Re: parabolic reflectors

To: "Birding Australia" <>, "Roger Coles" <>
Subject: Re: parabolic reflectors
From: "Bill Rankin" <>
Date: Wed, 4 Mar 1998 23:08:31 +1000
-----Original Message-----
From: Roger Coles <>
To:  <>
Date: Wednesday, March 04, 1998 10:48
Subject: parabolic reflectors

>Dear Bird Persons
>Does anyone use parabolic reflectors for recording bird sounds? If so, I am
>interested in the acoustical performance of these devices.
>In particular, I am trying to track down information on the 24" Grampian
>parabolic reflector. These reflectors were in use about 35 years ago I
>believe, and I am wondering anyone still has one perhaps, or if they know
>anything about its design/performance etc. Any information gratefully
>Thank you.
>Dr. Roger B Coles
>Vision, Touch & Hearing Research Centre
>Dept. of Physiology & Pharmacology
>The University of Queensland
>Brisbane, Queensland
>TEL: + 61 7 3365 2182
>FAX: + 61 7 3365 4522
If you want to record birds a parabolic reflector is an excellent way to
amplify a distant call (I have been using one for many years).
The "performance'' of a reflector is difficult to quantify as there are so
many variables in the field ie: microphone, tape recorder, the frequency
range of the target species, the weather and the terrain to name but a few.
There is a good chapter on parabolic reflectors in the book "Wildlife Sounds
and their Recording" by Eric Simms ( a BBC wildlife recorder) in which he
discusses the relative merits of the various types of reflectors.You could
also check out the web site for "Telinga" reflectors at     If you want to record human voice (at a
distance) then a shotgun microphone may be a better way to go  because of
the lower frequencies involved.

Bill Rankin
Editor: "AudioWings"
Newsletter of the Australian Wildlife Sound Recording Group

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