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

[Prasanna Rao]

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