Tisha,
Magnus encouraged me to share my "Happy Easter" with you, or at least this
demo that's kinda like an easter egg:
https://www.youtube.com/watch?v=8MZpnVs6CWc
Enjoy, all.
On Sun, Apr 1, 2018 at 8:24 PM, Tisha Hayes wrote:
> Thanks to those who responded to my requests off-list for detail
Very true
Sent from my iPhone
> On Apr 3, 2018, at 7:51 PM, Bob kb8tq wrote:
>
> Hi
>
> If the objective is great phase noise far removed from carrier, there’s a
> gotcha.
>
> Let’s say you have a 10 dbm source at room and it’s broadband is at KTB of
> -174 + 1db.
> That gives you -183 db
Jim,
The Harrison google doodle is attached for those that missed it [1].
A couple of comments:
1) One alert reader pointed out that the clocks are stopped. Google is capable
of clever JavaScript animations, so the least they could do is have the clocks
in motion. It would be especially intere
Hi
If the objective is great phase noise far removed from carrier, there’s a
gotcha.
Let’s say you have a 10 dbm source at room and it’s broadband is at KTB of -174
+ 1db.
That gives you -183 dbc. You cool your oscillator to whatever and KTB goes down
to -194. You do a bang up job at that temp
Pieter
That is quite a surprise that a country is setting up a long wave system
these days. They still have to raise the money but it seems like a
semi-private arrangement. Even more interesting is they suggest 3
locations. Something to try to find in the VLF bands some day in the future.
Regards
P
On the practical side, the 5345 is HEAVY due to its older technology—doing
what it does with first-generation ICs required HP jam an enormous amount
of circuitry into a fairly small physical package.
Jeremy
N6WFO
On Tue, Apr 3, 2018 at 2:39 PM Bob kb8tq wrote:
> Hi
>
> I would add the HP 5335
NPL opens their doors to the public once every 2 years. It is well worth
going. Tickets are only 3.00 each, and that money is donated to a cancer
charity. More details at
http://www.npl.co.uk/open-house/
To make the most of it, you need to
1) Arrive early (14:00)
2) Leave when they close (20:00)
Hi,
Apparently India plans to build two longwave transmitters for a national
time signal service:
http://www.thehindu.com/todays-paper/tp-national/coming-huge-towers-to-publicise-right-time/article23377284.ece
No technical details such as frequency and modulation are given, nor whether
the carrie
Hi
I would add the HP 5335 to the list of counters to look for. The surplus market
can be really
weird. A 5334 *should* be less than a 5335, but on any given day, that may not
be true. The
5370 and 5345 are also worth looking for. Target price (at least for me) wold
be < $150 for a
quick buy a
Gary
There is a Blast from the past the PIC TIC. Richard McCorkle did it and in its
time was widely popular. He helped me on many projects so I included his boards
with my board orders. Not being a time nut I never took a closer look at his
board. Having recently revisited the subject for simple
g...@rellim.com said:
> With care I can measure GPS jitter on a RasPi to a bit over 300 nano sec
> resolution. That is the smallest increment of the RasPi 3B clock with a
> 64-bit kernel. That is clearly not time-nuts accuracy.
> What would you guys suggest as the cheapest way to see jitter dow
Hi Gary,
One solution is to look for used hp, Fluke, or Racal time interval counters on
eBay. 1 or 2 ns is pretty easy to find with a $100 or $200 budget. Look for
Racal 1992 or hp 5334B as examples. If you plan to collect lots of data, you'll
want GPIB (or RS232 / USB) connections to a PC and
Find a nice used 5370/5371? :)
There is a 5371 on ebay for $250 at the moment.
On Tue, Apr 3, 2018 at 1:47 PM, Gary E. Miller wrote:
> Time-nuts!
>
> With care I can measure GPS jitter on a RasPi to a bit over 300 nano sec
> resolution. That is the smallest increment of the RasPi 3B clock with
On Tue, 3 Apr 2018 10:47:37 -0700
"Gary E. Miller" wrote:
> What would you guys suggest as the cheapest way to see jitter down to
> around 1 nano second?
Look at Nick Sayers GPSDO and his interpolator. You wont get any
cheaper than that. Next best thing is to use a TDC7200 like in
the TICC.
O
Hi Mark:
When Aetech started to make their own Tunnel Diodes there was a problem with
the neck breaking.
Note they were made by alloying a ball of metal onto a highly doped chip, bonding from the lip of the ceramic package to
the ball then on to the opposite lip, then etching the chip away leav
Time-nuts!
With care I can measure GPS jitter on a RasPi to a bit over 300 nano sec
resolution. That is the smallest increment of the RasPi 3B clock with
a 64-bit kernel. That is clearly not time-nuts accuracy.
What would you guys suggest as the cheapest way to see jitter down to
around 1 nano
Does anyone have any nuts and bolts (disassembly?) experience they can share
regarding fixing a Datum 1000B pn 05818-115 (4x10MHz) which has a manual
frequency pot and which will not adjust to 10,000,000.000 MHz? It will
actually go as low as “10,000,000.2890”, but no lower. (The unit does not
Many years ago, circa 1977, I was moved to try some crude tests on a few
semiconductor devices at LN2 temperature (77K).
These tests were very crude, involving dunking the parts into the LN2 bath,
and
many failed outright. Most of the devices tested were in plastic packages.
Here are the results
Hi
> On Apr 2, 2018, at 11:18 PM, jimlux wrote:
>
> On 4/2/18 1:39 PM, Hal Murray wrote:
>>> If not Nitrogen, how about dry ice (-109F -78C)?
>> Dry ice is relatively easy to get. It wouldn't be hard to try a quick
>> experiment.
>
>
> CTE mismatch in packages will be a significant problem -
Yeah, that's pretty much the story around the country. I also have some
monitoring software (monitoring PSIP, video and audio data, not
specifically for monitoring STT packets) that I run on the Denver and
Cheyenne stations 24 hours a day. Very few have set their GPS-UTC offset
to 18 seconds.
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