@starcms, Not talking about DFS, which all these units have, google 5 GHz and DFS, or look at *link ommited* 5 GHz table for channels impacted by DFS. But DFS does enter into the discussion as 5 GHz channels are restricted as to behaviour by DFS.
*link ommited* is loadable .dts file that describes HW attributes/parameters of device, including radios. This file is under control of anyone compiling an image, and therefore can be freely modified within the confines of available HW, and said HW capabilities. So, with a loadable DTS, an image could conceivably operate a device outside of legislated values (frequency,power) for a locale. If an image cannot override those parameters with a loadable DTS, this is not possible(well, that would be the intent).
Is a V1 flavour better? Owner would have to make that decision, I have a shelby-v2, not too concerned about the difference(I am not in the US, which is supposedly driving this by way of FCC). All channel/power settings are available, just restricted to the legal settings based on locale. Yes you can change locale, but you are using the embedded parameter table, not one that was loaded with your image.
Thanks for all the detailed info! I've been lurking on these board since I got my caimen v1, and been running @david's fantastic builds for almost as long, but I definitely don't know as much as I would like to. I know you weren't talking about DFS (which is one of the few things I do understand), but I mentioned it because as you said it does enter into the discussion. Thanks for your very detailed explanation of what DTS is!
So all wrt 1200/1900/3200 models have DFS? I'm too new a user to post links, but according to the tech data at wikidev, it identifies the 3200acm as 4x4:4. I know it really is 4x4:3 (if I'm wrong on this, let me know), but according to wikidev, the 3200acm not only has the Marvel 88W8964 (which is 4x4:3), but also has a Marvel 88W8887 (1x1:1) which is used as a DFS monitor. I didn't see any info on DFS chipsets/monitors on any of the other WRT AC/ACS series routers; so that's why I was assuming they didn't support DFS (or allow use of the 5ghz channels which require it). Please correct me where I'm wrong here.
According to the link to github that you had posted that explains difference between v1 and v2 of caimen and shelby, in the comments, @yuhhaurlin who had made the commit had said "For new device, it is embedded with power table and region code. There is no way for you to change it in order to comply with FCC rules. It also won't allow you to change region code."
That's why I was thinking not only the power tables, but even the region was locked down in the "new" (v2 of caimen and shelby) devices to the locale where the router was sold. That way, for instance someone living in the US, couldn't simply change the locale to a region where DFS isn't needed or where more channels or higher transmit levels are allowed.
For instance on my caimen v1, I can change the region, transmit power levels, and have access to all the 5GHz channels. Would someone with v2 (assuming they bought it in the US) be unable to do any of this (I know part of this answer goes back to one of my original questions if indeed the entire WRT AC/ACS/ACM family supports DFS or if only the 3200acm does)?
I know that's alot of questions, but I hope you can be patient with me and explain further.
Thanks very much for your time!
Linksys WRT1200AC V1
running LEDE snapshot branch (@davidc502's newest build)
upgraded with latest package versions from LEDE distro feeds