Unable to use DVB-T from translator

[marcusbrutus]

Rather than using the main transmitter in Hobart (.tas.au) [VHF], I've had to use the Hobart NE Suburbs translator (Government Hills) [high-band UHF]. Scanning is successful (even with a custom channels.conf), however mythtv associates channels with the VHF multiplex frequencies (as published in the TS?), rather than the translated UHF ones (what the card is tuned to) ... resulting in no tunable channels at all. My only work-around at the moment is to change the channel/mux information in the database.

[marcusbrutus]

for example: Tuner tuned to "Southern Cross Television" on the translator:

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# grep SCTV channels.conf SCTV Hobart:767500000:INVERSION_AUTO:BANDWIDTH_7_MHZ:FEC_3_4:FEC_3_4:QAM_64:TRANSMISSION_MODE_8K:GUARD_INTERVAL_1_8:HIERARCHY_NONE:625:626:2306 SCTV - HD:767500000:INVERSION_AUTO:BANDWIDTH_7_MHZ:FEC_3_4:FEC_3_4:QAM_64:TRANSMISSION_MODE_8K:GUARD_INTERVAL_1_8:HIERARCHY_NONE:3611:0:2338 SCTV:767500000:INVERSION_AUTO:BANDWIDTH_7_MHZ:FEC_3_4:FEC_3_4:QAM_64:TRANSMISSION_MODE_8K:GUARD_INTERVAL_1_8:HIERARCHY_NONE:625:626:2370

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# tzap -c channels.conf "SCTV" using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0' tuning to 767500000 Hz video pid 0x0271, audio pid 0x0272 ...[snip]

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# dvbsnoop -n 1 -nph 0x10 | grep -i Cent[eE][Rr]

Center frequency: 0x01443fd0 (= 212500.000 kHz)

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# dvbsnoop -n 1 -nph 0x10 | grep -i Cent[eE][Rr]

Center frequency: 0x01443fd0 (= 212500.000 kHz)

mythtuner:~# dvbsnoop -n 1 -nph 0x10 dvbsnoop V1.4.50 -- ​http://dvbsnoop.sourceforge.net/

---

SECT-Packet: 00000001 PID: 16 (0x0010), Length: 84 (0x0054) Time received: Thu 2008-10-16 23:54:46.946

---

PID: 16 (0x0010) [= assigned for: DVB Network Information Table (NIT), Stuffing Table (ST)]

Guess table from table id... NIT-decoding.... Table_ID: 64 (0x40) [= Network Information Table (NIT) - actual network] section_syntax_indicator: 1 (0x01) reserved_1: 1 (0x01) reserved_2: 3 (0x03) Section_length: 81 (0x0051) Network_ID: 12938 (0x328a) [= --> please lookup at ​http://www.dvb.org] reserved_3: 3 (0x03) Version_number: 7 (0x07) current_next_indicator: 1 (0x01) [= valid now] Section_number: 0 (0x00) Last_Section_number: 0 (0x00) reserved_4: 15 (0x0f) Network_descriptor_length: 27 (0x001b)

DVB-DescriptorTag: 64 (0x40) [= network_name_descriptor] descriptor_length: 25 (0x19) Network_name: "Southern Cross Television" -- Charset: Latin alphabet

reserved_5: 15 (0x0f) Transport_stream_loop_length: 41 (0x0029)

Transport_stream_ID: 2306 (0x0902) Original_network_ID: 12811 (0x320b) [= >>ERROR: not (yet) defined... Report!<<] reserved_1: 15 (0x0f) Transport_descriptor_length: 35 (0x0023)

DVB-DescriptorTag: 65 (0x41) [= service_list_descriptor] descriptor_length: 6 (0x06)

service_ID: 2306 (0x0902)[ --> refers to PMT program_number] service_type: 1 (0x01) [= digital television service]

service_ID: 2338 (0x0922)[ --> refers to PMT program_number] service_type: 1 (0x01) [= digital television service]

DVB-DescriptorTag: 90 (0x5a) [= terrestrial_delivery_system_descriptor] descriptor_length: 11 (0x0b) Center frequency: 0x01443fd0 (= 212500.000 kHz) Bandwidth: 1 (0x01) [= 7 MHz] priority: 1 (0x01) [= HP (high priority) or Non-hierarch.] Time_Slicing_indicator: 1 (0x01) [= Time Slicing is not used.)] MPE-FEC_indicator: 1 (0x01) [= MPE-FEC is not used.)] reserved_1: 3 (0x03) Constellation: 2 (0x02) [= 64-QAM] Hierarchy information: 0 (0x00) [= non-hierarchical (native interleaver)] Code_rate_HP_stream: 2 (0x02) [= 3/4] Code_rate_LP_stream: 0 (0x00) [= 1/2] Guard_interval: 1 (0x01) [= 1/16] Transmission_mode: 1 (0x01) [= 8k mode] Other_frequency_flag: 1 (0x01) reserved_2: 4294967295 (0xffffffff)

DVB-DescriptorTag: 131 (0x83) [= User defined/ATSC reserved] descriptor_length: 12 (0x0c) Descriptor-data:

0000: 09 02 fc 06 09 22 fc 3c 09 42 fc 42 .....".<.B.B

CRC: 4292949646 (0xffe1368e) ==========================================================

[danielk]

Trunk uses a new channel scanner, not fixing 0.21-fixes channel scanning problem anymore.

[Stuart Auchterlonie]

These channels should be checked against the new channel scanner to verify we can handle this situation.

Stuart