[time-nuts] KD2BD WWVB receiver/decoder in QEX
dgminala at mediacombb.net
Sun Nov 22 18:52:28 EST 2015
I found all ICs except the VCXO here in the US, from only two sources;
Mouser and Unicorn Electronics. A couple substitutions can be made without
affecting the circuit. The 78L06 is the only change i made... substituting
an LM317L adjustable regulator for the fixed 6-volt reegulator.
I've attached a PDF of the IC list, sources and price.
Hope this helps,
Nick Sayer via time-nuts wrote:
>> On Nov 22, 2015, at 7:47 AM, paul swed <paulswedb at gmail.com> wrote:
>> As mentioned a nice answer to the wwvb modulation change.
>> I looked up the parts and it seems that they have gone into the NOS
>> state. Though you can get some from digikey and such especially in
>> the SOIC package. Also the VCO isn't available.
>> It appears that the Chinese sight has the lmc6484 and LM387n at
>> reasonable prices for small quantities. Most likely will order from
>> Have not checked out the PIC chip yet.
>> The 74HCXX are common and reasonable.
> That’s kind of a shame. I’m sure a redesign with modern SMD parts
> could be accomplished.
> The big question is how the stability of a wwvb disciplined
> oscillator would compare to a GPS disciplined one (all other things
> being equal). Well, it’s a big question for me, since I have no idea,
> but I imagine simply asking here will give an immediate answer. :)
> I’d have to guess that the PLL would behave better given a 60 kHz
> reference rather than a 1 Hz one. But how stable is that 60 kHz
> reference after going through, what, a thousand miles of ionosphere
> or so? _______________________________________________
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