Question : In the 74HCT9046BCN - does a high on the inhibit line Knobble
the P/F detectors as well as the VCO?
On Mon, May 7, 2018 at 10:34 PM, donald collie <donaldbcol...@gmail.com>
wrote:
> Thankyou to all who responded to my querie - I`ve got 5 74HCT9046BCN on a
> slow boa
Thankyou to all who responded to my querie - I`ve got 5 74HCT9046BCN on a
slow boat from China. They will retrofit the projects where I used a 4046
without much pcb surgery. PLL`s are fun, especially when yo can watch them
lock on a Tek 7834 :-) I interloaned the weighty tome again, and am
So to be lowest noise, an oscillator should have the highest Q resonator
possible in its feedback loop, operate in class "A" [for maximum
linearity], and utilise active amplifier device(s) that contribute the
least noise [both amplitude, or 1/f], and phase. This latter implies
operating the active
Does any limiter, soft or hard, [and perhaps any nonlinearity of power
term 3 or greater in the amplifier of an oscillator] cause the "baseband
1/f noise to translate up to the resonator frequency [a form of
crossmodulation]?. I wonder this because
phase noise vs freq plots look a bit like the
...Don.
On Mon, Jan 8, 2018 at 1:02 AM, donald collie <donaldbcol...@gmail.com>
wrote:
> Does any limiter, soft or hard, [and perhaps any nonlinearity of power
> term 3 or greater in t
Wien bridge and bridged T oscillators often use a thermistor [lamp] to
set the amplitude below saturation, for low distortion, but i`ve seen the
diode AGC method used.
Conversely, you could use a thermistor to set the output of a crystal or
L/C oscillator. One other method seems to be to let
I`ve just bought two GPSDO`s from China @ US$9-50 each [This is not an
error!] They are stated as being new, and use a Trimball dual oven OCXO. I
plan to run these in parallel [2 antennas, 2 feedlines, and 2 GPSDO`s] It`s
been said that a man with two watches is never happy - unless, of course,
nna. You
> *could*
> > average the result off of the two. That might improve things by sqrt(2).
> My
> > experience is that the bumps and lumps (when they do occur) are not the
> > sort
> > of thing that averages out nicely…..
> >
> > Bob
> >
> > &
I have 4 frequency synthesiser projects, each using HEF4046BCN`s, but have
recently read that this CMOS IC has a design flaw. What would be a better
chip to retrofit? I`m thinking perhaps a HEF74HC4046AN [that`s if it
doesn`t have the same bug], or a 74HC7046AN - which is similar. Both these
could consider the NXP 74HCT9046A as a replacement. It is an improved
> version of 4046. However, you do need to study the spec sheet as it is a
> bit different, but in a good way.
>
> I have included an attached PDF of the spec sheet, if it makes through the
> mail list server.
>
>
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