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SONY NXP FM super tuner hot on EBAY


XDR  S3HD




De hele tuner bestaat uit een paar simpele filtertjes.
De 2 NXP ( PHILIPS)  chips bepalen de eigenschappen.

and inside you'll find the NXP TEF6730/SAF7730 radio chipset and several adjustments. The HD module contains an SAF3550 processor and a 16MB SDRAM.

een zeer goede review hier
http://ham-radio.com/k6sti/xdr-f1hd.htm


The XDR-F1HD uses advanced digital signal processing algorithms to dramatically improve reception of FM signals corrupted by noise and interference.
Threshold extension suppresses the impulse noise ordinary FM detectors generate for weak signals. The obtrusive character of this noise quickly degrades reception quality as the signal level falls below a threshold. The impulses arise from detection-vector phase reversal due to additive noise peaks. High-performance satellite and terrestrial microwave FM links have long used various threshold extension techniques to enhance performance. Tracking filter detectors that may extend the threshold occasionally have appeared in consumer FM broadcast tuners.
Adaptive noise reduction forms a filter that tracks the spectrum of the L−R stereo signal. The filter suppresses noise between and beyond spectral peaks without restricting program bandwidth. It also suppresses co-channel interference and multipath distortion, factors that can limit reception quality for stronger signals. The technique takes a big bite out of the 23-dB S/N penalty that has always bedeviled FM stereo reception. Remastered legacy recordings use adaptive noise reduction to suppress surface noise and tape hiss. This may be the technique's first appearance in consumer audio equipment.
Adaptive digital IF filters eliminate adjacent-channel interference in nearly all cases. The filters have flat passbands with extremely steep skirts. The DSP rapidly swaps filter coefficient sets while retaining state variables to dynamically adapt the filter bandwidth to modulation level and interference without introducing switching artifacts. The digital filters are much more effective than conventional analog IF filters. In addition, they do not have the unit-to-unit variation that necessitates ceramic filter selection or tuned compensation for optimal performance. Finally, the symmetrical finite impulse response provides constant group delay. This prevents the audio distortion that group-delay variation in analog filters causes.


Word beschouwd als de beste FM tuner ooit.  
Andere top tuners komen niet in de buurt van de waarden voor selectiviteit en gevoeligheid van ontvangst van zwakke FM Stereo signalen.
Puur door zeer goede software bewerking van de FM stereo signalen.  Niet eens een laag ruisgetal   ca 7dB 

Helaas niet meer in productie.
Op Ebay is het een hot item de prijzen zijn  veel hoger dan de oorspronkelijke 99$
Ik kwam daar pas een beetje achter toen Gerard PE1BBI  zijn FM DX radio mee had in het weekend van de ARRL10

Zelf heb ik een SANSUI  TU717  ik dacht altijd  dat dat een hele goede was.
Maar eigenlijk wordt het me nu pas!  duidelijk waarom de ontvangst van zelfs lokale zenders in goede stereo kwaliteit vaak al lastig en behelpen is. Slechte tuners het kan veel beter. 


NXP heeft wel opvolgers
http://www.nxp.com/documents/leaflet/75017318.pdf

De TEF664X    combineert  TEF6730 SAF7730  in 1 lijkt het
of die net zo goed is?  

Ik ken geen tuner met deze chips.




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