[time-nuts] New WWVB modulation format receivers (NOT)

wb6bnq wb6bnq at cox.net
Fri Feb 21 03:35:09 EST 2014



NOTE:  THE FIRST FIVE LINKS DID NOT SHOW AS COMPLETE ADDRESSES -- I AM 
NOT SURE WHY, SO YOU WILL HAVE TO COPY THE LINE AND INSERT INTO  YOUR 
URL LINE.

Hi Bob,

Here are a couple of HP Appnotes, in PDF form, that will get you started 
in your quest.  Some of the references to standard frequency 
transmissions may be somewhat outdated but the overall data is still 
valid.  The first one is the original publication done in the early 
1960's and the next two are a rewrite done in the 1970's.

http://www.ko4bb.com/Manuals/05)_GPS_Timing/HP/HP_AN52_Frequency_and_Time_Standards_5989-6171EN.pdf

http://www.ko4bb.com/Manuals/05)_GPS_Timing/HP/HP_AN52-1_Frequency_and_Time_Standards_5989-6183EN.pdf

http://www.ko4bb.com/Manuals/05)_GPS_Timing/HP/HP_AN52-2_Frequency_and_Time_Standards_5989-6247EN.pdf

http://www.ko4bb.com/Manuals/05)_GPS_Timing/The_Science_Of_Timekeeping.pdf

And finally, here is an appnote about counters, generally, that is worth 
reading

http://www.ko4bb.com/Manuals/HP_Agilent/HP_AN200_frequency_counters_1997.pdf

There are plenty of other publications, but no need to overload you too 
early in the game.  The stuff above will give you a basic understanding 
of the fundementals of which your questions to this list are centered omn.

73....Bill....WB6BNQ


Bob Albert wrote:

>My TS-940S acts as though it receives okay at 60 kHz.  Not great sensitivity but it does receive.
>
>
>Most HP GPS receivers are expensive ($400?).  I was hoping to get some results with what I have, although I'm willing to cobble up some circuitry.
>
>I assume if I can receive the signal, I can figure out how to decode it and/or use it as is.  How does one use a 1 pps signal to get precise frequency measurement?  Maybe use it as a time base for a counter?  My counter has 1 pps as well as 0.1 pps for 10-second count.  I would assume signal fading would cause some timing uncertainty due to finite rise and fall time.  And at 60 kHz I think rise and fall time would be long.
>
>I will look through the archives.
>
>Bob
>
>
>
>
>On Thursday, February 20, 2014 10:12 PM, Hal Murray <hmurray at megapathdsl.net> wrote:
> 
>
>jimlux at earthlink.net said:
>  
>
>>I sample at 100 kHz with 16 bits on a teensy3.. 
>>    
>>
>
>Neat.  Thanks.  How many effective bits?  (when the input signal is 60 KHz it 
>that matters)
>
>
>Can somebody give me a lesson in the tradeoffs between number of bits and 
>sampling rate?
>
>I know of one special case.  If your ADC is only 1 bit, you don't have to 
>worry about AGC.
>
>
>  
>




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