Re: [Discuss-gnuradio] My SRP - Problem deciding on the RF Front End design.. need help.

[Eric Blossom]

On Tue, Aug 21, 2007 at 09:58:00PM +0530, Prasanna Rao wrote:
> Hello everyone,
> 
> I am planning to implement a small software-defined radio with a bandwidth
> of say 50-300 MHz at first. The system should be able to receive AM, FM, PM
> signals over the mentioned RF spectrum with upto 10MHZ baseband information.
> This would require an IF of at least around 11-12MHz. Can u ppl help me in
> choosing an appropriate RF front-end design for the hardware system?
> 
> I am facing a problem in selecting the right analog down-conversion system
> design which would possess a good IMRR, sufficient linearity and an
> acceptable SNR over the desired bandwidth. If I am to tune my radio through
> the software, which I want to, I'll have to set dynamic filter
> characteristics to the RF amplifier stage(before mixing) to facilitate image
> rejection. Can a superheterodyne down-conversion serve my requirement?? If
> not, what kind of receiver system should I use..? Is Direct-Conversion
> technique implementable in my case? Please share your knowledge on these
> matters.
> 
> I basically want a 10MHz IF for being able to receive Cable TV signals as
> well. Of course this will be quiet complicated but I will try to doing it.
> With that I may try touching ISM bands later at some pt when I have the
> required receive-boards..
> 
> Waiting for your response.
> 
> __________
> Regards,
> Prasanna


The quick path is to buy a USRP with a TV RX daughterboard.  Then you
can get to work on your software ;)

USRPs are available here: 

  http://ettus.com
  http://www.ettus.com/custom.html

Eric