I can buy them here in Japan, made by a company called Sunhayato.
Manufacturers link:
https://www.sunhayato.co.jp/material2/afp02/item_598
Store link:
https://www.sengoku.co.jp/mod/sgk_cart/detail.php?code=7ANT-L5H3
Seems like Elematec are the ones who might distribute Sunhayato stuff in the
Hi
At some point you must go “inside” the loop (or your OCXO isn’t locked …). At
that
point, you run into the basic physics of frequency multiplication.
Bob
> On Nov 30, 2021, at 7:16 PM, Matt Huszagh wrote:
>
> Jürgen Appel writes:
>
>> Yes, this is a fundamental physical property which
Drops in a hole in the PCB. I doubt that you could buy that exact one, it is
unusual and probably custom. Pin terminals and fork terminals are much more
common. The closest I could find to the pictured one are from Cambion
Electronics, which has (smaller diameter) hollow PTFE insulated
Hi
Guessing at what you are looking at:
Try to look for "teflon standoff" on Google…..
Bob
> On Nov 30, 2021, at 7:19 PM, Hal Murray wrote:
>
>
> lajeune...@mail.com said:
>> Judging from the teflon solder cup used I suspect insulation resistance is a
>> critical parameter.
>
> Could
On 1/12/21 5:03 am, Jared Cabot via time-nuts wrote:
Hopefully I can find something in Akihabara
Yeah yeah, don't rub it in! :^)
___
time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an
email to
Jürgen Appel writes:
> Yes, this is a fundamental physical property which cannot be avoided.
>
> You can see it that way: If there is a given fluctuating time delay in your
> otherwise perfect 5 MHz signal, the amount of phase shift this time
> fluctuation corresponds to in a 10 MHz signal
lajeune...@mail.com said:
> Judging from the teflon solder cup used I suspect insulation resistance is a
> critical parameter.
Could somebody please give me a lesson or pointer or ...
I noticed something interesting in the picture. Is that just a ring on the
surface, or a part that drops
I can see a handful of them in my ntp leap second monitoring data.
https://www.maths.tcd.ie/~dwmalone/time/leaps/ntp2021Nov-leapbits.png
The regular data for June and December is here:
https://www.maths.tcd.ie/~dwmalone/time/leaps/
David.
Did you take a picture showing where the thermal fuse is located? I've never
opened a 10811.Sounds like a crude device as you described it. I've used
thermal fuses as a safety feature for fast-recharge medical NiCd battery packs
but those looked like big diodes.LarrySent via the Samsung Galaxy
Hi
The thermal fuses die on their own far more often than they die protecting
anything. The fuse is there to provide safety is certain odd situations. The
simple answer these days is to replace it with a piece of wire.
Bob
> On Nov 30, 2021, at 12:05 PM, Larry McDavid wrote:
>
> Do these
Yes the fuses can just fail like any fuse. But with the oven it pays to
very carefully insure they didn't fail because of temp. and that they did
there job.
Regards
Paul
WB8TSL
On Tue, Nov 30, 2021 at 1:09 PM Dan Rae via time-nuts <
time-nuts@lists.febo.com> wrote:
> On 11/30/2021 7:19 AM, Bob
On 11/30/2021 7:19 AM, Bob kb8tq wrote:
Hi
Quick and dirty way to check the oven is to monitor current. It should start out
near the max rated power and drop back after a few minutes.
And it's worth checking the thermal fuse, which I've had fail in a lot
of them.
Dan
I was reading in a past thread on the time-nuts mailing list that the thermal
fuses can occasionally spontaneously go open circuit with age, far more often
than going open due to a real thermal fault.
(I wonder how many have been discarded over the years due to this issue?)
They appear to be
Do these thermal fuses fail spontaneously or is there a common cause?
If the "heater" transistor mounting screws were quite loose, those
transistors themselves might have overheated and failed. But, a thermal
fuse should fail by high temperature...
Sounds like progress, though. Cold OCXO
Hej,
On Monday, 29 November 2021 04:29:58 CET Matt Huszagh wrote:
> I've got a 10 MHz distribution amplifier and am considering purchasing a
> 5 MHz reference. Most (not all) of my equipment accepts a 5 MHz
> reference, but I'd like to be able to use the existing distribution
> amplifier I have
Well, I found it, the thermal fuse is open circuit.
If I briefly bypass it with a jumper wire, the oven pulls the expected current.
Looks like I need something that will trip at roughly around 115C, rated to 1.0A
(HP Part number 10811-80008)
Hopefully I can find something in Akihabara to make it
This is written at 2021-11-30 15:45
2021-11-27 00:00:00 NTP servers start advertising leap=1.
2021-11-28 00:00:00 Many of these servers execute leap procedure. Leap=0
no longer advertised (mostly)
2021-11-30 00:00:00 *Another set of NTP servers start advertising leap=1.*
2021-12-01
That film cap does look a little cooked. Since it is a 2uF 20% 50V part a more
common 2.2uF 10% 63V part would likely be an acceptable substitute, and
basically still within overall tolerance. Judging from the teflon solder cup
used I suspect insulation resistance is a critical parameter. Be
Folks working at KPH, RCA’s coastal marine radio station at Pt Reyes,
California, asked the following question recently:
It has been noticed that on (RCA) Radiomarine Corporation of America radio
crystals that they have a type on the case. Some of the types noted are R1, R2,
R5, RC-2A and
Hi
Quick and dirty way to check the oven is to monitor current. It should start out
near the max rated power and drop back after a few minutes.
Bob
> On Nov 30, 2021, at 9:36 AM, Jared Cabot via time-nuts
> wrote:
>
> Ok, so I carefully dismantled the OCXO and I may have found the
It's only a 4 hour drive for me, so I seem to have a $400 advance :-),
tempting. I've always wanted a HP5072.
Many, many years ago, I got very far getting my HP5065 working, thanks to the
very knowledgeable people in this list.
Is it a common or well known failure mode, 9.2GHz PLL test fail?
Ok, so I carefully dismantled the OCXO and I may have found the culprit... The
screws holding the two transistors to the metal body were both less than finger
tight!
Don't know how that happened, so they were cinched up to 5in-lbs with the
torque screwdriver as per the service manual, and I'll
The answers are the same that I have add a backup battery off board.
However I do something just a bit different. I use 2 X AAA batteries in a
holder external to the box. For easy inspection, voltage checks and super
easy battery exchange.
Save deracking and such. (Lazy)
Good luck
Paul
WB8TSL
On
Your push-pull doubler is much nicer than my full-wave rectifier with
Schottky diodes
http://g4jnt.com/10MHzDist.pdf
Andy
www.g4jnt.com
On Mon, 29 Nov 2021 at 15:42, Wilko Bulte wrote:
> For those interested, Dave PA5DOF and your's truly are working to get the
> doubler implemented that
Off-board battery back up on these old receivers is easy as the back
up battery supply pin takes very little current. I usually used a
non-rechargeable lithium coin cell.
Keeping it separate from the GPS allows it to be easily disconnected
to clear the memory.
On Mon, 29 Nov 2021 23:06:31
- Original Message -
From: Poul-Henning Kamp
To: Discussion of precise time and frequency measurement
, k1...@att.net
Sent: Tue, 30 Nov 2021 02:43:03 -0500 (EST)
Subject: [time-nuts] Re: Oncore UT+ EEPROM -
k1...@att.net writes:
> I have an Oncore UT+ for a project and
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