I have an LNA up the mast which handle can both 12v and 5v, selected by a jumper setting. Currently it is receiving 12v. The question is: What is the benefit, if any, to setting voltage to 12v over 5v, or is there no real benefit? The length of the LMR240 between the LNA and the bias-tee is 15-ish meters. Is the purpose of the settings to bridge longer cabling? May I expect to use 5v without loss of AC and message rate?
The reason it matters is that most LNA use 5v. It easier to just change that LNA rather than also change the bias-tee voltage (which is hard to get to though not impossible).