By using the NE5532 ICs I have an operational KD2BD wwvb receiver and it has just locked for the first time. Made a few other changes like the vco loop chip is a TLE2071. Thats because it was available much like the article. I also used a PTI 10 MHz oscillator. A nice unit picked up at a flea market so really keeping with the whats available mode. I built only the elements needed to lock the oscillator. Thats still a lot of stuff. There is room to add more pieces if needed. No need for the microprocessor yet.
WWVB is being itself tonight. I think MSF is doing a great job of interfering. Happy Thanks giving to everyone. Regards Paul WB8TSL On Mon, Nov 23, 2015 at 7:41 PM, paul swed <paulsw...@gmail.com> wrote: > 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 <paulsw...@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 < >> csteinm...@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 >>> >>> >>> _______________________________________________ >>> time-nuts mailing list -- time-nuts@febo.com >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >>> >> >> > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.