[time-nuts] Anyone have a comparison of the Z3805A and a Tbolt?

Bob Camp lists at rtty.us
Tue Sep 7 11:34:31 UTC 2010


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" <xyzzypdx at gmail.com>
Sent: Monday, September 06, 2010 6:14 PM
To: "Discussion of precise time and frequency measurement" 
<time-nuts at 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 <lists at 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 <swingbyte at 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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