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Author Topic: Arduino DDS VFO  (Read 104839 times)

KH2BR

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Arduino DDS VFO
« on: May 08, 2014, 10:43:57 AM »

I came across this Arduino vfo project that I am sure a lot of you can use. I will give it a try and see what happens.

http://www.ad7c.com/projects/ad9850-dds-vfo/

In addition to what this does, I will need keying for a cw transmitter plus switching for a BPF  or LPF, so we will see
what happens. I am a novice at this, I guess most are.
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K4LJA

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RE: Arduino DDS VFO
« Reply #1 on: May 08, 2014, 01:12:58 PM »

KH2BR -- please keep us posted on your progress.  Just wonder, tho', why an Arduino would be preferred over a nice, small DDS vfo -- which are often easily keyed for cw.

Randy  K4LJA
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KH2BR

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RE: Arduino DDS VFO
« Reply #2 on: May 08, 2014, 02:34:52 PM »

the arduino is the programmable controller for the small dds board. It also provides the digital signals to drive the display and accepts control inputs to manipulate the software.
the dds bord is just a board that will do nothing if it does not have some type of a controller. you don't have to know anything about programing it , just copy the makers open source code,
and duplicate his circuitry. after a learning how it works and some code examples, you should be able to make it do what ever you want. Its all a fun learning experience that can be put to practical use.
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G4AON

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RE: Arduino DDS VFO
« Reply #3 on: June 24, 2014, 04:20:34 AM »


In addition to what this does, I will need keying for a cw transmitter
You could use the keying and control circuit from the Wes Hayward Universal QRP transmitter:

http://www.arrl.org/files/file/Technology/tis/info/pdf/0604028.pdf

Or my variation of it, with improved keying wave shape:

http://www.qsl.net/g4aon/g4aon_tx/

73 Dave

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W4OP

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RE: Arduino DDS VFO
« Reply #4 on: June 24, 2014, 04:13:28 PM »

I switched from the DDS VFO's to the Si570 with PIC controller. Much cleaner firmware,and filter select pins. This from the G6LBQ site.

Dale W4OP
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KB8BAB

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RE: Arduino DDS VFO
« Reply #5 on: September 15, 2014, 04:42:31 PM »

 ;D Lots of ways to do this......I did a version using an Arduino, great learning experience....Still playing with it.
See info at www.kb8bab.com
I have to update the software on the site, its a bit dated....

73
Bart, KB8BAB
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KB1GMX

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RE: Arduino DDS VFO
« Reply #6 on: February 01, 2015, 09:23:47 AM »

I have a PIC-EL and just recranked the DDS30 code for the cheapie 9850 boards.
I then copied that to a spare 16F684 for use with a 16x1 LCD and a home brew
optical encoder.

Many people out there playing with the 9850 DDS and SI570.


Allison
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AK0B

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RE: Arduino DDS VFO
« Reply #7 on: July 11, 2015, 06:05:31 AM »

What would be consider the best incremental encoder to use?

The KY-040 is reasonable price - what are the pro and cons?

Stan AK0B
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KV6O

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RE: Arduino DDS VFO
« Reply #8 on: October 03, 2015, 02:11:12 PM »

http://www.kv6o.com/wordpress/2014/10/10/a-dds-vfo-for-the-ts-520s/

Some experimenting I did last year.

Steve
KV6O
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