>>47278
It depends on what you want to jam and how. Audio can easily be "jammed" by just sending noise.
Look up some of the shortwave oddities that popped up in cold war, datalinks are not that easy to jam.
If you look at DUGA-3, a radio radar, it works using sharp audio spikes. Even if you added noise near the receiver, it would not jam the whole thing, as the pecks, so to speak, would still be distinguishable from the noise.
It's not exactly a datalink, but the problems are similar, to jam the receiver you need to analyze the data format and then think about what would corrupt the data.
Look up some shortwave oddities from the cold war era, especially "Workshop", as that one is believed to have been a jammer. You can dig up recordings for these professional jammers on YouTube.
To summarize, you'll probably never need a jammer. However, building one yourself might be worthwhile just for the extreme amount of knowledge you acquire along the way. Just take care, as it's highly illegal to do so and jammers can be located easily with the right equipment, which your local government's radio department DEFINITELY has.