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RF detector for TV band

Hello,

I am searching fo RF detector for special application.

I need to check and measure the RF signal power from a broadband TV amplifier. The TV frequency band is UHF (470...790MHz). There are 40 UHF channels each 8MHz of bandwith and the modulation is COFDM.

The power of these channel is very different (from channel to channel) and the difference could be up to 15 or 20dB. Now, take into account this situation, I am here to ask to you if there is an RF detector that could help me to measure the RF power of this channels. Note that I don't measure one channel but all channel together (the entire band!).

Besides which kind of detector is more suitable for this application? Peak, Logaritmic or RMS? Based on high crest factor I think that the RMS is the right choose, can you confirm to me?

Due to first time that I use this RF detector I don't know if my application could be covered by these devices or not.

Thank you in advance for support.

Best Regards

Giuseppe

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  • I would recommend an RMS responding detector. Any of the Analog Devices rms responding detectors will cover this frequency and they will measure all of the RF power that they see in the band. If the total power range is only 15-20 dB, then a low range device such as ADL5903 will work fine. (www.analog.com/adl5903). If you need more range, you could use ADL5902 which has around 60 dB of detection range (www.analog.com/adl5902).

    You will also need a directional coupler (ADI does not make these) to couple off some of the signal power from the main transmitter path. Depending on the power level in the main signal path, some additional attenuation may be required after the directional coupler, before you apply the signal to the RF detector. The max input power to these detectors is usually in the 0 dBm to +10 dBm range.

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  • I would recommend an RMS responding detector. Any of the Analog Devices rms responding detectors will cover this frequency and they will measure all of the RF power that they see in the band. If the total power range is only 15-20 dB, then a low range device such as ADL5903 will work fine. (www.analog.com/adl5903). If you need more range, you could use ADL5902 which has around 60 dB of detection range (www.analog.com/adl5902).

    You will also need a directional coupler (ADI does not make these) to couple off some of the signal power from the main transmitter path. Depending on the power level in the main signal path, some additional attenuation may be required after the directional coupler, before you apply the signal to the RF detector. The max input power to these detectors is usually in the 0 dBm to +10 dBm range.

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