Outdoor Microphone System - Page 9
G.R.A.S. Sound & Vibration
Fig. 2.2 Left to right; tripod and pole adapters
2.1 Windscreen
This comprises a windscreen and a windscreen holder (see Fig. 2.3).
The windscreen itself is made of polyurethane foam. It reduces wind-noise to a minimum and
gives maximum rain protection. It also allows for 0 ° (Type 41AM) and 90 ° (Type 41CN) refer
-
ence directions of incidence.
The windscreen holder has four anti-bird spikes to prevent birds from perching on top of the
windscreen. The centre spike prevents smaller birds from perching between the other three
spikes.
Fig. 2.3 Windscreen of the Outdoor Microphone System
2.2
Microphone Assembly
On delivery, the microphone assembly is protected by a transport tube, see Fig. 2.4. A small
hole of 0.5 mm diameter at the top end of the transport tube ensures pressure equalization
during transport. The transport tube is also used when testing for self-noise. In this case, the
hole must be sealed using a piece of tape. Remember to remove the tape after use.
When screwing the windscreen onto the microphone, apply some silicone grease (supplied) to
the thread - see Fig. 2.4). The silicone grease is waterproof and protects against rust.
Anti-birds spikes
Windscreen
Windscreen holder
