Broadcast Television
edit
The band is subdivided into seven channels for television broadcasting, each occupying 6?MHz.
[1]
| Channel
|
Frequency Range
|
| 7
|
174-180?MHz
|
| 8
|
180-186?MHz
|
| 9
|
186-192?MHz
|
| 10
|
192-198?MHz
|
| 11
|
198-204?MHz
|
| 12
|
204-210?MHz
|
| 13
|
210-216?MHz
|
European Band III allocations vary from country to country, with channel widths of 7 or 8?MHz.
The standard channel allocations for European countries that use
System B
with 7?MHz channel spacing are as follows:
| Channel
|
Frequency Range
|
| E5
|
174-181?MHz
|
| E6
|
181-188?MHz
|
| E7
|
188-195?MHz
|
| E8
|
195-202?MHz
|
| E9
|
202-209?MHz
|
| E10
|
209-216?MHz
|
| E11
|
216-223?MHz
|
| E12
|
223-230?MHz
|
The
Irish
(8?MHz) system is shown below.
| Channel
|
Frequency Range
|
| D
|
174-182?MHz
|
| E
|
182-190?MHz
|
| F
|
190-198?MHz
|
| G
|
198-206?MHz
|
| H
|
206-214?MHz
|
| i
|
214-222?MHz
|
| J
|
222-230?MHz
|
Australia
has allocated 8 channels in Band III for digital television, each with 7 MHz bandwidth.
| Channel
|
Frequency Range
|
| 6
|
174-181?MHz
|
| 7
|
181-188?MHz
|
| 8
|
188-195?MHz
|
| 9
|
195-202?MHz
|
| 9A
|
202-209?MHz
|
| 10
|
209-216?MHz
|
| 11
|
216-223?MHz
|
| 12
|
223-230?MHz
|
Russian analog television is transmitted using
System D
with 8 MHz channel bandwidth.
| Channel
|
Frequency Range
|
| 6
|
174-182?MHz
|
| 7
|
182-190?MHz
|
| 8
|
190-198?MHz
|
| 9
|
198-206?MHz
|
| 10
|
206-214?MHz
|
| 11
|
214-222?MHz
|
| 12
|
222-230?MHz
|
The band came into use for radio broadcasting at the turn of the 21st century and is used for
Digital Audio Broadcasting
.
It is subdivided into a number of frequency blocks:
| Block
|
Centre Frequency
|
| 5A
|
174.928?MHz
|
| 5B
|
176.640?MHz
|
| 5C
|
178.352?MHz
|
| 5D
|
180.064?MHz
|
| 6A
|
181.936?MHz
|
| 6B
|
183.648?MHz
|
| 6C
|
185.360?MHz
|
| 6D
|
187.072?MHz
|
| 7A
|
188.928?MHz
|
| 7B
|
190.640?MHz
|
| 7C
|
192.352?MHz
|
| 7D
|
194.064?MHz
|
| 8A
|
195.936?MHz
|
| 8B
|
197.648?MHz
|
| 8C
|
199.360?MHz
|
| 8D
|
201.072?MHz
|
| 9A
|
202.928?MHz
|
| 9B
|
204.640?MHz
|
| 9C
|
206.352?MHz
|
| 9D
|
208.064?MHz
|
| 10A
|
209.936?MHz
|
| 10B
|
211.648?MHz
|
| 10C
|
213.360?MHz
|
| 10D
|
215.072?MHz
|
| 10N
|
210.096?MHz
|
| 11A
|
216.928?MHz
|
| 11B
|
218.640?MHz
|
| 11C
|
220.352?MHz
|
| 11D
|
222.064?MHz
|
| 11N
|
217.088?MHz
|
| 12A
|
223.936?MHz
|
| 12B
|
225.648?MHz
|
| 12C
|
227.360?MHz
|
| 12D
|
229.072?MHz
|
| 12N
|
224.096?MHz
|
| 13A
|
230.784?MHz
|
| 13B
|
232.496?MHz
|
| 13C
|
234.208?MHz
|
| 13D
|
235.776?MHz
|
| 13E
|
237.488?MHz
|
| 13F
|
239.200?MHz
|
In the UK and part of Ireland, Band III was originally used for
monochrome
405-line
television
; however, this was discontinued by the mid-1980s. Other European countries (including Ireland) continued to use Band III for analogue
625-line
colour television.
Digital television in the
DVB-T
standard can be used in conjunction with VHF Band III and is used as such in some places. The use of sub-band 2 and sub-band 3 band for
Digital Audio Broadcasting
is now being widely adopted. Sub-band 1 is used for MPT-1327 trunked PMR radio, remote wireless microphones and PMSE links.
In North America, use of the band for television broadcasts is still widespread. Favorable propagation characteristics and reasonable power limits (up to 65?
kW
for
full-power
digital television
, versus 20?kW or less on
VHF
Band I
) has meant that many US broadcasters elected to move their full-power
ATSC
stations from
UHF
frequencies to Band III
VHF
when all full-power
NTSC
analog television
services in the US shut down in 2009.
[2]