Good to know that this has been reported before.
As for it not affecting anything, well if I run 1.5kw on EME, the power spike is 1950 w.
Amazingly, the beko amp can handle that ok but it's pushing it. 
My T/R preamp relays probably don't like it either.
I am effectively cutting off the spike by delaying the start of JT65b transmission by 1500ms.
Fortunately, the transmit 1500ms delay does not seem to effect the decoding on the receiving end .
Having fun on EME just running a 1kw to keep things cool.
Regards & Thanks.
NX3B