Re: [IRCA] SRF-59 Alignment Procedure / TRF?
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 <[EMAIL PROTECTED]> 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 > (40 air mis S of Pittsburgh - 20 air mis N of Morgantown, WV) > Home 724-627-8844 - Work 304-599-7830 x 1120 > [EMAIL PROTECTED] > > > > > ___ > IRCA mailing list > IRCA@hard-core-dx.com > http://montreal.kotalampi.com/mailman/listinfo/irca > > Opinions expressed in messages on this mailing list are those of the original > contributors and do not necessarily reflect the opinion of the IRCA, its > editors, publishing staff, or officers > > For more information: http://www.ircaonline.org > > To Post a message: irca@hard-core-dx.com > > -- Mesa Mike LA de NM ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
Re: [IRCA] SRF-59 Alignment Procedure / TRF?
An interesting idea, Fred. A Google search found a presentation from a couple years ago by a Columbia University researcher on VLSI -- Very Large Scale Integration, i.e. big IC's -- implementation of TRF. It was just a lecture presentation "foils" set, so there is no way to know what the suggested capabilities of the technology might provide. Something else for those interested to investigate. Despite this obvious Sony marketing ploy -- planting glowing performance reports on gullable DXer message forums -- I ordered my pair of SRF-59's a couple days ago. If the audio phasing scheme works as described, I'll finally be able to eliminate the IBOC hiss of 560 WQAM Miami, so I can hear my favorite station on 570, Radio Reloj, Santa Clara, CU. ;-) Curt --- W. Curt Deegan Boca Raton, (southeast) Florida, USA At 10:52 PM 12/23/2007, you 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 >(40 air mis S of Pittsburgh - 20 air mis N of Morgantown, WV) >Home 724-627-8844 - Work 304-599-7830 x 1120 >[EMAIL PROTECTED] ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
Re: [IRCA] SRF-59 Alignment Procedure / TRF?
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 (40 air mis S of Pittsburgh - 20 air mis N of Morgantown, WV) Home 724-627-8844 - Work 304-599-7830 x 1120 [EMAIL PROTECTED] ___ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
