[time-nuts] 58536A splitter and 9390-6000 GPS

Robert Watzlavick.com rocket at watzlavick.com
Fri May 20 12:55:58 UTC 2011


I thought the 58536A was supposed to provide a load to the other receivers for that reason. But now that I look at the datasheet more closely, that feature may only be available for the 58537. 

-Bon

On May 20, 2011, at 7:25 AM, paul swed <paulswedb at gmail.com> wrote:

> It may need a resistor to ground something that draws 5-10ma. Some GPS rcvrs
> need the dc load to believe a antenna is attached.
> 
> On Fri, May 20, 2011 at 7:21 AM, Robert Watzlavick <rocket at watzlavick.com>wrote:
> 
>> 
>> 
>> On 05/19/2011 10:35 PM, WB6BNQ wrote:
>> 
>>> Robert,
>>> 
>>> Two questions.
>>> 
>>> First, what is the voltage at the 9390 antenna connector with nothing
>>> attached
>>> besides your DVM ?
>>> 
>>> It shows 5V open circuit.
>> 
>> 
>> Second, what happens if you just attach the antenna straight to the 9390 ?
>>> By
>>> this i mean if voltage is on the antenna connector and while you are
>>> observing it
>>> and then attach the antenna what happens ?
>>> 
>>> I found something interesting here - with it connected straight to the
>> antenna, I measured 4.6V.  I connected and disconnected it several times and
>> didn't see any drops.  But, after the 5th connection or so, I finally got
>> the 9390 to show the same behavior as with the splitter and shut off its
>> antenna supply.  So it seems it's not exclusive to the splitter but just
>> that it occurs more often.  The antenna is connected directly to the little
>> GPS daughterboard module and I don't have schematics for it.
>> 
>> This isn't a showstopper, just interesting behavior.  One of the things I
>> like about the 58536A is that it will continue to power the antenna if you
>> remove other receivers from the ports (for troubleshooting etc.)  I guess
>> with this particular receiver, it is a little more sensitive to antenna
>> disconnects while it is powered on.
>> 
>> I suspect there is some protection process with the 9390 and the load or
>>> reverse
>>> voltage present from the splitter is causing it to activate.  However, I
>>> am not
>>> familiar with that unit.  Just asking general troubleshooting questions.
>>> 
>>> Bill....WB6BNQ
>>> 
>>> Agree - thanks.
>> 
>> 
>> -Bob
>> 
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