Yes, I use JSGME. I have several mods, but to troubleshoot I disabled all of them except for "GUI - Adjustable Frequency Presets for Flyable Helicopters (Master)", which I re-enabled just to be sure nothing was overwritten. Without enabling the "Ka-50 - Adjustable Frequency Presets (Module)" mod, I was able to change the radio frequencies of the Ka-50 when set to Client, but the same was not true for either the UH-1H or the Mi-8MTV2.
To reiterate, I disabled all my mods in JSGME, then enable "GUI - Adjustable Frequency Presets for Flyable Helicopters (Master)" and nothing else.