Hi I have an Elonics 4000 USB receiver, and I-m trying to do some measurements on the digital television received power in my area. Everything works fine, except that the received power is never lower than -46 dB, even on channel which are not occupied. I was expecting to get values like -120 dB or something similar, instead in my measurements the lowest point in any portion of the spectrum is circa -46 dB. Am I missing something? Thank you Best
Hi, -48bB is the theoretical limit for a 8bit ADC. There are two channels and a bit of filtering but it will not help that much. Stefan Am 16.04.2013 07:35, schrieb Luca Bedogni:
Hi I have an Elonics 4000 USB receiver, and I-m trying to do some measurements on the digital television received power in my area. Everything works fine, except that the received power is never lower than -46 dB, even on channel which are not occupied. I was expecting to get values like -120 dB or something similar, instead in my measurements the lowest point in any portion of the spectrum is circa -46 dB.
Am I missing something?
Thank you Best
Thank you So, If I want to get the real power on the channel, what should I do? Basically when I get like -46/-47 dB I'm getting only noise, right? Thank you very much -- Luca Bedogni Academic: http://lbedogni.web.cs.unibo.it Photo: http://www.lucabedogni.it On Tue, Apr 16, 2013 at 12:20 PM, Stefan Sydow <st@metafly.info> wrote:
Hi,
-48bB is the theoretical limit for a 8bit ADC. There are two channels and a bit of filtering but it will not help that much.
Stefan
Am 16.04.2013 07:35, schrieb Luca Bedogni:
Hi I have an Elonics 4000 USB receiver, and I-m trying to do some measurements on the digital television received power in my area. Everything works fine, except that the received power is never lower than -46 dB, even on channel which are not occupied. I was expecting to get values like -120 dB or something similar, instead in my measurements the lowest point in any portion of the spectrum is circa -46 dB.
Am I missing something?
Thank you Best
I have an Elonics 4000 USB receiver, and I-m trying to do some measurements on the digital television received power in my area. Everything works fine, except that the received power is never lower than -46 dB, even on channel which are not occupied. I was expecting to get values like -120 dB or something similar, instead in my measurements the lowest point in any portion of the spectrum is circa -46 dB.
Am I missing something?
Yes ... those are not absolute dBm values ... There is no calibration whatsoever so the '0dB' level doesn't mean 0 dBm at all ... Cheers, Sylvain
participants (3)
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Luca Bedogni -
Stefan Sydow -
Sylvain Munaut