Sennheiser Press Release Re: Wireless Mic Frequency Concerns


October  21, 2008

Spectrum Reallocation & White Space

An Explanation  and Current Developments

Many questions have surfaced in recent weeks  over the actions of the Federal
Communications Commission (FCC) regarding  digital television, spectrum
re-allocation, and wireless microphone technology.  These actions have an impact on
the current professional wireless microphones.  The following information is
published in order to reduce misunderstanding about  these issues.

How is the TV spectrum being reallocated?

The  U.S. is in transition from conventional analog TV to digital TV. This is
scheduled to be completed on February 17, 2009. At this same time, the
reassignment of TV channels 52-69 (698 ­ 806 MHz) will be completed. This
band will partially be used for emergency communications in channels 63, 64, 68,
and 69. The rights to use the majority of the remaining channels were
auctioned  to AT&T, Verizon, and Qualcomm to provide what is being termed as advanced
wireless services (AWS). This raised billions of dollars for the federal
government and was therefore called the digital dividend. This will affect
wireless microphones operating between 698-806 MHz (generically called the 700
MHz band), such as our evolution wireless C range systems.

Is this  the White Space issue I’ve been hearing about?

No. The White Space debate  is separate and distinct from the digital

Will my C range  evolution wireless system operate after February 2009?

Technically  systems will still work. However, wireless mics will be
prohibited to operate  between 698 ­ 806 MHz in the near future. This restriction
could go into  effect as early as February 17, 2009. It is likely the FCC will
make an  announcement after their meeting scheduled on November 4th, 2008.

What is the White Space debate?

The FCC is considering to  allow a new class of unlicensed consumer
electronic products, known as white  space devices (WSD), to operate in locally unused
UHF TV channels 21-51. If  enacted, these new devices would also affect
wireless mic users.

The  debate centers on how current licensed devices (wireless mics are
considered to  be licensed devices by the FCC) will be protected from these new
unlicensed  white space devices (WSD). The FCC has acknowledged the need to
prevent  interference from white space devices to digital television signals and
wireless  microphones. The FCC recently conducted tests on WSD prototypes and
published a  report in mid October. A link to this report is referenced below.
Once again, we  expect further FCC action after their meeting on November 4th.

What  has Sennheiser been doing regarding the White Space debate?

Sennheiser  has been directly communicating with the FCC and legislators
making them aware  that the term “white space” is a misnomer since broadcasters,
film producers,  and professional entertainers have been using licensed
devices, such as wireless  microphones and monitoring systems, in this spectrum for
years. Therefore major  news, political, sports and entertainment events would
not be able to operate  reliably if the spectrum was randomly flooded by new
unlicensed devices. To  demonstrate this point,

Sennheiser participated in the FCC field tests of  WSD prototypes. Sennheiser
has also been deeply involved in helping to shape  response to the FCC
through the Professional Audio Manufacturers Association,  the Sports Video Group,
and the Microphone Interests Coalition.

What  about the future?

It is certain that the amount of spectrum available for  wireless microphone
use is shrinking. The 700MHz range will no longer be  available for use for
wireless mics. The remaining usable UHF spectrum may  become smaller, or it may
be shared with new devices. No matter what happens,  Sennheiser will continue
to support wireless microphone use with the most  flexible products and
service available.  Sennheiser is continually  developing unique ways to face new
challenges with the same reliability that has  always characterized our products.

Explanation of Recent FCC  Activity

There have been two recent communications from the FCC that have  caused
heightened anxiety:

Notice of Proposed Rule Making banning  wireless mics from the 700 MHz band

This NPRM can be read in its entirety  at:

Sennheiser  had predicted this action. That’s why we advised our customers
back in early  2007 that the FCC was likely to impose restrictions on operating
wireless mics  between 698 MHz and 806 MHz. We therefore eliminated systems
operating in this  range from our regular assortment and made them available
only based on a  special order.

Sennheiser submitted a detailed response to this proposal  on Oct 3rd and
again on Monday, Oct. 20th. We are lobbying hard for a measured  migration out of
the 700 MHz band that includes a grace period that would allow  existing
users to continue to operate in this band on a non-interference basis.  The full
comment to the FCC is posted on the following webpage:

The White Space Technical  Report

The FCC executive summary can be found  at:

This  report relates to spectrum sensing capabilities of proposed white space
devices  (WSD). Other than the FCC stating that “…we believe… the ‘proof
of concept’  has been met,” there is nothing new in this report.

1) WSD devices would  still be required to detect and avoid wireless mics
2) Fixed WSD are being  considered ahead of the more problematic portable
3) More development  is required on WSDs to meet the performance standards
that have been  set

Furthermore, there is also a proposal being considered that would  dedicate
at least two TV channels in every market for wireless microphone use.  Major
events, such as sports, would have additional channels  reserved.

The bottom line is this: wireless mics will continue to be used  throughout
our nation. The FCC has scheduled a discussion and may vote on these  issues on
November 4th. We will distribute the results of this vote as well as a
detailed analysis of what this means to wireless mic users. In the meantime,  feel
free to contact me with further questions. Thank you.

Joe  Ciaudelli
860-434-9190 Ext. 508


Sent on behalf of  Sennheiser.