Locked Alfa NHA Cards

[t-mar]

I have been working on a setup using a raspberry pi zero 2w, a pi 3b, and two alfa NHA cards. Unfortunately there have been many problems surrounding the max range of my system, as it usually drops out at about 500m in areas without interference. After seeing the post below, I checked both network cards using raspian bullseye and found both to be locked to the GB region, and therefore limited to 20dBm. So I went through the process of changing the regulatory db to increase the power in rasbian bullseye on one of the two cards, and it seemed to work, and so I went to do the same procedure in Open.HD, and found that the TX power had already been set to 30 dBm. Has the regulatory.bin file been modified to allow full tx power in the Open.HD 2.0.8 image?

Also, any tips for how to improve the range of this system with the hardware I have in place? It is a ground vehicle, and interference should not be a problem where it is being operated.

Thanks in advance.

@ABLomas

• I got “Locked to GB region” Alfa NHA cards (also “tube” version used inside this device), which means that with current regulatory.bin has output power between 28 and 40mW (using custom regulatory.bin outputs > 100mW of power but re-generating custom DB for every release is meh), so range is not so great - smth like 2km with omni antennas with “quality settings”, ~5km max (there is directional antenna mount, but then setup becomes bigger…)
• 2.4G setup is extremely sensitive to anything around. It works well if i fly alone in field, but becomes unusable in any FPV meeting or with other flyers. NHA cards do not use narrow band input filters, so even if you use something like 2.3/2.5G (far, far away from ISM frequencies) - any phone with wifi turned on (no need for hotspot), any bluetooth, any remote - literally anything not in airplane mode - will kill your range up to being unusable 100m away. Avoid 2.4G if you fly in groups.