[time-nuts] wtd: WWVB info

[Graham / KE9H]

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 <newell+timenuts at n5tnl.com>
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
>
>
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