SDR -- a Simple and effective radio for anyone !!!

[sarma]

SDR article is welcome for simplicity point of view. Thanks EE for such NICE Project.

B.Kainka deserves all the appreciation for the amount of effort on his continuation of simple designs published earlier.

Perhaps we expect maximum number of boards to be assembled and the article effectively used around the world and especially the world of amatures (SWLs)

While the ciecuit is with minimal components, as a sigle component CY27EE16ZE appears VERY costly. Whether any alternative could be suggested please.

Again thanks to EE and B.Kainka

Regards
Sarma
mvs_sarma@yahoo.com

[burkhard kainka]

Hello Sarma,

thanks a lot!

A cheaper oscillator could be the ICS307-2
http://www.elexs.de/clock5.htm
Its produces a little more noise and tuning is a bit more difficult. But I tested it with the SDR. It seemed ok.
Much better - but also more expensive - is a combination of DDS and multiplier. AD9835 + ICS501 was tested here:
http://www.elexs.de/clock6.htm
http://www.elexs.de/iq5.htm

Peter Carnegie (G8JCF) uses this combination in his SDR software too: http://www.g8jcf.dyndns.org/

The CY27EE16 is right in the middle of performance and price.

Burkhard

[sarma]

Hi, Thanks to B. Kainka for his fast reply. i was able to get AD9951BRSZ for around $20/-. while my google search for Cy27EE16ZE indicated it at around $130/- perhpas i may have mis-interpretted? Can i know the approx price either $ or Pounds? Regards Sarma

[burkhard kainka]

Its available at 8.50 EUR here:
http://www.ak-modul-bus.de/stat/spezial_ics.html

It seems future sells them in large quantities too, 4,08 USD each, but you have to buy 740 pcs:
http://www.componentsuperstore.com

Burkhard

[sarma]

HI B.Kainka,

Thanks for the info. And the new board with small size RF chokes looks fine as I saw in ur site.
Nice of you sir.

Regards
Sarma

[burkhard kainka]

[ new topic started -- G8JCF software ]

[fredv]

Is this the correct part?

http://www.digikey.com/scripts/DkSearch/dksus.dll?Criteria?Ref=463723&Site=US&Cat=34669254

I noticed the reference to comparing it to an ICOM. What kind of antenna did you use in your test?

[gward@talk21.com]

I was interested to read the SDR radio article but was ulitmately frustrated by it.

I am not much of a radio expert, but have always been interested. So I wanted to get an understanding of exactly what the software signal processing was doing, and other ways of implementing it.

While I know the intention of article was not to give a detailed explanation of how it worked - it was in the "Hands on" section- the links did not add anything to my understanding.

Any chance of a follow up article or a post with links to more informative articles

G. Ward

[burkhard kainka]

Gerald Youngblood wrote a very detailed explanation here:

http://www.flex-radio.com/News.aspx?topic=publications

[sarma]

Hi B. Kainka and others,
recently i came across a case of failure of a radio Rx while interconnecting with a pc, when power failed
and restored-- even with UPS working.

most probably it is a dangerous situation. generally circuits are interconnected with -- bodyconnection established first. then only tip and ring of the jack. this is unfortunately impossible with PC audio kacks.
under such cases, perhaps the authors may help suggesting affordable protection devices so as not damage ones own life and the devices he/she is using. especially with LONG WIRE ant connected to SDR or DRM boards, lightening protection appears a must.

HAM radio guys know these tricks from experience. other enthusiasts may have to exercise caution-

regards
Sarma