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ATU100 intermittently switching to auto on TX #atu-100

 

Hi all -

My ATU100 is working great - I think it will tune a rusty nail - I was able to tune my 80 meter off center fed dipole on 160 - something I was unable to do with my other name brand tuner!? And then I made my first ever top-band contacts - whoo hoo!

One issue though is the tuner will very occasionally switch in to auto mode on Tx - without pressing the button.? I have caps to ground on the Auto and Bypass buttons.? ?The enclosure is one of the 3D printed plastic ones.? Is some shielding needed or recommended?? Anything else to look for?

73.
Dean
KK4DAS
 

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Hi Dean,

I suggest you decouple the input pins as close to the microchip processor as possible. To me it looks like RF is entering and beating the debounce routine. If possible all input pins should be decoupled. RF might actually go into another input pin than expected.? Hope you find solution. best regards, Onno



On 24-11-2021 14:49, Dean Souleles wrote:

Hi all -

My ATU100 is working great - I think it will tune a rusty nail - I was able to tune my 80 meter off center fed dipole on 160 - something I was unable to do with my other name brand tuner!? And then I made my first ever top-band contacts - whoo hoo!

One issue though is the tuner will very occasionally switch in to auto mode on Tx - without pressing the button.? I have caps to ground on the Auto and Bypass buttons.? ?The enclosure is one of the 3D printed plastic ones.? Is some shielding needed or recommended?? Anything else to look for?

73.
Dean
KK4DAS

 

On Thu, Nov 25, 2021 at 04:54 AM, Onno PA1AP wrote:
I suggest you decouple the input pins as close to the microchip processor as possible. To me it looks like RF is entering and beating the debounce routine. If possible all input pins should be decoupled. RF might actually go into another input pin than expected.? Hope you find solution. best regards, Onno
Thank you Onno,

I'll give that a try - have to come up with a better way of attaching to those tiny solder pads for the buttons and a ground pin I can connect to.? The caps right now are on the front panel so there are 4-6 inches of wire to act as antennas between the front panel and the board. I didn't put one on the tune button because I thought it was already on the board.? I'll have to double check.

73,
Dean
KK4DAS
 

Twist wires is also ok sometimes..

Le?jeu. 25 nov. 2021 ¨¤?19:42, Dean Souleles <dsouleles@...> a ¨¦crit?:
On Thu, Nov 25, 2021 at 04:54 AM, Onno PA1AP wrote:
I suggest you decouple the input pins as close to the microchip processor as possible. To me it looks like RF is entering and beating the debounce routine. If possible all input pins should be decoupled. RF might actually go into another input pin than expected.? Hope you find solution. best regards, Onno
Thank you Onno,

I'll give that a try - have to come up with a better way of attaching to those tiny solder pads for the buttons and a ground pin I can connect to.? The caps right now are on the front panel so there are 4-6 inches of wire to act as antennas between the front panel and the board. I didn't put one on the tune button because I thought it was already on the board.? I'll have to double check.

73,
Dean
KK4DAS

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