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.
