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. > _______________________________________________ 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.
