ARRL

ARRL General Bulletin ARLB007 (2013)

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ARLB007 FCC Grants ARRL's Request for Temporary Waiver for TDMA
Systems

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ARRL Bulletin 7  ARLB007
From ARRL Headquarters  
Newington CT  March 26, 2013
To all radio amateurs 

SB QST ARL ARLB007
ARLB007 FCC Grants ARRL's Request for Temporary Waiver for TDMA
Systems

Acting upon a subsequent request by the ARRL, the FCC issued an
Order (WT Docket No, 12-283) on March 25, granting a temporary
waiver to transmit communications on amateur service channels above
30 MHz using single time-slot Time Division Multiple Access (TDMA)
systems. The temporary waiver was granted pending the resolution of
a related rulemaking proceeding (RM-11625).  The waiver can be found
in PDF format at,
http://transition.fcc.gov/Daily_Releases/Daily_Business/2013/db0325/DA-13-542A1.pdf.

Currently, amateur stations currently are authorized to transmit
messages using telephony and data emissions. The ARRL noted in its
request that Amateur Radio Service licensees have recently
established numerous narrowband repeater facilities using multiple
time-slot TDMA repeaters and single-slot TDMA handheld digital
transceivers in the 70 centimeter (420-450 MHz) band, but Part 97 as
it currently stands does not permit amateur stations to transmit
single-slot TDMA emissions on Amateur Radio Service channels above
30 MHz.

The FCC stated in its Order that the purpose of specifying emission
designators for the Amateur Radio Service "is to relegate the
transmission of certain inharmonious emission types to different
segments of the frequency bands, while still allowing great
flexibility in the types of emissions that may be transmitted by
amateur stations." In granting the temporary waiver, the FCC agreed
with the ARRL, noting that the digital systems that radio amateurs
have recently implemented are "compatible with existing amateur
repeater channelization plans."

The FCC also noted that allowing FXE and F7E as phone emissions and
emission type FXD as a data emission "is unlikely to result in
inharmonious emission types being used in the same segments of the
frequency bands. We also conclude that allowing amateur stations to
transmit these emission types is consistent with the basis and
purpose of the amateur service, specifically to continue to
contribute to the advancement of the radio art. We conclude that
good cause has been shown for temporary waiver of Section 97.3(c)(5)
to allow amateur stations to transmit emission types FXE and F7E as
a phone emission and Section 97.307(f)(8) to allow amateur stations
to transmit emission type FXD as a data emission. We therefore waive
these rules accordingly, conditioned on the outcome of the pending
rulemaking proceeding."
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