I tried both: 1. bringing 5V to the coax connector requires a very long wire from the USB connector going all the way along the RF components of the DVB-T dongle: I found this wire to act as an antenna and significantly degrade the performance of my dongle 2. I made a small PCB including a 10 nF capacitor (0.02 ohm impedance at 1.575 GHz) and a 1 uH (50 kohms impendance at 1.575 GHz) going to the +5V pin of a USB-B connector. Seems to work properly, though I am still truggling to make sure I am indeed getting a GPS signal. The components were picked from some leftovers so the actual values you select my differ.
JM > I would like to connect an active GPS antenna (5v) to rtl-sdr. Here is I > thought: > > 1. Modify board let power go through the board MCX > 2. Buy a bias T. But I want power the bias T with my laptop, is there any USB > power bias T type of device in tHe market? > > Other solutions? > > Thanks > Dan > > Sent from my iPad -- JM Friedt, FEMTO-ST Time & Frequency/SENSeOR, 32 av. observatoire, 25044 Besancon, France
