RF:
What bandwidths does Spectera support?
- Spectera utilizes 6MHz or 8MHz depending on the region of operation.
How many frequency variants do you plan?
- SEKs and Antennas (DAD) are available in two variants. One for the TV-UHF range and for the 1.4/1.5 GHz range. The Base Station can be used for both ranges, since it has no RF components. If we see the need for additional frequency ranges, we will consider this for further releases.
Sennheiser's WMAS system occupies an entire TV Channel. Isn't that a waste of resources?
- It is by definition a multichannel system, if used in a unidirectional 4 channel application, that would not be the most efficient approach. However, for a more channels or bi-directional use cases it requires less spectrum and IEM and MIC can be deployed into the same TV Channel. Please refer to the “Technical Paper Why Broadband” for more details.
What is the RF transmit power?
- The RF transmit power is up to 100mW EIRP, but dependent on national regulations. It can be reduced to increase reuse of spectral resources in controlled environments.
- Please note that due to the TDMA nature of the system, the power is only emitted by one device at a time.
- Additionally, it is spread over an entire broadband channel. Consequently, Sennheiser's WMAS system has much lower power spectral density compared to the same number of narrowband devices where RF power adds up with each transmitter.
Do you consider operation in the 800 MHz duplex gap?
- Currently not, the bandwidth available in the duplex gaps makes a deployment of WMAS at least questionable.
Do you consider operation in the 700 MHz duplex gap?
- The 700 MHz duplex gap is not harmonized for use by wireless microphones. So, depending on the country other applications are using it.
What happens, if a RF channel must be changed?
- Changing an RF channel takes less than 10 seconds until the system is good to go again. For future releases automated hopping might be considered.
What are 4 antenna ports good for?
- Additional antennas can be used for range extension, redundancy or a second frequency channel.
How many antennas should I use?
- This strongly depends on your RF environment.
- What is the area you want to cover?
- How much interference is to be expected?
- What we have seen from our tests with the new broadband technology is that especially in reflective indoor scenarios, one antenna can be sufficient. However, in outdoor environments or scenarios with lots of body absorption, two or more antennas will be beneficial to increase the reliability of the RF link.
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