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

David C. Partridge david.partridge at perdrix.co.uk
Tue Sep 7 12:04:57 UTC 2010


I'm having a problem with a sentence that contains "bad" and 10811 in proximity.  It sounds like an oxymoron.

Please could someone elaborate on why a 10811 OCXO in a 3805 is bad?

Regards,
David Partridge


-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf Of Bob Camp
Sent: 07 September 2010 12:35
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Anyone have a comparison of the Z3805A and a Tbolt?

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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