The act of squaring up the waveform alone might not do much harm, depending
on the extent
to which the phase noise on said waveform has already been filtered off.
But it's mainly when
the signal gets divided down by large ratios that the difference would
become really noticeable.
For example,
Atilla wrote: "Yes. This effect has been known for a few decades at
least. What kind of puzzles me is, that I have not seen a mathematically
sound explanation of it, so far. People talk of aliasing and sampling,
but do not describe where the sampling happens in the first place. After
all, it's
Am 16.09.2018 um 23:11 schrieb Attila Kinali:
On Sun, 16 Sep 2018 22:08:19 +0200
Gerhard Hoffmann wrote:
I'm also not a fan of using slowish, slew-rate challenged logic as a
replacement
for a low pass. When I want a low pass, I make it from nice,
time-invariant RLC.
Unfortunately, using a
Am 16.09.2018 um 20:00 schrub Mark Goldberg:
For a radio BFO you want something with low phase noise (low jitter). The
SI5351 is not designed for that, and it's jitter spec is 70 ps, which is
pretty noisy. It even has a spread spectrum mode that would be even worse.
They do have other parts
I'd been thinking, in an admittedly non-rigorous sort of way, about this
matter for some years.
As I see it, it is certainly true that the phase of an oscillator's output
is a continuous funciton
of time. It could be described as a continuous ramp, whose slope
corresponds to the frequency,
and
Time-Nuts,
There were no takers on helping me sort through stuff I'd like
to give away so I've begun the task myself. so far I've given away some
SX28AC IC's and an SX-Key programmer.
I have 8 distribution boards to pass on.
Link to Pictures of Items:
For a radio BFO you want something with low phase noise (low jitter). The
SI5351 is not designed for that, and it's jitter spec is 70 ps, which is
pretty noisy. It even has a spread spectrum mode that would be even worse.
They do have other parts designed for low jitter (< 1ps). Leo Bodnar's
On Sun, 16 Sep 2018 22:08:19 +0200
Gerhard Hoffmann wrote:
> I'm also not a fan of using slowish, slew-rate challenged logic as a
> replacement
> for a low pass. When I want a low pass, I make it from nice,
> time-invariant RLC.
Unfortunately, using a low pass after the divider will not
Moin,
On Sat, 15 Sep 2018 08:38:55 -0700
"Richard (Rick) Karlquist" wrote:
> On 9/15/2018 3:26 AM, Attila Kinali wrote:
>
> > possible logic family for the task. Otherwise the harmonics of the
> > switching of the FF will down-mix high frequency white noise down
> > to the signal band (this is
My (formerly) trusty 5135A crapped out a while back, and I've been
trying to fix it recently. I have tried in vain to find some particular
details on the remaining problem circuit. I haven't found any kind of
manual for it, but found one for the 5120A, an apparently similar, older
model.
The
Just the info I wanted! Thanks, N0UU
> On September 16, 2018 at 8:49 AM Didier Juges wrote:
>
> Not the same part number but probably similar in terms of performance:
>
>
> http://www.ko4bb.com/getsimple/index.php?id=microprocessor-crystal-oscillator-comparison
>
> Bottom line:
Am 15.09.2018 um 17:38 schrieb Richard (Rick) Karlquist:
If you divide by something that is not a power of 2, then it is
important
that each stage produces an output waveform with a 50% duty cycle.
Otherwise
flicker noise which has been up-mixed by a previous stage, will be
down-mixed
into
Hi Chris,
On 09/16/2018 07:22 PM, Chris Waldrup wrote:
> How about using a ProgRock on Hans Summers QRP Labs website? This is a
> programmable crystal replacement.
I have one of those but have not had the time to put it up for a real
test. Also got the GPS module that should fit, as you can
How about using a ProgRock on Hans Summers QRP Labs website? This is a
programmable crystal replacement.
Chris
KD4PBJ
> On Sep 14, 2018, at 8:06 PM, paul swed wrote:
>
> The beauty of a $2 arduino and a drop of code snitched from Engineer google.
> OK enough of that back to the thread.
>
Hi
Coming back to the basics of the design:
If you are playing with a normal radio, a BFO that drifts under a few Hertz is
going to be pretty much un-noticable. Drift is a bit of an elastic term in this
case
since it can cover a bunch of different parameters on an oscillator
(temperature
as
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