I was going to suggest a similar solution. I think the article suffers from what NASA calls an "imagination failure:. One does not need to count anything. Using a micro processor (uP) and a Direct Digital Synthesizer (DDS) and a mixer it is very easy to create SDR type radio's these days. Perhaps the Arduino is not the most powerful uP available but it is simple to program and has plenty of IO pins to drive displays, DDS chips etc. It cannot do DSP however.
Perhaps the STM32F104 series of uP's would work better. Running at 120MHz or better they have DSP abilities as well as better facilities than offered by an Arduino such as ethernet, I2C, SDI, analog sensors etc. They are the same price too. They are also able to do DDS generation up to a few MHz which would further cut down on the parts count. However, "computers" used in the AM bands have an inherent problem with self generated noise. They clock speeds of these uP chips is so low that they put birdies and worse into the very bands they want to receive. We see this with the current crop of AM IBOC receivers. Forget what "they" tell you about digital being able to overcome interference issues; RF is RF. If you block it you will not be able to hear it. A S9+40db birdie or computer hash will not allow any desired signal to enter the circuit. Mark On Thu, Jan 22, 2015 at 8:55 AM, Greg Majewsk <[email protected]> wrote: > Funny, you mention this topic. If all does well, I will be bringing a small > single chip fm radio with Aduino board that can be controlled via a web > browser. I am looking at a radio design for ETOW. Several years ago, I > wrote up a specification for a ETOW radio for Tom. At this time, there were > no responses from ETON on it. I have started the process to come up with a > prototype that he could use to get some manufacturer's interest. I found a > good chip that has medium wave, shortwave and fm bands. Please do not tell > him, this is a surprise for him. I was going to show it at the fest. > > We can talk about this at the fest. > > I have some original Commodore 64 documentation. Do you know if there is > any interest in this stuff? If there is, I will bring with me. > > -- Enjoy life, Greg > Live Well, Laugh Often, Love Much! > > On 01/21/2015 09:10 PM, Ed Cummings wrote: >> >> Today I received this interesting applications note from Mouser >> Electronics which specifically mentions some technical challenges that >> designers of AM and shortwave radios face using DSP technologies. This >> paper might interest some SWLfest list subscribers. >> >> >> http://www.mouser.com/applications/next-gen-radio-ics-audio/?utm_medium=email&utm_source=january2015&utm_campaign=cm-audio-en&utm_content=article2rm >> >> Cheers, >> >> Ed Cummings >> >> _______________________________________________ >> Swlfest mailing list >> [email protected] >> http://montreal.kotalampi.com/mailman/listinfo/swlfest >> >> To unsubscribe: Send an E-mail to >> [email protected]?subject=unsubscribe, or visit the URL shown >> above. >> >> For more information on the Fest, visit: >> >> http://www.swlfest.com >> http://swlfest.blogspot.com >> > > _______________________________________________ > Swlfest mailing list > [email protected] > http://montreal.kotalampi.com/mailman/listinfo/swlfest > > To unsubscribe: Send an E-mail to > [email protected]?subject=unsubscribe, or visit the URL shown > above. > > For more information on the Fest, visit: > > http://www.swlfest.com > http://swlfest.blogspot.com _______________________________________________ Swlfest mailing list [email protected] http://montreal.kotalampi.com/mailman/listinfo/swlfest To unsubscribe: Send an E-mail to [email protected]?subject=unsubscribe, or visit the URL shown above. For more information on the Fest, visit: http://www.swlfest.com http://swlfest.blogspot.com
