Re: lowest power of the signal that LFRX can receive

GNU Radio
1

On 03/15/11, Alexandru C. [email protected] wrote:

The LFRX has almost no gain, so you’re limited by the noise floor of the
long, I get very good reception of AM broadcasting and ham radio
traffic around 7 MHz. I was using USRP1.

Alex

Really appreciate your reply. The signal that is trying to be detected
is -117dBm, which turns out a larger amplifier is need in my case.

I have another question really need your help: how to corresponds the
amplitude set by program to the Vp-p of the front end output of LFTX?
Also the same question with receiver side, how to corresponds the
amplitude to the received signal Vp-p. The amplitude at transmitter side
is set by the program and at receiver side the amplitude is the one of
the signal after DDC.

Really appreciate your help

Yan

2

On 16/03/2011 1:37 AM, Yan N. wrote:

The LFRX has almost no gain, so you’re limited by the noise floor of the
traffic around 7 MHz. I was using USRP1.

Alex
Really appreciate your reply. The signal that is trying to be detected is
-117dBm, which turns out a larger amplifier is need in my case.

I have another question really need your help: how to corresponds the amplitude
set by program to the Vp-p of the front end output of LFTX? Also the same question
with receiver side, how to corresponds the amplitude to the received signal Vp-p.
The amplitude at transmitter side is set by the program and at receiver side the
amplitude is the one of the signal after DDC.

Really appreciate your help

Yan

The only way to do this is to measure and calibrate. The
USRP+Daughtercard family aren’t precision measurement instruments.
There’s significant variability in the analog components. So, the only
way to do is to use already-calibrated measurement tools, and construct
your own calibration tables.