[RTTY] Waterfall and CQ conundrum

[Ian White]

If you do have a waterfall display and you do check it carefully before
calling CQ, the only person who knows that is *yourself*. To anyone else
who might be listening, you are indistinguishable from that other kind
of operator who just appears on a frequency without checking at all.

So even though I do have a waterfall and I do check it carefully, I will
never skip sending "QRL?" 

73 from Ian GM3SEK