bit shift register that can be ganged to form dividers
/ pre scalers. It only takes up one lut or slice, I forget which.
Link
On Jun 11, 2015, at 4:11 AM, Bob Camp kb...@n1k.org wrote:
Hi
Ignacio, I would very much appreciate a copy of whatever schematics you
have, even if it is not guaranteed to be 100% accurate
I agree with you that the 9.9804 Mhz is basically useless, while the
even second pulse is merely almost useless. However, as you have
apparently looked the board over
Hi Ed,
While your board is not exactly the same as mine I think that the
schematics are almost identical but the TPs and probably the chip names
has changed. I think that the main difference is that your unit can be
powered with -48 V or +24 V and obviously the parts layout has changed.
I
Hi
The whole “weird primitives” thing is why I try to count this stuff in
registers (flip flops) used rather than what ever neat name the marketing guys
came up with this week that sounds better than “glob of stuff”.
Bob
On Jun 12, 2015, at 11:44 PM, lincoln linc...@ampmonkeys.com wrote:
Hi Max! Thanks for the information, I was wondering if you had documented
what you did to your Raspberry Pi so that it might be reproducible to
someone like me (a newcomer time-nut and intermediate Linux user) ... you
had said:
[]
Thanks so much for your assistance! Sorry if these questions
I agree with you that the 9.9804 Mhz is basically useless, ...
Is it really useless?
How stable or clean is it? Would it be useful as the reference input to a
DMTD?
I believe the antenna cable feed delay is going to work in the wrong
direction here
Have you tried a negative number?
eds_equipm...@verizon.net said:
Is it possible to modify the kernel so the USB is polled more often, and
would that significantly reduce the jitter?
Modifying the kernel may not be enough if the timing parameters are in the
microcode for the USB device.
Whether any improvement is
Hi
On Jun 12, 2015, at 7:14 PM, Ed Armstrong eds_equipm...@verizon.net wrote:
Ignacio, I would very much appreciate a copy of whatever schematics you have,
even if it is not guaranteed to be 100% accurate
I agree with you that the 9.9804 Mhz is basically useless, while the even
second
Define 'needs a tube
Paul Swed and I have 5061's and both are way past what most would consider
needing a new tube.
Search the archives on what we have done. I power mine up every 4 months
and let it run for a few hours to a day. And
once or twice a year. Last year mine has run for a couple
Dead tube is a huge issue.At least for most of us finding a replacement
tube is zero especially at a cost that is reasonable. I speculate that
given the age of all 5061s pretty much all the tubes should be in very bad
shape. They only had a life of 7 years and we are many years beyond that.
I
Hi
We’ve had a cesium back for rebuild after the Microsemi merger. The price on a
tube is still in the same vicinity. If you ship the Cs back to them, they will
do a rebuild and drop the tube in. The price on that process is only firm once
they see the actual device. So far our rebuilds all
Hi,
I just finish the mod. It was easy, I cut the trace between TP14 and
U405-6 and soldered a wire between TP14 and TP33. Now I have a pretty 1
PPS on J5, the old 9.8304 MHz output. The signal has 0-5 V levels,
normally high with a 10 us pulse going down. In my unit this pulse
leads the
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