Hi
Well, at least *some* of the chips out there do not make it to 96 KHz when sampling at 192 KHz. It’s been a few years since I dug into them. Back then a chip that had an internal filter that went to 96K was very much the exception rather than the rule. If the only point of 192K is getting to a 96K bandwidth, a lot of the chip guys missed out on it …. Bob > On Aug 6, 2015, at 6:24 AM, David G. McGaw <[email protected]> > wrote: > > That is not true. If the converter is set to 192kHz sampling, the bandwidth > will be nearly 96kHz, typically at least 80kHz, not limited to 20kHz. That > is the POINT of 192kHz sampling. > > David N1HAC > > > On 8/5/15 10:03 PM, Graham / KE9H wrote: >> Scott: >> >> You won't be able to use an off-the-shelf audio card, because they will have >> filters that cut off just above human hearing limits, somewhere in the >> mid 20 kHz range. I was referring to the data converter chips they use >> on those high end cards. The circuit for ~80 kHz (Nyquist) low pass >> filters >> and antenna interface would likely be a custom card. >> >> For the guys talking about the Tayloe receivers, the Tayloe front end is >> just >> a down converter to get the HF or VHF signals down into the range that WWVB >> is already in. So to receive WWVB, you only need the backend of the Tayloe >> receiver, ie., no Tayloe mixer required. Just the (audio) data converter >> and the >> DSP. >> >> --- Graham / KE9H >> >> == >> >> On Wed, Aug 5, 2015 at 5:47 PM, Scott Newell <[email protected]> >> wrote: >> >>> At 12:40 PM 8/5/2015, Graham / KE9H wrote: >>> >>>> Content-Transfer-Encoding: 8bit >>>> >>>> There are several high end audio Analog to Digital Data converters that >>>> will clock at 192 kHz, ~23 bits ENOB, which puts a 60 kHz signal sweetly >>>> in >>>> the first Nyquist zone. Typical NF of the front end of the data converter >>>> >>> Any specific recommendations? I've seen the Asus Xonar U7 (USB) and Asus >>> Xonar D1 (PCI) mentioned on some of the SDR sites. (I'm running XP and >>> linux.) >>> >>> >>> -- >>> newell >>> >>> >>> _______________________________________________ >>> time-nuts mailing list -- [email protected] >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >>> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
