[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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