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.
