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Re: [Discuss-gnuradio] BasicRx Daugterboard Frequency Wrapping
From: |
isaacgerg |
Subject: |
Re: [Discuss-gnuradio] BasicRx Daugterboard Frequency Wrapping |
Date: |
Thu, 22 May 2008 08:29:49 -0700 (PDT) |
In the short term, how do i fix this problem? Do I just low pass filter my
incoming signal?
Isaac
Ed Criscuolo-2 wrote:
>
> isaacgerg wrote:
>> Hi,
>> I am hooked up to the BasicRx Daughterboard and wrote a simple
>> applicate
>> using the GRC to survey the spectrum from 1MHz to 250MHz and run the user
>> tunable output through the WFM Demodulator. I can get FM radio stations
>> in
>> the 88-108MHz region just find. However, I am also getting copies of
>> these
>> stations at frequencies higher and lower than this range!!! It's as if
>> the
>> frequency I request is out of range and the tuner wraps around. What's
>> going on here? When I tune to 50MHz, I expect to be at 50MHz, not some
>> other frequency!
>
> On re-reading my first post, I realized it wasn't very clear. So,
> to be more explicit:
>
> A 0 - 32 MHz signal will produce the expected output.
>
> Signals from 32 - 64 MHz will get mapped onto 32 - 0 MHz
> (note the frequency inversion)
>
> 64 - 96 MHz will get mapped to 0 - 32 MHz
>
> 96 - 128 MHz will get mapped to 32 - 0 MHz
>
>
> ... and so on, up to the limits of the board.
>
>
> @(^.^)@ Ed
>
>
>
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>
>
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