Options to Modify SARPs Regarding VDL Mode 4 Operations
Either Above or Below 112 MHz
OPTION 1: Modify Annex 10, Volume 3, Paragraph 126.96.36.199.2 defining
recommendation on tuning range. In combination with the unmodified
188.8.131.52, this option looks forward to operation in the band 112-137
MHz and does not consider tuning below 112 MHz.
184.108.40.206.2 Recommendation.—A VDL Mode 4 transmitter/receiver should be
capable of tuning to any of the 25 kHz channels from 108 112 MHz to
OPTION 2: Modify Annex 10, Volume 3, Paragraph 220.127.116.11 defining
specified error rate. In combination with the unmodified 18.104.22.168.2,
this option recommends tuning down to 108 MHz but only recommends
nominal performance down to 112 MHz.
22.214.171.124 Specified error rate. The specified error rate for Mode 2
operation shall be the maximum corrected Bit Error Rate (BER) of 1 in
104. The specified error rate for Mode 3 operation shall be the
maximum uncorrected BER of 1 in 103. The specified error rate for Mode
4 operation shall be the maximum uncorrected BER of 1 in 104 on any
assignable channel in the band 118 – 137 MHz.
126.96.36.199.1. Recommendation.—A VDL Mode 4 receiver should achieve the
specified error rate of 1 in 104 on any assignable channel in the band
112 – 117.975 MHz.
OPTION 3: Modify Annex 10, Volume 3, para. 6.1.2, to include
time-phased introduction of services in the band 108-117.975 MHz.
Append the following new text:
188.8.131.52 Utilization of the band 108-117.975 MHz. Channels in the band
112-117.975 MHz may be assigned immediately, subject to agreed
spectrum planning criteria, following enabling changes in the Radio
Regulations. Channels in the band 108-111.975 MHz may be assigned on
the basis of a regional agreement, subject to agreed spectrum planning
criteria, following a date prescribed by the Council giving a period
of two years or more following approval of the regional agreement