Re: [Discuss-gnuradio] USRP2 FM TX and FM RX working together
From:
Jorge Miguel
Subject:
Re: [Discuss-gnuradio] USRP2 FM TX and FM RX working together
Date:
Thu, 23 Sep 2010 09:36:24 +0200
Nick,
Now all my sample rates match. But I cannot demodulate the signal. However, I tune my FM phone receiver and the transmitted signal is ok. I can listen to it perfectly.
This is the message code I get on GRC:
..................SSSaUSSSSSSSaUSSSSSSSaUSSSSSSSSaUSSSSSSSaUSSSSSSSS aUSSSSSSSaUSSSSSSSSaUSSSSSSSSaUSSSSSSSSaUSSSSSSSSSaUSSSSSSS SaUSSSSSSSSSSaUSSSSSSSSSaUSSSSSSSaUSSSS............
Furthermore I found out that my Ethernet interface is discarding a lot of received packages (the ones that carry de demodulated signal to my computer). See:
But my interface is in 1000Mbps mode and full duplex. Why do I have dis problem?
With my configuration I have 15,35Mbps to the USRP2 (Tx) and 3.2Mbps from the USRP2 (Rx). Is is by far less than the capacity of the Ethernet interface which is in this state:
~$ sudo ethtool eth0 Settings for eth0: Supported ports: [ TP ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full
Supports auto-negotiation: Yes Advertised link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Advertised pause frame use: No
Advertised auto-negotiation: Yes Link partner advertised link modes: Not reported Link partner advertised pause frame use: No Link partner advertised auto-negotiation: No Speed: 1000Mb/s
Duplex: Full Port: Twisted Pair PHYAD: 1 Transceiver: internal Auto-negotiation: on MDI-X: off Supports Wake-on: pumbag Wake-on: g Current message level: 0x00000001 (1)
Link detected: yes
Modulator chain by itself works fine and do the demudulator chain does. But together I have this problem of Bandwidth?