I test GPS antennae for warranty purposes: customers want to know if really defective or not.
On Fri, Oct 12, 2012 at 7:45 AM, <[email protected]> wrote: > Paul, > > > Azelio, > > Not at all the satellite splitters can be smart or passive. I use a > > passive > > so it has 1 dc path. But all of the other ports have dc blocks built in. > > The smarter units will direct the highest DC to the antenna. Its really > > diodes and I stay clear of those. To smart for there own good. > > The S14WI chose the lowest port with a DC present. (smarter than diods... > ;-)) > > > Plus with 3.3v and 5 v... it gets messy. I actually use the whole thing > as > > a passive. Have a line amp ahead of the splitter to make up for splitter > > loss. Feed it with its own supply that also feeds the antenna. > > > On some gps units you do have to add a dc load to trick them into > > believing > > an antenna is connected. > > This is included in (all) decent splitters. The load is usually 200ohms. > The S14WI will actually remove the load towards the receivers when it > detects a short/open condition towards the antenna. > > > Regards > > Paul > > WB8TSL > > > > On Thu, Oct 11, 2012 at 7:15 PM, Azelio Boriani > > <[email protected]>wrote: > > > >> To test this kind of items, you have to play with DC-blocks and > >> bias-tees. > >> Rather tedious but necessary. I know as at times I have to test > >> questionable GPS antennae that return after lightning strikes. > >> > >> On Fri, Oct 12, 2012 at 1:09 AM, paul swed <[email protected]> wrote: > >> > >> > Magnus what would the possibility be of measuring an 8 way satellite > >> > splitter? The $7 wonders with dc pass through. That looks like a very > >> nice > >> > network analyzer you have. > >> > Regards > >> > Paul > >> > WB8TSL > >> > > >> > On Thu, Oct 11, 2012 at 7:05 PM, Magnus Danielson < > >> > [email protected]> wrote: > >> > > >> > > On 10/12/2012 12:16 AM, Azelio Boriani wrote: > >> > > > >> > >> Please take care that the S14WI is "smart": if it doesn't sense a > >> DC > >> > >> current on the antenna port then it reports that to the user ports > >> and I > >> > >> think it can even power off the internal amplifier, this can > >> account > >> for > >> > >> the observed loss instead of the gain. > >> > >> > >> > > > >> > > I did consider this. but did not have the time and energy to follow > >> that > >> > > up at the time. It was only when I got home that I could dig up the > >> > > datasheet and manual of the S14WI. Didn't want to fry it in the lab. > >> > > > >> > > I rather do an incomplete lab quick and safe. I reports warts and > >> all. > >> > > > >> > > I'll see if I get time to re-do it tomorrow. > >> > > > >> > > Regardless, I want to get things going. More people than me should > >> be > >> > able > >> > > to do this. > >> > > > >> > > > >> > > Cheers, > >> > > Magnus > >> > > > >> > > ______________________________**_________________ > >> > > time-nuts mailing list -- [email protected] > >> > > To unsubscribe, go to https://www.febo.com/cgi-bin/** > >> > > mailman/listinfo/time-nuts< > >> > 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. > >> > > _______________________________________________ > > 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.
