?

At times, the noise contributes to this as well. Solder a 0.1uf capacitor across the pot's ground and wiper lugs.

- f

On Tue, Dec 27, 2016 at 10:05 AM, Ashhar Farhan <farhanbox@...> wrote:

It should work if you have derived the same power line as the Arduino's 5v line. in the function doTuning(..) there is a line that triggers the step up beyond 1010, you could reduce the 1010 to 950 and try it.

- f

On Tue, Dec 27, 2016 at 10:03 AM, Joel Caulkins caulktel@... [BITX20] <BITX20@...> wrote:

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Farhan,

I breadboarded your Raduino to try it out, and I have to say I rather like it, however sometimes when I turn the pot all the way clockwise it won't go into the mode that counts up at a higher step rate. It will always work when rotating it down or counter clockwise. Do you have a idea why it does this? I have tried 3 different 10K pots with the same results. Is this a function of the 5V supply needing to be exactly 5V.

Joel Caulkins

KB6QVI

On Dec 26, 2016, at 6:44 PM, Ashhar Farhan farhanbox@... [BITX20] <BITX20@...> wrote:

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John,

the step size is 50 Hz as shipped. the tuninng is not by a rotary encoder. it is with a potentiometer. here is how it works:

- The tuning pot is connected to the ground and 5v lines. The middle wiper is connected to the analog input of the Arduino.

- The Arduino can read the setting of the pot as 0 to 1024.

- This corresponds to a range of 1024 x 50 Hz, approximately 50 KHz or range.

- When the pot is turned fully to the left, (the analog port reads less than 10), the frequency starts ticking down in steps of 10 Khz at about five times second

- When the pot is turned fully to the right, (the analog port reads more than 1010), the frequency starts ticking up in steps of 10 Khz at a similar rate

Why was this done??

- The pot gives you 1000 distinct 'steps' in its range, a low cost rotary encoder can give you not more than 96 (24 steps x 4 phases).?

- Pots are in everybody's junkbox, it was cool to explore a new way of tuning

- It is surprisingly easy to use. I no longer have to keep spinning the tuning wheel to get from one end of the band to another

There is a Easter egg with a 'function button' in the Raduino code. If you can wire up an additional push button, you can get dual VFOs. If you can wire up an additional transistor, you can get RIT (receiver incremental tuning).?

- f

As there is a full Arduino Nano on-board, you can reprogram it to anything you like

On Tue, Dec 27, 2016 at 7:57 AM, jjack718@... [BITX20] <BITX20@...> wrote:

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Can anyone tell me what the tuning step size is for the SI5351 / Radunio version of the radio??? Any info on the DDS noise pedestal - - does the audio sound as clean as the analog VFO version or does it get that 'grainy digital' sound??

Thanks

John ?N9BTM / YN8BTM