-my $dxchan = DXChannel->get($call);
-return (1, $self->msg('e10', $call)) unless $dxchan;
-return (1, $self->msg('e13', $call)) unless $dxchan->is_ak1a();
+my $ref = DXCluster->get_exact($call);
+my $dxchan = $ref->dxchan if $ref;
+return (1, $self->msg('e10', $call)) unless $ref;
+return (1, $self->msg('e13', $call)) unless $ref->isa('DXNode');