You can't use the square wave? You could put in a resonant circuit that will
select the fundamental but other issues arise, such as phase noise and harmonic
content. How much harmonic content can you tolerate?
There is a host of ways to do this job but much depends on your requirements.
Bob K6DD
For the life of me I can't find the link to the schematic or any mention of
it in the archives. Google fail. However, I was able to find some screen
shots and pictures from the Chebyshev filter that I built from the docs
that I originally found here. This should get you started if you want to
r
Hi,
What distortion level would you like to achieve?
Regards,
Vasco Soares
Em 2015-07-16 18:49, skipp Isaham via time-nuts escreveu:
re: 10MHz Square to Sine Wave Conversion
The GPSDO I recently acquired outputs a 10 MHz square wave. I'd like
to convert it to a sine wave and I am looking for
Here's the URL to the document I was referring to:
http://www.w1ghz.org/small_proj/10MHz_Filter_for_GPS_Reference.zip
And I see in my simulation I have the inductor and cap in the center of the
schematic reversed, however it was built properly.
-Bob
On Thu, Jul 16, 2015 at 3:24 PM, Bob Darlingt
Hi
The simple approach is to buffer it with a few ‘125 buffers in parallel. Then
convert
to sine wave with a T-network matching section. There are a lot of matching
calculators
on the web. Something in the 50 to 200 ohm input range and 50 ohm output is a
reasonable
way to go. More gates and hig
All you need is a 10 MHz low pass filter.
How far down do you need the harmonics/spurious to be?
If 40 dB suppression of the 2nd and 3rd harmonics is adequate,
(you can't see the distortion with the eye on an oscilloscope)
you can make your own for about $2 in parts, not including a PC board or
h
How good does the sine wave need to be? The usual method is to use a
low-pass filter A CLC "pi" filter works.
On Thu, Jul 16, 2015 at 10:49 AM, skipp Isaham via time-nuts
wrote:
> re: 10MHz Square to Sine Wave Conversion
>
> The GPSDO I recently acquired outputs a 10 MHz square wave. I'd like
Skipp wrote:
The GPSDO I recently acquired outputs a 10 MHz square wave. I'd like
to convert it to a sine wave and I am looking for suggestions
A simple Tee network works well (see below). The input resistor can
be chosen from 50 to around 200 ohms to suit the particular output
circuit used
Hi Skipp,
I suggest you a simple passive filter with harmonic notch as this:
http://www.timeok.it/files/5_and_10mhz_low_pass_notch_filter.pdf
Obviously you have to made the 10MHz version,
Ciao,
Luciano
On Thu 16/07/15 19:49 , skipp Isaham via time-nuts wrote:
> re: 10MHz Square to Sine Wav
A would have thought a simple band pass filter would do the job by tuning
out the harmonics.
On Fri, Jul 17, 2015 at 3:49 AM, skipp Isaham via time-nuts <
time-nuts@febo.com> wrote:
> re: 10MHz Square to Sine Wave Conversion
>
> The GPSDO I recently acquired outputs a 10 MHz square wave. I'd like
Hi,
A while back I ordered an item of equipment from a very excellent eBay seller,
johnkw40. He may be a member of the list, I'm not sure. He included a schematic
for a low pass filter circuit to filter a 10 MHz square wave to a sine wave.
A quick analysis shows that it is a 5th order chebyshev
I was thinking along these lines.
Cooking up a 3-pole filter in the form of a Pi-filter should be a good
start, and then add traps for third and possibly fifth overtones that
will not get much damping initially can be done if you need it pretty clean.
Cheers,
Magnus
On 07/17/2015 04:07 AM, Gr
It is the simplest solution because you have not to tune the notch filter but
you have -20dB on 2nd harmonic and -40dB for the third instead -50dB (min for
both) if you made a low-pass with notch filters.
Luciano
On Fri 17/07/15 05:10 , D W wrote:
> Hi,
>
> A while back I ordered an it
Hi
If you run a filter with a shunt capacitor input (as opposed to the series L
proposed by Charles, the current in the driving gate goes
way up. It’s driving a short at the harmonic frequencies and it does not like
this. If you want more power with a simple T, just run the
T. No resistor at t
Hi
But your 3 pole will not be as good as my 5 pole. My 5 pole will not be as good
as the next poster’s
13 pole. My 5 added traps will not do as much as the next poster’s 13 traps.
What *will* happen as all of these parts are added:
1) It becomes a real mess to properly lay out and align
2) Eve
I have a Mini-Circuits BLP-10.7 that I picked up at a Flea Market that
does the job.
And no, I do not want to sell it !!
73, Dick, W1KSZ
On 7/16/2015 10:47 PM, Jason Ball wrote:
A would have thought a simple band pass filter would do the job by tuning
out the harmonics.
On Fri, Jul 17, 2015 a
Hi
If you attach a filter with a shunt capacitor (capacitor to ground) at it’s
input to the output of a logic gate,
that gate will pull far more current than it would without a shunt capacitor
being present. You can try to
minimize this with a series resistor, but that’s only a partial fix.
Bo
Charles Wenzel has very simple but good working solution, here is :
http://www.wenzel.com/documents/waveform.html
On 7/17/2015 8:20 AM, Richard Solomon wrote:
I have a Mini-Circuits BLP-10.7 that I picked up at a Flea Market that
does the job.
And no, I do not want to sell it !!
73, Dick,
Before I waste time simulating too much...
Does anyone have any intuition around temperature dependence of these designs?
Is one 'style' significantly better than another?
I'm far more concerned about phase shift of the fundamental during temperature
swings than I am relative harmonic levels/ph
Bob,
I intended nothing aiming for "perfect".
My initial proposal was actually for a 1 pole low-pass and then a block
at 30 MHz for third overtone, but I never put that in mail-form.
Cheers,
Magnus
On 07/17/2015 02:57 PM, Bob Camp wrote:
Hi
But your 3 pole will not be as good as my 5 pole.
Hi
The narrower the bandpass of the network, the more delay it will have. The
more delay it has, the more phase shift you will have over temperature. With
a “low Q” T network, the phase shift is pretty small. It is likely you will
have
as much shift in other parts of your system as in a Q = 1 ma
Hi
Ok, so one more vote for a gate driving a T network.
Bob
> On Jul 17, 2015, at 2:21 PM, Alex Pummer wrote:
>
>
>
> Charles Wenzel has very simple but good working solution, here is :
> http://www.wenzel.com/documents/waveform.html
>
>
> On 7/17/2015 8:20 AM, Richard Solomon wrote:
>> I
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