Magnus Danielson wrote: > jmfranke wrote: >> I used a bias tee with a capacitor block. I varied the resistor >> until I could see signals coming from the external antenna, the built >> in patch was shielded with aluminum foil and the receiver verified >> that no signals were coming from the internal antenna. Some >> receivers needed only a 10K resistor, some models needed 220 Ohms. > > In my case I still want it to pass 5 VDC, but let the receiver see > some additional current, so I put a coil in series with the resistor, > to not load the RF too much. > > Cheers, > Magnus You need to ensure that the coil/inductor doesn't have its first resonance below 1575.42MHz for an L1 receiver, otherwise it isn't very effective. There are some wideband chokes with first resonances well above 10GHz when mounted correctly.
Bruce _______________________________________________ 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.
