One problem that is evident when a simple longtailed pair
(differential amplifier) is used to convert a sine wave to a square
wave is the tilt that is evident in the waveform when the output
transistor is conducting. This is due to feedthrough from the input
signal via the emitter base capaci
One problem that is evident when a simple longtailed pair (differential
amplifier) is used to convert a sine wave to a square wave is the tilt
that is evident in the waveform when the output transistor is
conducting. This is due to feedthrough from the input signal via the
emitter base capacita
James wrote:
I'm trying to square the 10Mhz output from a Thunderbolt GPSDO, and failing
miserably. I'm still very new at this so please forgive my ignorance. I
thought it was going to be easy. I have tried diodes, comparators,
op-amps, Schmidt trigger buffers,regular buffers, inverters, and
dif
Fellow clock-tickers,
Just a point of interest. I have successfully upgraded my Odetics 425
by replacing its original quartz OCXO with an Efratom (Ball) FRS-C series
rubidium oscillator.
The process was pretty simple: Wire the FRS-C in, with practically
identical wiring to the
James Fournier wrote:
Hello All,
I'm trying to square the 10Mhz output from a Thunderbolt GPSDO, and failing
miserably. I'm still very new at this so please forgive my ignorance. I
thought it was going to be easy. I have tried diodes, comparators,
op-amps, Schmidt trigger buffers,regular buffers
Feed it through a 10M0 Hz crystal filter (easy to make
out of one crystal) then put the output of the filter into
a fast comparator. It is commonly done in certain
types of DDS synthesizers. Is that clear enough or do
you need a picture?
Greg
On 3/23/2011 6:57 PM, James Fournier wrote:
Hello A
Hello All,
I'm trying to square the 10Mhz output from a Thunderbolt GPSDO, and failing
miserably. I'm still very new at this so please forgive my ignorance. I
thought it was going to be easy. I have tried diodes, comparators,
op-amps, Schmidt trigger buffers,regular buffers, inverters, and
differe
On Wed, Mar 23, 2011 at 4:23 PM, Bob Camp wrote:
> Hi
We're only driving a motor here, low distortion is hardly a requirement.
You mean this is for a mechanical clock? Then telk of a 512K LUT is
pointless. You need only 8-bit samples and to shore 90 degrees of the
sine function takes 64 bytes.
Hi David,
Is it possible for you to upload your scan to KO4BB (once it is done)?
I am also looking for this manual and I am sure there are more people
lurking.
Stijn
>> Date: Tue, 22 Mar 2011 18:29:33 -0700
>> From: Dan Rae
>> Subject: [time-nuts] Fluke 203A Distribution Amplifier Manual?
>>
>>
Hi
You can do the drop / add pulse thing with a sub 50 cent micro. The only real
sorting function is that you rule out the ones that won't take an external 10
MHz clock. If you want pseudo sine wave with PWM that likely will fit. We're
only driving a motor here, low distortion is hardly a requ
On Wed, Mar 23, 2011 at 3:18 PM, Mark Sims wrote:
>
>> it doesn't have to be THAT complex. A 50 entry LUT is however expensive.
> Yeah, might even cost as much as a whole US dollar (ragged as they are these
> days). 512 kbyte EPROMs can be had for under $1... connect the outputs to a
> re
Date: Tue, 22 Mar 2011 18:29:33 -0700
From: Dan Rae
Subject: [time-nuts] Fluke 203A Distribution Amplifier Manual?
Does anyone know of a source for this one? It is a sort of functional
clone of the -hp- 5087; mine is modified for 1 in and 9 10 MHz
outputs.
I have tried all the usual suspects..
> it doesn't have to be THAT complex. A 50 entry LUT is however expensive.
Yeah, might even cost as much as a whole US dollar (ragged as they are these
days). 512 kbyte EPROMs can be had for under $1... connect the outputs to a
resistor ladder (might need an output latch), filter, voila
On 03/10/2011 11:41 PM, Robert LaJeunesse wrote:
Poor man's solution: Use an Arduino to read the Thunderbolt 1PPS and lock a 50Hz
(or 60Hz) square wave to the 1PPS. Any resulting jitter can likely be kept in
Here is an even poorer man's solution (and plug):
A DDS using both compare outputs of
Just thinking here about making a 60M0 Hz oscillator and
phase locking it to the 10M0 reference. Then divide the
60M0 by 1e6. Youve got a perfectly locked 60 Hz square
wave.
For low harmonic 60 Hz sine wave one can go for 480 Hz
to start a Walsh -Hadamard converter. Take 60M0 divide
by 125 (easy
On 03/22/2011 11:45 PM, Hal Murray wrote:
mag...@rubidium.dyndns.org said:
On the other hand, it would not be difficult to make a DDS which hit 60/
1000 exactly. Reducing it by 20 on each side you get 3/50 so a 19
bit accumulator (mod 50) incrementing with 3 on every 100 ns perio
Indeed you left out one other. Congress will tax the ionosphere so some
times there simply is less of it. Need to close the budget gap somehow.
On Wed, Mar 23, 2011 at 7:38 AM, Bob Camp wrote:
> Hi
>
> Deep dips in WWVB can be from several sources. One is the sunrise / sunset
> thing that seems
Hi
Deep dips in WWVB can be from several sources. One is the sunrise / sunset
thing that seems to happen on a fairly regular basis. Once you take that out, I
suspect that great big storms like the one between you and Colorado just might
have some influence. Any antenna, even VLF is going to be
18 matches
Mail list logo
