Re: LF: Way off subject ... and totally batty

["M. J. Powell" <mike@pickmere.demon.co.uk>]

In message <002b01c3109e$081b7440$3704210a@Hugh>, Hugh M0WYE 
<m0wye@thersgb.net> writes
> Hi group,
> Has anyone else tried this with their LF/VLF receivers ?
>
> I have put a microphone on my SLM and have been receiving bats. I used a
> tiny electret condenser mic capsule on the input of the D2006, with the
> usual 1.5V cell and blocking cap to power the capsule. I was able to pick up
> bat sounds up to 55kHz. There were some clicks down at 22.5kHz, and some
> twitters around 45kHz. I think they are just the common or garden
> Pipistrelle bats.
>
> The bats are attracted to our big halogen security lamp, because of the
> insects that fly round it.
>
> I haven't fed the signals into Argo yet ...
Apparently they use an increased PRF as they home in to their prey.

Mike
--
M.J.Powell