I have seen a few messages asking about small, cheap antennas to use for portable SDRs, considering the RF bandwidths can span two decades. I found an SMA female, 12” telescoping whip and made a video showing how to remove the loading coil, along with the VSWR obtainable with an appropriate counterpoise (i.e. B200 or bladeRF sized PCB). The OEM antenna (Nagoya NA-773) is very inexpensive and easy to mod with basic dremel and soldering skills. VSWR of 3:1 is obtainable from 200 MHz through 6 GHz, with the exception of 1.8 - 2.2 GHz. I’ll probably do a follow-up experiment to see if tuning can be done by receiving via a small, non-resnoant loop on the adjacent RX port.
https://www.youtube.com/watch?v=EFlhSkqZ9dE Lou KD4HSO _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
