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    <div class="moz-cite-prefix">On 07/07/2015 02:33 AM, Jeon via
      USRP-users wrote:<br>
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                  <div>First, I'd like to transmit bipolar signal
                    through LFTX on USRP N210.<br>
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                  An additional analog circuit will be connected to the
                  output port.<br>
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                Is it possible for me to guess how large peak-to-peak
                voltage will be driven from LFTX?<br>
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              <div>I've found that some says, '7 dBm'<br>
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              <div>That means, does the voltage depend on bandwidth and
                impedance of analog circuit and so on?<br>
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    You might find this chart helpful:<br>
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    <a class="moz-txt-link-freetext" href="http://ifmaxp1.ifm.uni-hamburg.de/DBM.shtml">http://ifmaxp1.ifm.uni-hamburg.de/DBM.shtml</a><br>
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    Indeed, that +7dBm rating is at the notional circuit impedance of
    50ohms.<br>
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              And for the second, at the receiver side, I have two
              options.<br>
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            <div>1. To feed a unipolar signal directly into LFRX on USRP
              N210.<br>
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            <div>2. To convert a unipoalr signal into a bipolar signal
              using op-amp and feed it into LFRX.<br>
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            What value of peak-to-peak voltage is safe to the LFRX in
            order not to burn the daughterboards? <br>
            I need to determine the output range of analog circuit if I
            choose (1) and I need to determine the value of op-amp gain
            if I choose (2).<br>
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    +10dBm should be safe, but for signal-quality purposes, back that
    off by about 3dB to +7dBm.<br>
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    In a 50-ohm system, that's about 1.4V P-P<br>
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          Regards,<br>
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        Jeon.<br>
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