On 01/04/2013 08:24 PM, José María Valencia wrote:
Hi, I want to transmitand receivea1kHz cosinetoneusing dsb am
modulation and usrp1 with2wbx dbs,I have connectedfromtx/rx output
wbx-ato rx2 inputwbx-b with a 50ohmsma cable, I'mexpectingin scope
sinkthe cosine tone with 1KHz butI have another signal, can you tell
me what could be the error?
I'm based on the complex envelope theory: I=Ac(1+m(t)) Q=0
You can see the diagram and the signals onthe attached image.
Thanks.
<<...>>
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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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