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

J. Forster jfor at quikus.com
Thu Feb 20 17:43:40 EST 2014


The large amplitude swings happen on a very short time scale too.
Certainly <1 second at times.

-John

============


> Totally agree with you John as I learned. I knew it was a variable but I
> have seen nights that were crazy and do fit your 40 db. I redesigned the
> AGC to account for that in the fr front end actually.
> Regards
> Paul
>
>
> On Thu, Feb 20, 2014 at 4:34 PM, J. Forster <jfor at quikus.com> wrote:
>
>> At least on the Atlantic coast, the WWVB signal levels jump all over the
>> place, certainly 40 dB and maybe more.  If a receiver cannot deal w/
>> that
>> w/o losing lock, it's nearly useless.
>>
>> OTOH, LORAN was always a whopping signal.
>>
>> -John
>>
>> ================
>>
>>
>>
>> > Chuck thats easy. Because I could make it work. :-)
>> > That said there was a post on time-nuts about LORAN C receiver in
>> > software.
>> > I responded and have had the great pleasure of communicating with
>> Matthias
>> > over the last two weeks. I have learned a lot already and he in return
>> has
>> > a tested LORAN C receiver.
>> > So with some luck just maybe I can become smart enough to do a better
>> > design in software on a $15 micro. You still need the RF frontend
>> section
>> > that I released quite a while ago to time-nuts.
>> > Regards
>> > Paul
>> > WB8TSL
>> >
>> >
>> >
>> > On Thu, Feb 20, 2014 at 4:02 PM, Chuck Harris <cfharris at erols.com>
>> wrote:
>> >
>> >> At 60KHz, it shouldn't be out of range of most
>> >> general purpose CPU's, and even the most pathetic DSP.
>> >>
>> >> Why bother with a hardware solution when software can
>> >> do it more easily?
>> >>
>> >> -Chuck Harris
>> >>
>> >>
>> >> Florian Teply wrote:
>> >>
>> >>> Well, if someone comes up with a circuit, I could check how much
>> chip
>> >>> area that would consume in a 250nm SiGe BiCMOS... Shouldn't be out
>> of
>> >>> range for a serious time nut ;-)
>> >>>
>> >>> Florian
>> >>> _______________________________________________
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>>
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