Hi Fernando!
You can use the Telinga with the Twin Science mic - without the dish. Note
that the omni is pointing out of the dish, that is - when you put it on a
tripod (without the dish) you get the best freq. response when the mic is
pointing straight up to the sky. (But it is of low importance how you put i=
t.)
In the lab, when you replay the recordings, you use only the channel where
the omni is, or, - before recording - you make a cable so that the
omni-channel will be recorded into both tracks of the recorder.
(free-field noload transmision factor [1 kHz] =3D 35 mVPa-1 +/- 2.5 dB)
Theese figures are not comparible with the ways I measure Telinga output,
but I guess (I have never used a ME66!) that the Telinga output is at least
twice that of any ME microphone.
Klas.
At 20:29 2002-05-03 -0500, you wrote:
>Hi recordist of the world:
>
>I am planning to do a short research on diversity, richness, abundance an=
d
>seasonality of migrants and resident birds in coffee plantations in the
>central region of Veracruz state, Mexico. By this kind of research most
>researcher have been used the fixed-radius point count method which is
>currently a widely used method for censusing birds in both the understorey
>and canopy of forest habitat. That method count all birds seen or heard
>within a distance of 25 m for a period of 10 or 15 minutes. As you know th=
e
>sound recording is frequently used in conjuntion with playback to attract
>birds to the observer so that they may be identified visually or to attrac=
t
>them to the vicinity of traps. Playback also are used occassionally as aur=
al
>sitimuli during point counts to increase the detectability of a given
>species or to suerve otherwise secretive or nocturnal species. However,
>fewer researcher have used sound recordings as a method of surveying avian
>communites. Recently, two researcher made a comparison of point count and
>sound recording as bird survey methods in Peru. For the sound recording th=
ey
>used a Marantz PMD 222 and a Sennheiser ME 66 mic capsule with a K-6 power
>supply covered by a foam windshield. They mention that ME 66 is very high
>sensitivity (free-field noload transmision factor [1 kHz] =3D 35 mVPa-1 +/=
-
>2.5 dB) such that even very quiet signals are recorded at a good level. Th=
ey
>placed the mic in a clamp attached to a handle that was hand-held by an
>assitant at an angle of 20=B0 above the horizontal and they change the
>orientation of the mic at regular intervals during the recording period.
>Any of you could explain me what does mean that information between
>parenthesis?. However, they concluded perhaps the most effective techniqu=
e
>four using sound recording to survey bird populations is to use an
>omni-directional microphone capsule, thus eliminating the need for changes
>in mic direction.
>Recordist, i have three types of mic which i think are omni-directionals:
>Sennheisser ME 20 (powering module K3-U), Telinga Digital Stereo and Telin=
ga
>Twin Science. I think to use a Marantz PMD tape recorder, although is
>possible use Walkman Minidisc or Marantz PMD 650 too. I think to do the
>recording early in the morning, maybe from 06:00 to 10:00 AM.
>I have the following questions?
>1) What will be the best mic for my purpose? Record during 10 min and afte=
r
>try to identificate all species present in that point count.
>2). The Telinga Mics must be used without dish?
>3) I think to place the mic on a tripod in the center of the point count,
>but what will be the best way to aimed the mic?. toward the canopy,,
>subcanopy or understorey? Vertical or horizontal?
>4) What will be the best height to place the mic from the ground?
>5). Is there any way to know which is the detection threshod for each of m=
y
>mic?
>6). Is there any way to know what sound will be inside a 25 m distance?
>7). Must i do stereo or mono recording?
>Thanks a lof for your help
>
>
>
>
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