Standardized DVB-T2 RF specifications - DigitalEurope
Standardized DVB-T2 RF specifications - DigitalEurope
Standardized DVB-T2 RF specifications - DigitalEurope
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8- 5- Immunity to pattern L3<br />
This is a tuner linearity test with one digital <strong>DVB</strong>-T signal on the N+4 channel and another<br />
digital <strong>DVB</strong>-T signal on the N+2 channel in addition to the wanted <strong>DVB</strong>-<strong>T2</strong> signal on channel<br />
N. This type of test is becoming increasingly important in today’s crowded spectrum.<br />
The <strong>DVB</strong>-<strong>T2</strong> receiver should provide the PFP1 when the unwanted signals are at the highest<br />
allowed level (-25dBm at the tuner input) and the wanted signal is I/C dB lower, where I/C is<br />
given in Table 6.<br />
Table 6 – Immunity to Pattern L3 (I/C PFP1)<br />
Mode I/C [N+2 and N+4]<br />
5 – 32KN 256Q 3/5 1/32 PP4 8MHz 28<br />
6 – 32KN 256Q 3/5 1/8 PP2 7MHz 27<br />
7 – 32KE 256Q 2/3 1/128 PP7 8MHz 27<br />
8 – 32KE 256Q 2/3 1/16 PP4 8MHz 26<br />
9 – 32KE 256Q 3/4 1/32 PP6 8MHz 25<br />
9- IMMUNITY TO CO-CHANNEL INTE<strong>RF</strong>ERENCE<br />
9- 1- Immunity to co-channel interference from analogue TV signals<br />
The immunity for interference from co-channel analogue TV-signals is specified as the<br />
maximum ratio of the interference to wanted signal (I/C) for reception (PFP1). The wanted<br />
<strong>DVB</strong>-<strong>T2</strong> signal should be set to -50 dBm at the tuner input.<br />
Table 7 – Immunity to co-channel interference 7 from analogue signals (I/C PFP1)<br />
Mode PAL-I1 PAL B PAL G/D1 SECAM-L<br />
4 – 16KN 256Q 3/5 1/32 PP4 8MHz -5 -5 -6<br />
5 – 32KN 256Q 3/5 1/32 PP4 8MHz -5 -5 -6<br />
6 – 32KN 256Q 3/5 1/8 PP2 7MHz -6<br />
7 – 32KE 256Q 2/3 1/128 PP7 8MHz -6 -6 -7<br />
8 – 32KE 256Q 2/3 1/16 PP4 8MHz -7 -7 -8<br />
9 – 32KE 256Q 3/4 1/32 PP6 8MHz -8 -8 -9<br />
9- 2- Immunity to co-channel DAB interference<br />
The immunity for co-channel interference from a single 1.7MHz wide DAB signal in the<br />
centre of the wanted channel is specified as the maximum ratio of the interference to wanted<br />
signal (I/C) for reception (PFP1). Only two modes are specified to reduce testing. The<br />
wanted <strong>DVB</strong>-<strong>T2</strong> signal should be set to -50 dBm at the tuner input.<br />
7 Note that the CCI interference generator should have its frequency reference locked to the <strong>DVB</strong> -<br />
T/<strong>T2</strong> signal generator in order to obtain repeatable measurement results.<br />
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