To me the important point that I tried to make in my posting, which has
drawn no comment, is the one I made about getting people to write up their
experimental work for publication, and specifically that concerning 500kHz.
To maintain progress on gaining a long-term allocation around 500kHz we will
need to raise the profile nationally and internationally of work undertaken
on 500kHz. One way of doing this is to get a few good technical articles
written, not just sharing knowledge but encouraging others and providing
suitable designs to enable them to join in; good construction articles can
do just that.
73 John, G3WKL