I just pulled this up on the Global Tuners (Majave Desert receiver) and heard a pretty distinct "L" despite a weak signal.
In the past when sigs were good, I heard a key-up error or some anamoly, like a half-dit before the first real "dit". I don't tend to hear it when the sig is weak. Of course, maybe it's just my ears or imagination.
Time 1600Z. 6668 KHz.