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Re: [Discuss-gnuradio] TVRx and BasicRx gain questions

From: Sebastiaan Heunis
Subject: Re: [Discuss-gnuradio] TVRx and BasicRx gain questions
Date: Thu, 5 Mar 2009 21:41:33 +0200


Sorry to bother.  Please tell me why I lose 6dB when measuring the
signal at pins 17 and 18?  I have the RF transformer from Minicircuits
that is supposed to match the 200ohm output of the TVRX to a 50ohm so
that I can measure it on a spectrum analyser.  Because it is matched,
I should not have a 6dB loss?

I believe the input impedance of the ADC is around 220ohms?  How does
the BasicRx work?  The input is 50ohms, so is there an RF transformer
on the BasicRx that matches this to the ADC?

Thanks in advance.


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