We have operated about 40 PRS10s over the past 20 years or so. These are
all run continuously in benign environments and monitored via GPS
time-transfer . Some have died after just over a year; others have operated
for more than 12 years. A new one generally takes a few months to burn in,
before
Hi Jim:
When I was working in Semiconductors we used a fluorocarbon liquid in a heated fish tank first. If bubbles come out you
have a "gross" leak. After that we put a whole bunch of parts in a 5 gallon paint pot and pressurized it with He and
let them soak. Then a small number of parts
Alternatively, buy a suitably spec'ed BMS PCB from your favourite online parts site and
populate it with 18650 batteries recycled from "dead" laptop battery packs.
Total cost will be in the double digits.
On 9/03/19 11:14 AM, Bob kb8tq wrote:
Hi
For 100 to 120 AH at 13.4V you will pay in
On 3/8/19 1:41 PM, ew via time-nuts wrote:
A123 7Ah "brick" LiFePO4 who is the vendor?Bert Kehrren
Here's one source
https://www.buya123products.com/goodsdetail.php?i=1
ALM12V7 is what we were using, and yowza, the price went up $265 each..
Amazon has them for $140 which is closer to
There was discussion last October about the very tiny MEMS oscillators
failing from He leaking in. By now, there's several videos online
showing folks taking that MEMS oscillator and putting it in a chamber
and demonstrating the failure.
So here's something interesting - There are a
PTS have always been notoriously unhelpful to anyone aside from original
purchasers.
Around 15 years ago I was looking for a PTS160 manual and the UK agents were
very helpful, and quite happy to request a price on my behalf, but then came
back to tell me they'd been told by PTS they couldn't
On 3/8/19 1:41 PM, ew via time-nuts wrote:
A123 7Ah "brick" LiFePO4 who is the vendor?Bert Kehrren
A123 was the vendor (they're the mfr)
I just googled, and it looks like there's now several authorized
resellers of the batteries.
___
On 3/8/19 15:41, ew via time-nuts wrote:
> A123 7Ah "brick" LiFePO4 who is the vendor?Bert Kehrren
I sent this information several days ago. I guess my message never posted.
Check with Bioenno Power:
https://bioennopower.com
This may be a drop-in replacement:
Hi
For 100 to 120 AH at 13.4V you will pay in the $900 to $1000 range (delivered)
for the RV
batteries with built in BMS. Capacity / price / current sale deal vary a bit
manufacturer
to manufacturer. Warranty also varies from <1 year to 10 years …..
Bob
> On Mar 8, 2019, at 2:32 PM, jimlux
A123 7Ah "brick" LiFePO4 who is the vendor?Bert Kehrren
In a message dated 3/8/2019 4:03:53 PM Eastern Standard Time,
jim...@earthlink.net writes:
On 3/8/19 5:38 AM, Bob kb8tq wrote:
> Hi
>
> If you are headed into a “cost is no object” sort of battery backup bank for
> the lab / shelter
> A PRS10 with a long shelf life will need more than 10 months (not days !) to
> get its final drift. Its dépends of the homogeneity of the gas mixture
> (Rb85,87 and krypton) in the cell and a long non running time affects the
> mixture.
What's going on there?
Why/how does the mixture change?
On 3/8/19 5:38 AM, Bob kb8tq wrote:
Hi
If you are headed into a “cost is no object” sort of battery backup bank for
the lab / shelter / cave
there are some interesting options out there. The RV world is very slowly
waking up to the fact that
big heavy lead acid batteries may not be ideal. For
A PRS10 with a long shelf life will need more than 10 months (not days !) to
get its final drift. Its dépends of the homogeneity of the gas mixture (Rb85,87
and krypton) in the cell and a long non running time affects the mixture. After
the end of this warm up period, adjustement is time
今日は
On Fri, 8 Mar 2019 14:09:20 + (UTC)
Taka Kamiya via time-nuts wrote:
> Why? Because nature of GPSDO and Rb, time constant is set to 2 to 3 hours.
> (still experimenting) It takes few cycles of this to lock and stabilize. In
> short, you'll be safe if you wait 24 to 48 hours. Rb
Hi
If you are headed into a “cost is no object” sort of battery backup bank for
the lab / shelter / cave
there are some interesting options out there. The RV world is very slowly
waking up to the fact that
big heavy lead acid batteries may not be ideal. For a ghastly amount of money,
you can
On Fri, 8 Mar 2019 06:31:48 -0600
Dana Whitlow wrote:
> The point here is that there are apparently a number of warm up drift
> mechanisms operating, some of which take days to sensibly settle down.
Longer. I know of one measurement, where the Rb had a kind of stable
drift until it suddenly
Hi
> On Mar 8, 2019, at 7:47 AM, Attila Kinali wrote:
>
> On Fri, 8 Mar 2019 01:18:45 -0700
> "Forrest Christian (List Account)" wrote:
>
>> 1) Assuming the PRS-10 has been off for a long time, how long should I
>> plan on leaving this on for the 10Mhz to stabilize? I see the
>> longest
I had a recent email exchange with PTS. I have a PTS 160 SK01G serial number 1A
8428. The output drops off rapidly below 70 KHz. It doesn’t match the manuals
available online as it has .1Hz resolution but without the number of DM modules
the manual says it should have. Instead it has a couple
I am experimenting with exactly the same thing. PRS-10 with Thunderbolt.
PRS-10 takes about a day to stabilize. When physics lock happens, it has
limited stability - which is mentioned in manual. Before I calibrated, I
waited for 2 days. These movements are visible if you feed GPSDO into
Keep in mind that the 7 min "warmup time" of the PRS-10 is jut the time for
the
unit to get the physics package close enough to final temperature for the
dithering
loop to lock to the atomic transition. But based on measurements of current
drawn
by the oven(s), it takes more like an hour for the
On Fri, 8 Mar 2019 01:18:45 -0700
"Forrest Christian (List Account)" wrote:
> 1) Assuming the PRS-10 has been off for a long time, how long should I
> plan on leaving this on for the 10Mhz to stabilize? I see the
> longest warmup time on the spec-sheet is 7 minutes - although this
> seems a
For my frequency stand alone setup opposite the rest of the lab I have a 100 A
12V AGM/Inverter/Resonsnt Transformer that will power the setup for 10 hours,
but like you I like remove the HP 5065A powered up. Did consider a similar
system for the HP 5061B but have not and most likely will not
> 1) Assuming the PRS-10 has been off for a long time, how long should I plan
> on leaving this on for the 10Mhz to stabilize? I see the longest warmup
> time on the spec-sheet is 7 minutes - although this seems a lot shorter than
> I'd likely use in real life, I'm also not sure if there's
Thank you for all the hints.
I did several experiments, but was not able to get reliable injection
locking, several times the crystal jumped some 10-20Hz down, and
stayed there.
Think I have decided to just remove the 10MHz crystal and drive the
oscillator from a external source.
BR.
Thomas.
Den
On 8/3/19 1:19 am, Don@True-Cal wrote:
> 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,
If you're willing to
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