dentless encoder tuning

[bubnikv]

An electro-mechanical encoder such us the one in the mini-ATS receiver could be modified by removing the detent. Such modification has two impacts:

1. Tuning is smooth. It allows one to select a small tuning step while spinning relatively fast. This is very convenient when scanning for narrow band signal such as morse.

2. Tuning resolution could be increased 2x or 4x, depending on the detent type. Indeed, the firmware could detect each edge (raising, falling) of each of the two signals.

I did that on my modified ATS-3b morse transceiver:
https://youtu.be/lwg7_PbMSBc?si=CrZX831r0AboHkUS&t=22

Removing the detent is easier than it sounds: Just open the encoder, remove the spring and bend/clamp the steel housing back. I am not sure though how easy it is to source such detent-less encoder.

Firmware would have to be modified to make use of full encoder resolution for tuning while introducing slower encoder stepping for menus, possibly with beeps simulating the detent.

Thanks for considering and 73,
Vojtech OK1IAK

[bubnikv]

Removing dentent from an encoder is not that uncommon as it sounds.
https://www.youtube.com/watch?v=YYPsISzesLs
https://www.youtube.com/watch?v=RiD69Iesu1w
https://ubitx.net/2018/03/04/remove-detents-from-your-encoder/

[bubnikv]

Also some of the encoders could be bought without a detent

https://www.digikey.com/en/products/filter/sensors-transducers/507?ColumnSort=0&ColumnSort=0&FV=ffe001fb&FV=ffe001fb&page=1&page=1&pageSize=25%3Fk%3Drotary%20encoder&pageSize=25&pv1989=0&pv1989=0&pv394=2&pv394=2&quantity=0&quantity=0&s=N4IgjCBcoLQExVAYygFwE4FcCmAaEA9lANogCsIAugL7X4KSnoGoCG6AngATYB2SBACbZ0IfGJBVqQA

A common 24 pulse encoder reaches 48 step resolution with detent removed if both the raising and falling edge are counted. Such resolution makes the tuning "analog like" enough.

[EmEiBee]

For this project, it's a bit off-topic due to space constraints and probably overkill. However, I'd like to point out two other options.

1.: Optical Encoders
In my experience, Chinese encoders don't last very long. I've had to replace so many encoders from a variety of devices (oscilloscopes, laboratory power supplies, microwaves, coffee makers, etc.) that I've converted to optical encoders for special devices and when space allows. These are also available with and without detent, and they simply don't break.

2.: Ironless Stepper Motors / BLDC
Small, ironless stepper motors are particularly suitable for devices where you want to achieve that soft, full feel, like the old tube radios with an extra flywheel on the dial axis, especially if you add a flywheel yourself.
Of course, you have to put in a lot of effort when it comes to processing the signals, but the effect is unbeatable and also completely wear-free.