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From: | Marcus D. Leech |
Subject: | Re: [Discuss-gnuradio] sending single tone Am modulated using usrp1+wbx |
Date: | Fri, 04 Jan 2013 20:32:09 -0500 |
User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.24) Gecko/20111108 Fedora/3.1.16-1.fc14 Thunderbird/3.1.16 |
On 01/04/2013 08:24 PM, José María Valencia wrote:
So, did you use an attenuator, or did you connect directly? I suggest that you put in a 30dB attenuator in-line, and carefully adjust both the TX and RX gain until you see the spectral component you need. Connecting a transmitter directly to a receiver (whether it's a USRP or any other piece of radio equipment) is generally a bad idea -- there's a *strong* risk of damaging the front-end of the receiver. More so when the receiver (such as with WBX) has a low-noise front-end. So, when you're doing laboratory "loopback" tests, you use an attenuator. The WBX receiver is easily capable of "seeing" extremely weak narrowband signals, so there's no reason not to put in a fair amount of attenuation and experiment with gain levels on both the RX and TX side. -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org |
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