Everyone, please welcome @g0lfp
You can find more people in the instance in the directory
(you can opt into this too once you have 10 "friends", and add tags to your profile) and the local timeline.
And this list of radio amateurs on mastodon, may be of interest: https://pad.dc7ia.eu/p/radio_amateurs_on_the_fediverse
And there are apps!