Re: [IRCA] SRF-59 Alignment Procedure / TRF?

["Mike Westfall, Lost Almost NM" <mwdx@xxxxxxxxxx>]

Interesting idea, but...

Don't the SRF-59 and the SRF-M37V use the same IC (CXD1129AN)?
The M37V is digitally tuned, and I can't imagine how you would
implement a TRF circuit easily on a digitally tuned radio....

The SRF-59 does probably enjoy a tuned front end though, like most
analog tuned radios, which is probably the secret to its better
selectivity.



On Dec 23, 2007 8:52 PM, Fred Schroyer <freditor@xxxxxxxxxx> wrote:
> Let me toss out a really dumb question: since no one seems to be able to
> determine the IF of the SRF-59, could it be that it has no IF? Could Sony's
> sophisticated radio chip be a TRF? Which would help to account for its
> astonishing performance?
>
> As Wikipedia notes, "[A TRF receiver is] A radio receiver, usually comprised
> of several tuned radio-frequency amplifiers followed by circuits to detect
> and amplify the audio signal. Prevalent in the early 20-th century, it can
> be difficult to operate because each stage must be individually tuned to the
> station's frequency." With contemporary cicuitry, wouldn't a
> high-performance "TRF-on-a-chip" be feasible?
>
> Fred Schroyer
> Freelance Science Writer / Editorial Consultant
> 955 Sixth Street - Waynesburg, PA 15370
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-- 
Mesa Mike
LA de NM
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