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Hi,
How much attenuation we need to safely connect two WARP v3 boards or one WARP in a self-loop using a coax cable? (attenuation necessary to not damage the boards). Thanks.
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It depends on your waveform and Tx power settings. We recommend a minimum of 30dB to avoid damage. 50+ dB is more realistic for modeling actual wirelss propagation (even 50dB emulates a high SNR reception; we use ~50dB attenuators when characterizing PHY performance at mid-to-high SNR).
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I just want to take a copy from the signal. Do you think 40 dB of attenuation is enough (I have only 40 dB fixed attenuator)?
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Yes, 40dB should be enough to avoid damage. Depending on the waveform you are sending, the reception will be very high power by normal over-the-air standards. For example, the 802.11 Reference Design defaults to a 15dBm transmission power, so the received signal will be approximately 15-40 = -25dBm.
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Thank you for your insights.
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