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From: | Marcus D. Leech |
Subject: | Re: [Discuss-gnuradio] [USRP-users] B200 gain control and RF input power |
Date: | Sat, 18 Jan 2014 00:57:09 -0500 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.0 |
On 01/18/2014 12:31 AM, Luke Hough
wrote:
I don't think the switch can be made in under 1us from the host. With suitable mucking-about on the FPGA you might be able to come up with a suitable scheme that amounts to half-duplex switching. In the ordinary scheme of things the ATR state machine will switch the RX chain to the RX2 port during transmit. If this could be done fast enough, that would work fine, and you'd just put a terminator on the RX2 port in half-duplex mode. You could consider a scheme where some external machinery is helping with switching and "scheduling" things. Such machinery would perhaps arrange for a high-isolation path for RX during your TX cycle. This kind of problem is pretty standard in radar designs, so there are probably good solutions out there that could be hybridized to interface to an SDR approach. But radar isn't my particular expertise.
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