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WiDIF-HP Precautions
Lavalier microphone
Detection
Mobile phone signals
2.4G Wifi
RFI (Radio Frequency Interference) Noise
WiDIF-HP performs cyclic packet transmissions similarly to mobile phones, computers, and other digital
transmission equipment.
The nonlinear devices (FETs, etc.) in the condenser microphone pick up these other RF signals, and RFI noise
may occur according to the packet format as a result. Countermeasures are therefore required. This applies in
particular to DWX transmitters set to high output (50 mW).
The RF signals emitted by
WiDIF-HP may affect the lavalier
microphone.
RFI noise may also occur due to RF signals emitted by mobile
phones, computers, and other digital equipment.
Noise countermeasures
Use cables with effective shielding.
Take measures to implement RF immunity of microphone unit.
Use lavalier microphones designed to be used together with digital wireless equipment that include RFI noise
countermeasures.
Notes
Dynamic microphones are typically not subject to exhibiting this type of RFI noise.
Sony professional lavalier and shotgun microphones with a suffix /9X in the model name, such as the
ECM-77BC/9X, are certified by Sony to be suitable for use with the DWX digital wireless system. Other Sony
professional microphones without a /9X in the model name may not be suitable for use with the DWX
system.
Microphones from Sanken, DPA, or Countryman include models that do not produce RFI noise and can
therefore be used with the DWX system. For details on compatible models, contact the manufacturer of
each microphone.
WiDIF-HP Precautions
This section provides information about various points to keep in mind when operating a digital wireless system.
For details, see “UHF System Configuration” (page 38).
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