Hiya Mike,
Thanks for your interest. I have been hanging back for a few days, not really wanting to dump all this stuff on the SOTA site. It’s mildly embarrassing.
The wall is as far as I can tell some king of natural volcanic feature. It was very high. Much higher than it looks in the photo and higher still from the side where the main path is. It was also uneven.
Here are another 2 pics:
Above: Looking up at the ‘wall’ from the PR 1.3 path
Above: Forcing my way up between the ‘wall’ and fire damaged bushes.
Your guess is as good as mine but I don’t think it was built. What we need is a geologist or volcanologist!
Thanks for the QSO’s and your help on the frequencies.
CUSN I hope,
73, John.