[time-nuts] BG7TBL GPS Disciplined Source

Bob Camp kb8tq at n1k.org
Mon Mar 14 16:14:18 EDT 2016


Hi

It’s not just a Russian OCXO, it’s a Russian OCXO that has been through a very nasty salvage process. It is rare to find one that is in very good shape after the “gentle hands” have removed it from the original equipment. 

Bob

> On Mar 14, 2016, at 2:52 PM, Gedas <w8bya at mchsi.com> wrote:
> 
> 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
> Light travels faster than sound....
> This is why some people appear bright until you hear them speak.
> 
> 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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