I'm running an N210 + LF TX/RX to 25W on HF, but also using separate RX and TX antennas with adequate isolation ( https://www.qrz.com/db/KD4HSO ). The LF-TX is direct sampling so you don't have the issue of LO leakage when you are not transmitting (i.e. zeros into sink). With the I/Q conversion devices you have LO leakage, and you must shut down the flow graph to kill it. If you offset-tune with an adequate filter then you could suppress the leakage enough. I have heard of using the LED on the N210 to trigger a relay, but still would require stopping the flow. Best method would be to use user I/O to control it (assuming you have that on your hardware) via messaging, but I have not gotten around to trying that.
Lou Daniel Pocock wrote > Based on the USRP specs (up to 100mW output power), I started looking > around for amps that would get me up to a level comparable with other > amateur rigs. This is one of the first I found: > > http://shop.kuhne-electronic.de/kuhne/en/shop/amateur/leistungsverstaerker/MKU+PA+2M-120W+HY+VHF+MOSFET-Power+Amplifier/?card=632 > > Specs mention a low-pass filter so harmonics shouldn't be amplified. > > It takes 100mW in and puts out 120W on 2 meters. It needs up to 21A > when running, that probably means getting quite a serious DC power > supply or just running it off a car battery. It looks like it needs an > external heatsink. > > Has anybody else tried solutions like this with USRP or other SDR > transmitters? > > For simplex operation, if the application is not transmitting, will > output power completely drop to zero when using something like this? > > Can anybody comment on how to wire the USRP and a power amp for TX and > RX through a single antenna? > > Regards, > > Daniel > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@ > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio -- View this message in context: http://gnuradio.4.n7.nabble.com/power-amplifiers-on-TX-tp57575p57736.html Sent from the GnuRadio mailing list archive at Nabble.com. _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
