Luciano,
I have found that "selected" 10811 units will offer significantly better
short term stability as a stand alone or open loop oscillator over the
105 style oscillator. (Mid parts in 10-13th from 1 to 100 Seconds)
However with the 5065A locked the performance will be driven by the loop
and
Hi
HP 10811’s vary over almost a 100:1 range in terms of ADEV performance at short
tau. The standard model is un-sealed so it has some issues
with humidity when it is in storage for a long time. In both the case of the
10811 and the 105, their stability will improve as they are
on power. In th
here the ADEV of the two oscillator. I have added the Super performance of an
HP105B (old oscillator) bought in an Ham fest.
Luciano
On Fri 07/08/15 03:37 , Bob Camp wrote:
> Hi
>
> HP 10811’s vary over almost a 100:1 range in terms of ADEV performance
> at short tau. The standard model is
Hi Corby,
I agree with you that if selected, there may be many differences between
objects of the same type. Unfortunately it is very difficult to know what is
selected and what is not. For example I found a 10811 mounted in a Z3801A who
have the temperature set-point completely wrong. I r
ncy measurement"
Sent: Thursday, August 06, 2015 8:37 PM
Subject: Re: [time-nuts] HP10811 vs 00105 OCXO
here the ADEV of the two oscillator. I have added the Super performance of an
HP105B (old oscillator) bought in an Ham fest.
Luciano
On Fri 07/08/15 03:37 , Bob Camp wrote:
> Hi
&g
Hi
If that data is correct, then the 10811 you have is defective.
Bob
> On Aug 6, 2015, at 11:37 PM, tim...@timeok.it wrote:
>
>
> here the ADEV of the two oscillator. I have added the Super performance of an
> HP105B (old oscillator) bought in an Ham fest.
>
> Luciano
>
>
>
> On Fri 07/0
Hi
The outer oven in the 3801 was put there for a very specific purpose:
When the 3801 was designed, they had a target specification that included a
warmup from -40C.
The 10811 was never designed to work at these temperatures and simply could not
meet the
required warmup time.
The “solution”
In message <55454.1438931...@timeok.it>, tim...@timeok.it writes:
> For example I found a 10811 mounted in a Z3801A who have the
> temperature set-point completely wrong.
The "turn-over" temperature can shift rather dramatically if the
X-tal is subjected to large mechanical shocks. T
Hi Luciano. That is interesting. Thanks for sharing this.
I also have an HP105B with the old style oscillator. (An auction site purchase
from years ago.) Yours seems at bit better than the one I have at tau's of
approx 100 seconds or so. I'm curious if you have any data for longer tau's ?
> Hi
>
> If that data is correct, then the 10811 you have is defective.
> Bob
Well... some of the data is reasonable for a scenario where a counter is being
used to measure OCXOs.
Looking at the ADEV plot, I'd say the blue trace (HP105B vs 5065A) is the most
questionable one if it came from
Hi
Well an un-stated assumption of mine was that they all came from the same
measurement system and that it
had the same floor under all circumstances….
Bob
> On Aug 7, 2015, at 5:21 PM, John Miles wrote:
>
>> Hi
>>
>> If that data is correct, then the 10811 you have is defective.
>> Bob
>
Hi all,
I try to ansver to all you:
Luciano, how was the blue trace taken? Is this from your DMTD project? If so,
it's looking promising.
The green and magenta traces are definitely in the right ballpark for
measurements on a 5370-class counter. At 3E-11 @ t=12s the magenta trace is
optimistic
Hi
Ok, so John’s observation was the correct one. The data we are looking at is
*not* the
performance of the OCXO’s but the strange behavior of the counter at short ADEV
Tau’s.
Sorry for my bashing your poor 10811.
Bob
> On Aug 8, 2015, at 12:25 PM, tim...@timeok.it wrote:
>
> Hi all,
>
>
How good or bad is the 10811 and which one on ebay is a better choice ?
I am looking for a very goo 5 MHz crystal oscillator with documentation .
Thanks, Ulrich N1UL
In a message dated 8/8/2015 7:16:37 P.M. Eastern Daylight Time,
kb...@n1k.org writes:
Hi
Ok, so John’s observation w
Hi
All 10811 OCXO’s have 10 MHz 3rd overtone SC cut crystals in them. They are the
first commercial (as opposed to military) OCXO to use the SC. The target was
good
phase noise rather than good short term stability. They did quite well for the
era in
terms of phase noise.
Back then and now,
Ulrich,
If you're interested in a very good 5MHz OXCO, then I recommend the MTI
Milliren model 260. (see Ebay #
271915776504). The data sheet is available.from several places, including
MTI's site. The daily aging rate for it is spec'ed at 5e-11, thermal
stability is 2e-10 over -30C to +70C. T
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