Six seated men converse and one man fiddles with an interesting contraption.
Several men are gathered to learn about ham radios.
Just because the men are sat near each other doesn't mean they are gathered together. The interesting contraption being used by one man does not imply that it is a ham radio.
They assembled not only to talk about ham radios.
seated men converse and one man fiddles with an interesting contraption does not imply that they learn about ham radios.