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, an
official tube is likely a way non starter. Friend seemed to think there were
"other" sources for tubes, but I am rather pessimistic.
What do you think? Is this thing junk? I would hate to scrap it. Maybe
use it to house a GPSDO.
Link
On Jun 12, 2015, at 6:55 AM, Cube Central <cubecent...@gmail.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:
>
>>> "Here is what I have been able to do with a Motorola Oncore UT+ that I got
>>> from Bob Stewart awhile back. This is with a Raspberry PI 2 with a number
>>> of tweaks and a custom compiled kernel. Nothing too drastic... plus the
>>> current Dev version of NTP compile on the Raspberry PI."
>
> What tweaks? What options have you compiled? What are the gritty details of
> your setup?
>
>>> "I'm getting better results letting ntpd discipline the clock over doing
>>> kernel discipline...
> not surprising because the algorithms in the ntpd code are much more
> sophisticated than the Linux kernel pps code... ntpd discipline provides much
> lower jitter in my experience."
>
> what setting is this and how might I go about experimenting with it? Is that
> the "flag3" option in the "Generic NMEA GPS Receiver" documented here?
> https://www.eecis.udel.edu/~mills/ntp/html/drivers/driver20.html
>
> <snip>
>
>>> "Not too shabby for a killer deal on an Oncore UT+ for $5 from Bob! I'm
>>> running the PPS out of the UT+ through a level converter to get the ~3.3v
>>> PPS output... the serial output on the UT+ is also going through a level
>>> converter direct into the Pi 2. Using the oncore 127.127.30.0 ntpd driver
>>> and again, i'm not using hardpps kernel discipline."
>
> I see word HARDPPS in the driver you mentioned
> (https://www.eecis.udel.edu/~mills/ntp/html/drivers/driver30.html ) but that
> documentation is a bit scarce... Could you fill me in on how you have it set
> up? Is the PPSAPI also used for the "Generic NMEA GPS Receiver" (driver 20)
> or the PPS driver (driver 22)?
>
> Thanks so much for your assistance! Sorry if these questions have been
> posted before, but I am very curious about your setup as it nearly matches
> mine!
>
> -Randal "r3" of CubeCentral
>
>
>
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