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Re: [Discuss-gnuradio] Components of BasicTX

From: Matt Ettus
Subject: Re: [Discuss-gnuradio] Components of BasicTX
Date: Mon, 21 Dec 2009 10:06:41 -0800
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20091209 Fedora/3.0-4.fc12 Thunderbird/3.0

On 12/21/2009 05:08 AM, Mathias Coinchon wrote:

I am using BasicTX daughterboard to generate a VHF signal around 228MHz.
For this a complex signal is generated at -28MHz  leading normally to harmonic 
components at
256-28MHz=228MHz (wanted signal)

However looking at the spectrum (see attached), I still see powerful components 

Is it normal or is is a missconfiguration from my side or an I/Q gain inbalance 
Is there a way to avoid these 156 and 284MHz components ? (they are hard to 
filter compared to other one actually)

You are looking only at one of the outputs from the BasicTX, so it is a real signal, not complex. Thus you will see the +28 MHz components as well. If you were to use both outputs and put them into a quadrature mixer you would see that the other components cancel.


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