when you use the loop the number of post displayed is choosen fron the option set in Settings->Reading in you backend. It affects all the standard loops, not only the author page.
To change only for author page you have to use pre_get_posts hook and set the wanted number of posts using posts_per_page argument:
add_action('pre_get_posts','change_numberposts_for_author');
function change_numberposts_for_author( $query ) {
if ( ! is_admin() && $query->is_main_query() && is_author() ) {
$query->set('posts_per_page', 30); // 30 is the number of posts
}
}
See also is_author() on Codex
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