We really do need to standardize a convenient way to ask if the frequency
is in use.
QRL ? works okay, but is really disruptive if you are on the receiving end,
trying to copy a weak station.
This weekend, I tried using dit-dit . About 25% of the time, the occupying
station would send "dit", and I would move on. The rest of the time, it
would take a full blown QRL ? or CQ TEST to evoke a response.
I seemed to have more trouble squeezing other stations this weekend. If
I was using some very narrow, sharp filters, I could understand this.
However, I'm using a TS-940S with a pair of stock Kenwood 500 Hz filters.
If I can put up with your S9+20 signal 600 Hz away, why can't you deal
with my signal ?