Forum: GNU Radio GPS active antenna biasing

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8e2ce39154545934067abed84daeee82?d=identicon&s=25 Davide Anastasia (Guest)
on 2007-02-02 11:09
(Received via mailing list)
HI List,
I get a USRP + DSBRX. Now I need to buy an active antenna for GPS, but I
don't know how to bias it. Can anyone helps me?

Davide "Rocker" Anastasia

*    Linux User #341094    *

Luke Skywalker:
        Alright, I'll give it a try.
        No! Try not. Do... or do not. There is no try.
Davide Anastasia

F59554dad66070cab7da45ce0937c7c2?d=identicon&s=25 Gregory W Heckler (Guest)
on 2007-02-02 13:49
(Received via mailing list)
You can do this externally by putting in a bias-tee in the RF line prior
to input to the USRP. I've personally used the following from

Or if you want to take a more risky route, on the DBSRX daughterboard
there is header to input a DC voltage. I'm trying to do the same thing
(GPS with the DBSRX & USRP), and am not going to risk frying something
at this point. Hope this helps.
3596cfe1d579c65b9babd35e8787977c?d=identicon&s=25 Matt Ettus (Guest)
on 2007-02-02 19:57
(Received via mailing list)
Gregory W Heckler wrote:
There are 2 ways to use the built-in bias tee on the DBSRX --

1 - If you want to supply your own voltage, apply it to J100.  Put + and
GND on the marked pins

2 - If you want to use the onboard 5V regulated supply, DON'T connect to
J100.  Instead, place a short across the pins of J101.  The board is
unfortunately labeled "6V", but it is actually a regulated 5V.

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