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by ai5eedave
Tue Apr 24, 2012 10:20 pm
Forum: Other projects
Topic: Software Defined Radio
Replies: 61
Views: 31267

Re: Software Defined Radio

<t>Yep, I am insanely jealous that you already have your Pi... I was up a 1:00am local time on launch day trying to "register my interest", but I didn't get an official confirmation page from Element 14 until about 3:00am after many, many tries. That probably puts me at about 100,000th in line. The ...
by ai5eedave
Wed Dec 21, 2011 10:37 pm
Forum: Other projects
Topic: Software Defined Radio
Replies: 61
Views: 31267

Re: Software Defined Radio

<r>Again, I am really shooting for the $50 price point. A $25 RPi SDR front end goes a long way towards that goal, so I would very much like to design and build the RF and sampling board for around $25. Most of the alternatives suggested so far are closer to the $200 price point.<br/> <br/> So, here...
by ai5eedave
Wed Dec 14, 2011 9:45 pm
Forum: Other projects
Topic: Software Defined Radio
Replies: 61
Views: 31267

Re: Software Defined Radio

<t>I built one of Rick Campbell’s R2s back in the late 90’s when I was in college. With the lab equipment I was able to apply the quadrature local oscillator (LO) signals and inject a test radio frequency (RF) signal, and I heard the single side band (SSB) output just fine. I never built a stand-alo...
by ai5eedave
Mon Dec 12, 2011 11:21 pm
Forum: Other projects
Topic: Software Defined Radio
Replies: 61
Views: 31267

Re: Software Defined Radio

<r>OK. I see your point. I also now understand the difficulties of an up-converter to FunCube architecture. I was planning on designing (or “borrowing” the design for) a commutation type sampling system. The front end would be a 1:4 (SP4T) analog switch driven by a clock running at 4 times the frequ...
by ai5eedave
Mon Dec 12, 2011 6:36 pm
Forum: Other projects
Topic: Software Defined Radio
Replies: 61
Views: 31267

Re: Software Defined Radio

<t>It seems to me that this is again a matter of philosophy. Do I (or does the average person) want a top of the line receiver with all the bells and whistles, or do I want a basic, inexpensive system that gets me into the SDR game? When I thought of this, I was (and still am) inclined to the entry ...
by ai5eedave
Thu Nov 24, 2011 5:10 am
Forum: Other projects
Topic: Software Defined Radio
Replies: 61
Views: 31267

Re: Software Defined Radio

<t>Quote from dattaway on November 23, 2011, 08:10<br/> I will have fun with the funcube dongle sdr with the raspberry.<br/> <br/> WOW the funcube dongle looks nifty. The main problems I have with it is that it only goes down to 64 MHz, and that it costs 113 pounds ($175). I am interested in receivi...
by ai5eedave
Thu Nov 24, 2011 4:58 am
Forum: Other projects
Topic: Software Defined Radio
Replies: 61
Views: 31267

Re: Software Defined Radio

<t>Quote from radu on November 23, 2011, 05:53<br/> Isn't 100ish MHz a bit too much for such a limited CPU?<br/> <br/> The CPU wouldn't have to sample at 100 MHz. The 100 MHz signal would be down-converted to the audio range (0 - 10 kHz) which would be sampled at 40ish kHz. The CPU would be processi...
by ai5eedave
Wed Nov 23, 2011 5:42 am
Forum: Other projects
Topic: Software Defined Radio
Replies: 61
Views: 31267

Re: Software Defined Radio

<r>As a ham radio operator, electrical engineer, and part time amateur radio designer hack, I have been kicking around the idea of a small low frequency (30 kHz to 100ish MHz) sampling device for the front end of a software defined radio (SDR). I envision the front end being similar to the system de...

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