I use two USRP N210 (daughter boards are XCVR2450 supports freq range in 2.4GHz - 2.5GHz) to experiment with tunnel.py in gr-digital/example/narrowband. I followed the instructions of README and varied the parameters. When I set freq in 2.4GHz to 2.5GHz: *./tunnel.py -f 2.42G -c 50* It didn't work, both the transmitter and the receiver only showed TX without RX and it didn't response when I ping.
But when I set the freq to 300M (which is not supported by daughter boards) *./tunnel.py -f 300M -c 50* It worked and both the transmitter and receiver showed TX and RX and response when I ping. And it also gave the following warning: *UHD Warning:* * The hardware does not support the requested RX frequency:* * Target frequency: 300.0000000 MHz* * Actual frequency: 2400.0000000 MHz* *UHD Warning:* * The hardware does not support the requested TX frequency:* * Target frequency: 300.0000000 MHz* * Actual frequency: 4500.0000000 MHz* Clearly the 4500MHz is not the real TX frequency. What is that? -- Regards, Weixian Zhou
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