[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Discuss-gnuradio] Question regarding the DBSRX frequency range and

From: Matt Ettus
Subject: Re: [Discuss-gnuradio] Question regarding the DBSRX frequency range and bandwidth
Date: Wed, 27 Jun 2007 18:53:03 -0700
User-agent: Thunderbird (X11/20070326)

Eric A. Cottrell wrote:
> Matt Ettus wrote:
>> Bandwidth:
>>     When Maxim states that their maximum LPF bandwidth is 33 MHz, they
>> mean one-sided bandwidth (i.e. 0 to 33 MHz).  Since it is used in a
>> direct conversion IQ system, that actually gives a 66 MHz bandwidth (-33
>> MHz to +33 MHz).  Since that is beyond nyquist for our ADC, I spec to 60
>> MHz (+/- 30 MHz).
>>     On the low end, they specify 4 MHz, which is really 8 MHz (+/-4 MHz)
>> of RF bandwidth.  The filter is actually capable of going to a much
>> narrow frequency, but it is outside of Maxim's specs, since nobody in
>> the small satellite dish market cares about less than 8 MHz of BW.  So I
>> spec that it goes down to 1 MHz wide.  It should be noted that when you
>> go below 4 MHz wide (2 MHz in Maxim-speak) that your noise floor will
>> rise a bit and phase noise may also rise.
>> Matt
> Hello,
> I assume the parameter for the setbw function is the double-sided
> bandwidth and not Maxim-speak?

Actually, it is in Maxim-speak...  Should probably be changed.


reply via email to

[Prev in Thread] Current Thread [Next in Thread]