[time-nuts] KD2BD WWVB receiver/decoder in QEX

[paul swed]

Charles great suggestion on the NE5532. Just bread boarded the first
section of the receiver very quickly and the component values work as is.
Thats also as it should be. I need to do a noise check tomorrow but it
appears I can heat up the ole soldering iron and build quite a bit of the
receiver.
Ah the smell of burning insulation and flux in the evening.
Regards
Paul WB8TSL

On Mon, Nov 23, 2015 at 1:28 PM, paul swed <paulswedb at gmail.com> wrote:

> Charles I did see the slew rates and bandwidth and came to the conclusion
> those were not issues. Thats why I will build up a test board pretty
> quickly to confirm the component values still work. They should. It also
> means I do not need to wait for the LM873s to showup. Lots can be wired
> without the LMC6484s.
> Regards
> Paul
> WB8TSL
>
> On Mon, Nov 23, 2015 at 12:16 PM, Charles Steinmetz <csteinmetz at yandex.com
> > wrote:
>
>> Paul wrote:
>>
>> post down conversion to 10 Khz I was scratching my head as to why not
>>> the TL08X series.
>>>
>>
>> Input voltage noise.  Unless you need the low input current of the FET
>> part, there is no need to take the noise hit.  If you *do* need the low
>> input current, there are 4 or 5 generations of FET-input opamps that are
>> all far superior to the TL0xx parts.  Take a look at the OPA134/2134/4134,
>> for example.  (I haven't used TL0xx opamps since the '70s.)
>>
>> BTW:  I suggested using NE5532s instead of LM387s and said they were
>> better in every way.  Comparing the LM387 to the NE5532, one might notice
>> that the bandwidth spec of the 5532 is lower (10MHz) than that of the 387
>> (15MHz).  But what is important for most applications is not the
>> small-signal BW, it is the power BW (full-output BW), which depends on the
>> slew rate, not on the SSBW.  The 5532's 9v/uS slew rate supports a PBW of
>> 140kHz, while the 387's PBW is only 75kHz (S/R is not stated).  (This tells
>> us two things -- first, that the 387's slew rate must be <5v/uS; and
>> second, that the 387 has less phase margin than the 5532.)
>>
>>
>> Best regards,
>>
>> Charles
>>
>>
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>