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[Davy1]

Some constructional details of the new ultrasonic Pinger on the AMS Forum. This is much more directional making sub location easier.

http://www.theassociationofmodelsubmariners.com/t1644-pinger-2-ultrasonic#10016

Over the years, I've been puzzled that more sub enthusiasts don't use them. Cheap compared with the loss of a sub and enables you to safely sail in water that isn't  "gin-clear." (i.e most ponds)

David

PS Also notes on a small development setback for openLRS in my sub!

[Davy1]

Someone asked me the ultrasonic frequency used - 40KHz , as it happens, and I've added this and some more detail to the original article.

David