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From: | Somya Ajmera |
Subject: | Re: [Discuss-gnuradio] USRP Basics questions |
Date: | Tue, 14 Apr 2009 23:38:40 -0700 (PDT) |
Hi Josh, on the SMA connectors I had connected my transmit receive antennas. I wanted to know if while transmitting and receiving signals using USRP sink and source blocks, can I silmatenously probe any pin on the transmit/receive daughter board inorder to see the signal out and in to USRP. Also I was trying to make an OFDM system by implementing the following blocks: Random Source:---->OFDM Modulator:------------>USRP Sink [Minimum=0; [ Modulation:8 QAM [Unit Number=0 Maximum=2; FFT Length=512 Interpolation=400 Num Samples=1M Occupied tones: 200 Frequency=100M Repeat=Yes] CP Length: 128 Gain=0 Pad for USRP=Yes Side=Side A] Payload length=0] After running this, when I probed pin tx0 - tx7 on the daughter board, I was able to see some waveforms on the scope. But when I build the receiver system: USRP Source:----------->OFDM DeModulator:------------>FFT Sink [Unit Number=0 [ Modulation:8 QAM Decimation=400 FFT Length=512 Frequency=100M Occupied tones: 200 Gain=0 CP Length: 128 Side=Side A RX Antenna=RXA ] I am get the following warning: "** (python:4085): WARNING **: IPP request failed with status 1030 Timeout " and now if i probe the same pins on the daughter board, I am not able to see any waveforms. Can you please help me to figure out this behaviour. Thanks & Rgards, Somya Ajmera --- On Tue, 14/4/09, Josh Blum <address@hidden> wrote: From: Josh Blum <address@hidden> |
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