The expression "Digimode (packet preferred)" means preferred areas
of activity for packet radio operations.
Where several modes are shown in the sub-bands the first has
priority. But this has to be exercised on a Non-Interference Basis
(NIB) according to the ITU Radio Regulations.
A mode written in brackets ( ) means "preferred area of activity".
R E M A R K S
The expression RTTY shall be replaced by the expression DIGIMODE.
The expression "digimode" includes all modes of this form of
transmission (RTTY, Packet Radio etc.).
The expression "phone" includes all modes of this form of
transmission. Up to 10 MHz LSB and above USB should be used on HF
bands.
1.8 MHz band.
Those societies which have an existing SSB allocation below 1840
kHz may continue to use it. However, they are requested to take all
necessary steps with their licensing Administrations to adjust the
phone allocations in accordance with the Region 1 Band Plan.
The band segment 1907.5 to 1912.5 kHz (Japanese DX window) should
be kept free for transmissions by Region 1 stations. Instead use
the split-frequency technique when operating here.
3.5 MHz band.
Intercontinental operation should be given priority in the 3500 -
3510 kHz and 3775 - 3800 kHz band segments.
Member Societies should approach their national telecommunications
authorities and ask them not to allocate frequencies to other than
amateur stations in the band segment that IARU has assigned to
intercontinental long distance (DX) traffic, i.e. 3500 - 3510 and
3775 - 3800 kHz.
Contest Preferred Segments.
Where no DX traffic is involved, the contest preferred segments
should not include 3500 - 3510 kHz or 3775 - 3800 kHz. Member
Societies will be permitted to set other (lower) limits for
national contests (within these limits). This recommendation does
not apply to digimode stations.
Contest activity shall not take place on the 10, 18 and 24 MHz
bands.
7 MHz band.
The use of Packet Radio is discouraged on 7 MHz band.
The band segment 7035 - 7045 kHz may be used for store-and-forward
traffic in the area of Africa south of the equator during local
daylight hours. However, the use of more efficient modes than the
AX.25 packet radio are encouraged.
10 MHz band.
The use of Packet Radio is discouraged on 10 MHz band.
It is recommended that unmanned stations using digital modes shall
avoid the use of the 10 MHz band.
SSB may be used during emergencies involving the immediate safety
of life and property and only by stations actually involved in the
handling of emergency traffic.
The band sgment 10.120 to 10.140 MHz may be used for SSB
transmissions in the area of Africa south of the equator during
local daylight hours.
News bulletins on any mode should not be transmitted on the 10 MHz
band.
14 MHz band.
The band segment 14.089 - 14.099 MHz should be used for
non-automatic digimode transmissions. The band segment 14.101 -
14.112 MHz should be used for store-and-forward traffic. However,
the use of more efficient modes than the AX.25 should be
encouraged.
SSTV/FAX:
The frequencies 14.230, 21.340 and 28.680 MHz should be used as
calling frequencies for SSTV and FAX operators. After having
established contact, they should move to another free frequency
within the telephony portion of the band.
Satellite operation frequencies:
Member Societies should advise FM (and other) operators not to
transmit on frequencies between 29.3 and 29.51 MHz in order to
avoid interference to amateur satellite downlink.
Unmanned transmitting stations:
IARU Member Societies are requested to limit this activity on the
HF bands. It is recommended that any unmanned transmitting station
on HF shall only be activated under operator control except for
IARU approved beacons or specially licensed experimental stations.
It is recommended to use more efficient modes than the AX.25 packet
radio.
Transmitting Frequencies:
The announced frequencies in the Band Plan are understood as
"transmitting frequencies" (not those of the suppressed carrier!).
Experimentation with NBFM Packet Radio on 29 MHz Band:
Preferred operating frequencies on each 10 kHz from 29210 to 29290
kHz incl. should be used. A deviation of +/- 2.5 kHz being used
with 2.5 kHz as maximum modulation frequency.
Footnotes:
Footnotes to the HF Band Plan should be avoided.
National Societies are requested to advise their members to follow
this Band Plan.
