Hi, I while ago we bought two USRP2. When they came we tested them with the usrp2_siggen and usrp2_fft programs. Also we had two USRP1 and used USRP_oscope to see the waveforms produced by USRP2. Everything seemed to work OK. Then we didn't do anything with the USRP2 for a while. I few days ago I tried using them again and discovered I couldn't transmit or receive anything. I saw in the mailing list that those who got an SD-Card labeled "9/22/08" must update their firmware so I updated the firmware using the images from the site. Now I can receive(?) but I can't transmit. I mean no signal is transmited from the USRP2'santenna because if it where I would see it in usrp_oscope. Samples however are send from the PC to USRP2 because the leds on the Ethernet port light when I run a program like usrp2_siggen or something of my own. Does anyone has any idea about what's wrong? How do I check if the transmit frequency has been set OK? In another message it was mentioned that there is no PGA on USRP2. Then what does set_gain() in a usrp2 sink or source?
I also noticed something about the received signal. First the noise variance seems to change when there is a signal and when there is not. Is this normal? Is there some AGC circuit that causes this? If so can I disable it from code. I haven't noticed anything similar in USRP1. Thank you Manolis
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