Bob,
I wonder if you are really talking about Z3805A's?
I know the double-oven version of 10811's were in the earlier Z3801A's;
never heard of one in Z3805A. I have a Z3816A and a Z3805A. They both
have MTI 260-model 5 MHz oscillators. I assume that is the "better" one
you are referring to. My Z3805A is marked Samsung, as are all the ones I
see coming from China.
The current price seems to be more like $350 than $250 for the ones
left. I think $350 is about what I paid for my Z3805A a bit over a year,
or so, back.
-Rex
On 9/7/2010 4:34 AM, Bob Camp wrote:
Hi
The "bad units" with the 10811's in them are usually marked "HP". The
"good units" with the true DOCXO in them are normally marked
"Symmetricom".
Bob
--------------------------------------------------
From: "Pete Lancashire" <xyzzy...@gmail.com>
Sent: Monday, September 06, 2010 6:14 PM
To: "Discussion of precise time and frequency measurement"
<time-nuts@febo.com>
Subject: Re: [time-nuts] Anyone have a comparison of the Z3805A and a
Tbolt?
Is there an external way on the 3805's to id the desired 10811 ? S/N
or ?
Ditto on the 10811's
-pete
On Mon, Sep 6, 2010 at 11:31 AM, Bob Camp <li...@rtty.us> wrote:
Hi
I have a couple 3805's and more than a couple TBolts.
There are two 3805's, one has the double heated 10811 the other has
a true
double oven. The true double oven / later design is the one you want.
Typically they have better TC and better ADEV at 10 seconds compared
to the
earlier part.
The TBolt has a much better GPS receiver in it and it is far more tweak
able with the Lady Heather software. It's default settings are not
as good
as the defaults on the 3805. With some work they can be vastly
improved.
The 3805 runs on a single 24 or 48 volt supply depending on the
model you
get. The TBolt needs +12, +5 and -12. Battery backup is easier on
the 3805.
TBolts run $75 +/- 25. 3805's run $250 +/- $50. Shipping will be a
bit more
on the 3805.
The TBolt wins in bang for the buck and fun to tweak categories. The
3805
is the better plug it in and ignore it forever box.
Both will track a cesium well at 100,000 seconds and beyond. Both
look a
lot like GPS at 100 seconds or so. Both have some significant
variation unit
to unit.
Bob
On Sep 6, 2010, at 11:13 AM, swingbyte <swingb...@exemail.com.au>
wrote:
> Hi All,
> Have been thinking of getting a GPSODO and I'm looking for advice
on > what
to choose. I haven't been able to find an ADEV comparison between
these two
units and am curious to know how their differences manifest themselves.
Apart from the 12 satelites vs 8 what practical advantages are
there in the
3805A over the Tbolt? With all the extra components there has to be
something. I notice that the ocxo is not the large Docxo of the
3801A -
which is better?
>
> Thanks
>
> Tim
>
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