Hi All
As of 09:40 BST, 13th July, 29 of the 32 available 74AC175PCs have been
spoken for, assuming all who've expressed an interest go ahead.
As far as I'm aware I've confirmed directly with all who have so far asked
to be included.
If you've emailed me and not yet had a reply please tr
Antonio,
attached is a recording of my Z3805's EFC along July 11. Times are in UTC.
Best regards
Ulrich
> -Ursprungliche Nachricht-
> Von: time-nuts-boun...@febo.com
> [mailto:time-nuts-boun...@febo.com] Im Auftrag von iov...@inwind.it
> Gesendet: Montag, 12. Juli 2010 22:19
> An: time-
Ulrich
not having a 3805 can you please explain the scale.
Thank you
Bert Kehren
In a message dated 7/13/2010 6:12:47 A.M. Eastern Daylight Time,
df...@ulrich-bangert.de writes:
Antonio,
attached is a recording of my Z3805's EFC along July 11. Times are in UTC.
Best regards
Ulrich
>
Bert,
lacking a 3805 manual my guess is that the 3805 EFC scale may be considered
the same as the 3801's one. Which would lead to the conclusion that 1 EFC
unit equals roughly 1.0E-12 of relative frequency change of the LO.
Symmetricon seems to have believed that the MTI 260 type double oven OCX
Ulrich,
What software do you use to monitor your 3805A and how do you connect to it?
Joe
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Ulrich Bangert
Sent: Tuesday, July 13, 2010 7:05 AM
To: 'Discussion of precise time and frequency
Ulrich,
thank you for the info. I think that 2 E-10 per dayis the best argument
for any Rubidium.
Bert
In a message dated 7/13/2010 8:05:25 A.M. Eastern Daylight Time,
df...@ulrich-bangert.de writes:
Bert,
lacking a 3805 manual my guess is that the 3805 EFC scale may be considered
the s
Joe,
it is called Z38XX and is a windows tool which can be used to monitor the
whole Z38 family where its name comes from. I wrote it about a year ago. You
can download it free from
http://www.ulrich-bangert.de/html/downloads.html
It connects direcly to the Z3805's RS232 connector via a null-mod
Bert,
I am really unsure whether the drift alone should make me think that the
parts are bad. If the drift can be modelled well by the regulation loop (and
the Z3805's software seems to do so) it can well be compesated for.
Unfortunately even here is no real expert for MTI stuff who could tell us
Hi Guys,
In Australia some Ce units have hit the surplus market. looks like they
are from the 70s - that's 40 years old now. What does the group think
the probability of the tubes having any Ce left in them and still
working? Is it worth it now when one can use gps clocks to lock say an Rb?
I would guess it revolves around the cost.
Impossible to say if any CS is left. But for cheap it may be worth trying.
But then shipping will most likely get you.
I do agree GPS locked RB is a very nice way to go. At least in the US
various RB references much newer in age with possibly more life sho
Hi All
As of 17:07 BST, 13th July, all of the 32 available 74AC175PCs have been
spoken for, assuming all who've expressed an interest go ahead.
If anyone drops out I'll post accordingly, otherwise will contact those on
my list again once I have the ICs to hand and have confirmed delivery
Hi
It's quite possible that they have been re-tubed three or four times
already. That makes the estimation process pretty tough.
Pay for them as if they were dead, feel good if you get a working one. Don't
feel bad if you get out-bid...
There are indeed things that a Cs can do that a GPS locked
Hi
The 260 in my z3805 also has a very linear drift plot. Mine is positive, but
otherwise a lot like the one you show. The plot in both cases indeed
remarkably linear. That makes you wonder just what the mechanism is.
Since they market the 260 as a "rubidium replacement" it is indeed
surprising
On 07/13/2010 06:25 PM, Bob Camp wrote:
Hi
The 260 in my z3805 also has a very linear drift plot. Mine is positive, but
otherwise a lot like the one you show. The plot in both cases indeed
remarkably linear. That makes you wonder just what the mechanism is.
Since they market the 260 as a "rubid
Hi all,
Just a reminder that I'm going to place an order for the PICTIC PIC chips
tonight for those in the USA that want them. The price is $10.00 for the
first one, $2.50 for each additional, including shipping and programming.
1 would be $10.00 even, 3 would be $15.00, etc.
You can PayPal me a
Hi
I noticed a HP 5061A in Australia with a patek-philippe clock movement on
ebay. The clock will be worth some thing, even if the tube is bad! May
compensate for the risk you take.
Bert Kehren
In a message dated 7/13/2010 12:19:58 P.M. Eastern Daylight Time,
li...@rtty.us writes:
Hi
It
I have suffered greatly from 'CS Addiction' since becoming a time-nut. I
have purchased a total of 7 5061A's and 2 5061B's that were complete and 2
additional 5061A's for parts, one of which is missing only the tube and the
other missing various components including the tube. I have been able to
Learning about the differences between families now know why a 74F is not a
substitute for 74AC.
But remembering something I read in Brooks Shera, W5OJM GPSDO notes "Take care
about which 4046 chips you use for U1 and U3. The Phillips 74HCT4046 chips
(formerly sold by Radio Shack) are fine. So
Hi
Without plugging them into a board, you'll never really know which one is
better.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Stanley Reynolds
Sent: Tuesday, July 13, 2010 3:31 PM
To: time-nuts@febo.com
Subject: [time-nuts]
> I understand that you received some negative feedback on your ripple counter
> divider circuit but a single resync flipflop on its outputs in front of the
> AC04 drivers will do the job.
I think it's (much?) more complicated than that.
The basic problem is that the 74LS90 is very very slow. W
Thanks Ulrich
2 E -10 seems high and a straight line on a double oven is what I would
expect, looking at a month or two may tell more. Also what is the change in
ambient temperature? With Rubidiums in the less than $100 range I think it
is the best bang for a buck.
I am still waiting for th
Hello !
I know I'm a bit late, but is it still possible to order three boards,
and have shipped to Canada ?
I can program my own PIC's and have access to 74ACT175.
Also, I would be willing to program chips for other Time Nuts if it can
help someone.
Thanks !
Claude
__
Claude,
No problem you are on the list, the 74AC175PC is correct chip, not 74ACT175PC.
Stanley
- Original Message
From: Claude Houde
To: time-nuts@febo.com
Sent: Tue, July 13, 2010 8:15:25 PM
Subject: [time-nuts] PIC-TIC boards
Hello !
I know I'm a bit late, but is it still possibl
Just a follow-up on this.
Yesterday I received a Thunderbolt from fluke.l,
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=290322053618
This worked straight away and has cured the 50 minute drift
cycle. I'm getting a standard deviation of pulse interval of
about 0.25uS, as measured against
Probably none, since Fairchild inherited that product line from National
Semiconductor.
Regards,
Javier, EA1CRB
El 13/07/2010 21:30, Stanley Reynolds escribió:
Learning about the differences between families now know why a 74F is not a
substitute for 74AC.
But remembering something I read in
> It ought to be a bit better than this, but the 10uS PPS width is a bit too
> short for a steady timing of centroid through a soundcard at 192k samples/
> sec, I need to stretch the pulse a factor of 10 or so.
The PPS on my TBolt was also too short for a PC running Linux/ntpd to catch
it. (It
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