[time-nuts] BG7TBL GPS Disciplined Source

Gedas w8bya at mchsi.com
Mon Mar 14 14:52:37 EDT 2016


Hi Hal, and TU for the reply. Tu also to everyone else with the very 
helpful hints and info.  Following the advice of Joe I checked out the 
EEV Blog site.....very good information about the different variants of 
this maker.  Turns out, because I have a model (date code) of 2014-12-09 
that it corresponds to this revision and information:

custom board with surplus russianmorion mv89 
<http://www.morion-us.com/catalog_pdf/MV89.pdf>OCXO. gps isu-blox 
NEO-6M-0-001 <https://www.u-blox.com/en/product/neo-6-series>.

Who would have guessed a Russian OCXO.  And, I guess the U-Blox is not 
one of the better GPS units based on what Paul mentioned.  But I think 
there is software out there that will let me at least monitor what my 
unit is doing and how many birds it is receiving data from. I also have 
the 8-port signal splitter which is nice as I can now run my reference 
to all my various TE.

Oh well, it is what it is as I do not have the money to purchase a 
different one. To answer your question I am using the supplied "hockey 
puck" style antenna placed outside my basement window well, sitting on a 
small wooden shelf, but close to ground level.  The antenna should have 
a clear view from 90-280 degrees, from an elevation angle of 0-90 
degrees.  Anything from West to North to East (~280-90 degrees) is 
blocked by the house.  I guess my next step, as Bob suggested will be to 
install some monitoring software to see how many birds I am able to see 
on average.

Gedas, W8BYA

Gallery at http://w8bya.com
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On 3/14/2016 12:55 AM, Hal Murray wrote:
> w8bya at mchsi.com said:
>> This is where I really embarrass myself.....sometime ago I purchased an
>> inexpensive 10 MHz GPS based reference source (BG7TBL GPS Disciplined
>> Source) for my various counters, transceivers, spectrum analyzers, etc  and
>> was wondering if it was a good purchase and if anyone else used a  similar
>> unit.  I guess in the end I am curious to know what the short &  long term
>> accuracy and stability of my unit may be?  I no longer have  access to any
>> accurate (known) frequency sources like I did while  employed and I do not
>> think I have the equipment here at home to measure  my unit myself.
> Long term accuracy will be very good - you are tracking GPS.
>
> You didn't say anything about your antenna.  That's probably the major
> contributor to your short term accuracy.
>
> Google found:
>    http://www.eevblog.com/forum/testgear/bg7tbl-gpsdo-master-reference/
> Looks like there are various versions.
>
>



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