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From: | Marcus D. Leech |
Subject: | Re: [Discuss-gnuradio] UHD USRP2 full duplex mystery solved |
Date: | Mon, 14 Mar 2011 13:17:15 -0400 |
User-agent: | Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.15) Gecko/20110303 Thunderbird/3.1.9 |
On 14/03/2011 12:12 PM, Marc Epard wrote:
Although the XCVR2450 doesn't do full duplex, the WBX does, and current UHD avoids the problem I described in my previous message. However, the WBX has enough internal leakage between tx and rx that we gave up on single-daughterboard full duplex. We now use a USRP2 with a WBX for tx and a USRP N210 with a DBSRX2 for rx. As for examples, I'll try to clean up my C++ app and post it later this week. GRC works fine full-duplex, too, I believe. -Marc
Saw XCVR2450, and assumed you were using it.How much isolation does your application need? The HMC174-series switches in the WBX are roughly 26dB isolation each, and there should be two such paths between transmit and receive when using RX2 and TX/RX, giving roughly 52dB isolation (at least from the switches--circuit paths may make this number worse).
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