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

[paul swed]

As I mentioned earlier I would have guessed about 300 ohms at 5 V.
Good luck

On Fri, May 20, 2011 at 10:21 AM, Ed Palmer <ed_palmer at sasktel.net> wrote:

> I have a 58536A.  Although it isn't mentioned in the datasheet or manual,
> mine has a DC load on each input.  The load is four 1330 ohm surface mount
> resistors in parallel, e.g. 332 ohms or about 15 ma @ 5 volts.
>
> Ed
>
>
> Robert Watzlavick.com wrote:
>
>> 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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