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 <[email protected]> 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 <[email protected]> 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 < >>> [email protected]>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 >>>> >>>> >>> > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
