In article , Biz WD=?ISO-8859-1?B?2A==?=HCO
writes:

One comment to Mikes Post - Many WW2 Comm RCVRS didn't have Phasing or XTAL
Filters - Radio OPs were trained and expected to copy CW perfectly even with
a bunch of signals blaring out of the headphones. Just par for the course
back then. Myself - I can copy 30 WPM CW with 5 other stations nearby.

You train your brain to focus on just one tone and filter everything else
out. That ol noodle is a remarkable filter. I often listen to a Halli S-38D
on the 40 meter CW band at night and that's what 6 or 8 kc wide??

ISTR that as a Novice, I could do some of that, and some of my fellow Novice
ops bragged about it too. Once they upgraded from a Heath AR-3 to SX-99, maybe
their skill got rusty :-)

Of course most of us can copy "air phone" at a crowded party, picking a
friend's converstaion out of equally loud voices in the room. Not that it's
easy, but it works.
73, Mike K.

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