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, Graham / KE9H wrote:
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
housing.
Feel free to copy the low pass filter (L1, C9, C10) from here:
http://openhpsdr.org/wiki/index.php?title=EXCALIBUR
Or for about $35, you could get the same performance from an inline BNC
filter from Minicircuits.
http://www.minicircuits.com/pdfs/BLP-10.7+.pdf
If you need more harmonic suppression, buy two and put them in series.
--- Graham
==
--- Graham
==
On Thu, Jul 16, 2015 at 12:49 PM, 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
to convert it to a sine wave and I am looking for suggestions and info re
any reasonable pre-made circuits and/or boards. No sense reinventing the
wheel if I can avoid it.
Otherwise I will start from scratch and make a new wheel....
Thank you in advance for your replies.
Regards,
skipp
skipp025 at yahoo dot com
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