---------- Forwarded message ---------- From: Prasanna Rao <[EMAIL PROTECTED]> Date: Aug 22, 2007 10:49 PM Subject: Re: [Discuss-gnuradio] My SRP - Problem deciding on the RF Front End design.. need help. To: Chris Albertson <[EMAIL PROTECTED]>
Hello Chris, Firstly I thank for your sincere advice.. Microtune devices seem to have a high IF at around 25+ MHz which far too much for my requirement. Do they provide lower-IF devices..? i gues they do, but cant find locate them on their site. As for the ADC output, I would be using a DDC to down-convert the samples to the baseband spectrum. By that way I can have just one common IF at say 10 MHz for various types of information channels including FM AM audio. But yes, the fast data stream required in processing TV signals may need a UDP-like mode of data transfer.. A small doubt I have here is, can I use the cable TV device to downconvert audio AM-FM channels? I guess we can.. kindly advice.. Regards, Prasanna On 8/22/07, Chris Albertson <[EMAIL PROTECTED]> wrote: > > > --- Prasanna Rao <[EMAIL PROTECTED]> 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? > > So you are not interested in HF bands or weak signals? and you > want to "see" a 10Mhz bandwidth signal. > I think these strong, broadcast makes your job a LOT easier. > I've read about > people using tuners designed for cable set top boxes. "Microtune" > makes a bunch of these that cover your range. I think you just hook up > one of these microtune devices to an ADC that samples at about 30M/Sec > and 10 to 12 bits per sample. At 30M/sec you don't need quadrature > clocks or QSD or anything like what SR40 does > > The big issue will be how to get that data stream into the computer. > If it were me I'd format the data is UDP packets and put it on a > Gigabit Ethernet cable. UDP is very easy being a one way stream > with no handshaking involved > > > > > Chris Albertson > Home: 310-376-1029 [EMAIL PROTECTED] > Office: 310-336-5189 [EMAIL PROTECTED] > KG6OMK > > > > ____________________________________________________________________________________ > > Building a website is a piece of cake. Yahoo! Small Business gives you all > the tools to get online. > http://smallbusiness.yahoo.com/webhosting >
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