Re: [Discuss-gnuradio] [USRP-users] B200 gain control and RF input power

Luke, take a look at J400, 3 pin 0.1" header next to the FPGA….it's nominally for a debug UART for engineering work, currently unused in the production RTL. This would be an easier header to work with for a simple external T/R switch than the MICTOR debug header. Another alternative is the GPSDO

Re: [Discuss-gnuradio] [USRP-users] B200 gain control and RF input power

Luke, I have not used B2xx, but its TX/RX antenna port should be similar to USRP N2xx. In GR application if u stop feeding samples to USRP-sink and last sample has "End-of-burst" EOB tag, then the TX/RX antenna port, automitically switches from transmission path to reception path. This is done usi

Re: [Discuss-gnuradio] [USRP-users] B200 gain control and RF input power

With USB or serial control I guess you will never reach the necessary accuracy in switching time. I see the only possibility in some hard wired connection to the USRP. Ralph. From: USRP-users [mailto:usrp-users-boun...@lists.ettus.com] On Behalf Of Luke Hough Sent: Thursday, January 23,

Re: [Discuss-gnuradio] [USRP-users] B200 gain control and RF input power

Luke, I am also doing a similar project in which i plan to use TR switch instead of circulator because of high TX/RX isolation (60/70 dB) as compared to isolators (20/30 dB). Currently u are using power amplifier ZVE-8G which have output power ~=30 dBm so circulator will work as well but if u pla

Re: [Discuss-gnuradio] [USRP-users] B200 gain control and RF input power

On 01/18/2014 12:31 AM, Luke Hough wrote: Get your tomatoes ready, I have attached a proposed block diagram and possible component specs. I have not actually purchased the limiter or the circulator, but I do have the power amp and antenna. The power amp is a ZVE-8G