Hi
The front end would be “dealers choice”. He who does the
project gets to decide what gets used.
If you look over some other designs, you can indeed get
a device going with a 12 bit converter. The qualifier is that
the signal to noise needs to be pretty good. With fades
and switcher
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
is 20 to 25 dB, so noise floor well below the atmospheric noise level at 60
Interesting, mine does not have a HP tag, just a dot-matrix printed label
with one line. Hopefully by next spring I'll be set up to where I can do
some 'real' checking of the the oscillators I have.
Thank you for the enlightenment
-pete
On Wed, Aug 5, 2015 at 8:13 AM, Charles Steinmetz
Does anyone have a schematic for building a simple WWVB receiver ?
Any information would be grateful.
- Don
See http://www.joejaworski.com/wwvb/ for a recent WWVB project.
See http://www.tinaja.com/glib/WWVBexps.pdf for a vintage project.
/tvb
There is someone on ebay selling an analog 'movement'
http://www.ebay.com/itm/181283274562
DISCLAIMER: Not associated with the seller
On Wed, Aug 5, 2015 at 4:15 AM, Bob Camp kb...@n1k.org wrote:
Hi
The front end would be “dealers choice”. He who does the
project gets to decide what
On 8/4/2015 9:36 PM, Hal Murray wrote:
kb...@n1k.org said:
So far there have not been any home brew design radios show up that will
demodulate and lock to the new data format. There is plenty of info on the
transmit format. The demodulation approach is not crazy hard. That said,
there’s still
Hi
10 MHz does not divide by an integer to 60 KHz. 15 MHz, 6 and 9 MHz are all more
reasonable candidates. The attractiveness of 15 MHz and the value of a tunable
OCXO is what makes the current $25 price of the KS boxes pretty attractive. You
*might* even be able to dispense with the tear down
Hi
It will work as a direct conversion radio. As with any of these, the practical
result
will be a tone at a lower frequency. You will convert 60 KHz to 600 Hz by using
a 60.6 KHz
local oscillator. The big question is: Does this really help out or not?
Bob
On Aug 5, 2015, at 3:41 PM, Donald
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
On 8/5/15 12:41 PM, Donald wrote:
On 8/4/2015 9:36 PM, Hal Murray wrote:
kb...@n1k.org said:
So far there have not been any home brew design radios show up that will
demodulate and lock to the new data format. There is plenty of info
on the
transmit format. The demodulation approach is not
Hi
Analog Devices has some very nice ADC’s that are directly targeted at
doing this general sort of thing. They do not have any “odd” filtering approach
that creates issues. Some of the early 192 KHz audio parts did not do very well
past 1/4 the clock rate.
Bob
On Aug 5, 2015, at 6:47 PM,
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
Hi,
I got my new Thunderbolt up and running this past weekend but I have a few
questions. I understand Lady Heather is a better program, and I have downloaded
it. However right now I am trying to get things right with Tboltmon first. I
had used it with my previous GPSDO, a Starloc II. I hate
If one were trying to use it not simply for the time code but also as a
frequency reference, it seems to me that the ideal thing would be a ADC
that can easily use an external clock (derived from a local voltage-tuned
OCXO reference under control of the SDR). Otherwise one is doing (rather
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