Quansheng UV-K1 (8) Volume Knob Modification (easy!)
Improving Volume Knob Resistance
The volume knob on these radios turns very easily. While this is convenient for casual use, it can be frustrating in other scenarios where the volume might be accidentally bumped down until it is too quiet to hear.
To solve this, you can add an O-ring under the volume knob to increase resistance. I tested two different sizes, both with a 15mm Outside Diameter (OD):
2.5mm Thickness: This size did not seem to add much noticeable resistance to the knob.
3.0mm Thickness: This size worked perfectly for my needs. While the knob isn’t difficult to turn, it now requires you to hold the radio in one hand while turning the knob with the other. This significantly reduces the chance of changing the volume by accidentally brushing against it.
Material Choice
Either nitrile or fluorine O-rings will work. However, if you operate your radio in cold environments, nitrile is likely the better choice. I used fluorine O-rings simply because they were more readily available at the time of my order.
Removing the Knob Safely
Removing the knob is the most difficult part of the process. It is not secured by glue or screws; rather, it is a "press-fit" (held in place by friction). To avoid damaging the radio, keep the following tips in mind:
Use Non-Metallic Tools: Use a plastic or nylon "spudger" to pry the knob off. Avoid metal tools, as they can easily gouge the plastic housing or the knob itself.
Support the Knob: Be sure to apply pressure evenly and support both sides of the knob. This prevents placing uneven stress on the internal electronics and the potentiometer shaft.
Technique Reference: For a visual guide, [see this video at the 9:40 mark]. Note: Although the person in the video uses a metal tool and accidentally damages the plastic, his general technique for prying the knob upward is a good example to follow.
Here is the o-ring next to the removed knob.
Place the o-ring on the knob.
Hold the radio upside down and carefully place the knob on the shaft. Note the shaft is d-shaped and the knobs must be positioned correctly on it. Make sure the 0-ring is centered on the knob and not hanging off to the side.
Squeeze the knob on the shaft until it is firmly seated.
Done!
