Missing Muxes after Australia Free TV Frequency Change

Lee Lee

Hi,

First of all i'd like to thanks for producing such a great product!

In Australia the digital TV Networks have been Moving broadcast frequencies, which has required a rescan to continue receiving the channel, my issue is that TVHeadend no longer recieves some of the changed stations

see attached screenshot
regards
Lee

ProfYaffle

I'd try to find an authoritative source for your local frequencies - including config (QAM64 et al) - and check what you've got. Chances are high that the channels have simply moved onto a different frequency (mux) and/or the broadcaster has changed the mux config so they can squeeze more channels in.

If you have idle scanning enabled then I'd expect tvheadend to find the new muxes eventually, but giving it some help by telling it where to look would be useful.

I did have a quick squint on the interwebs and couldn't immediately find anything for Newcastle. It's ultimately dependent on the specific transmitter you're using.

EDIT

This is the best I could find: http://sichbopvr.com/frequency-tables. If they've recently retuned, though, the data might be out of date.

One option I've used before is to use a real TV and see what that thinks the mux details are. Even if it's just the carrier frequency, that's frequently enough to get you going.

I did check the linuxtv data, but that hasn't been updated yet if you have had a recent change: http://git.linuxtv.org/cgit.cgi/dtv-scan-tables.git/tree/dvb-t/au-Newcastle

Lee Lee

Thnks Prof Yaffle,

ive installed VDR and done a scan through the channels and VDR picks up all the channels. Interestingly I've done a reinstall of TVH on a new linux installation and it does find the missing channels. I'll look at the VDR config and see if i can find the updated frequencies from its config.

will post back shortly

Lee Lee

Thanks Prof Yaffle

just manually added a mux with the frequencies for the missing stations and all is working!

thanks for your help!

Lee

ProfYaffle

Good-oh.

Any idea what the change was? Frequency, config, or simply that the wind was blowing the wrong way and something got confused?

Lee Lee

on the TV Stations side? yes the govening body is forcing the tv stations to shuffe frequencies, to free up a block of UHF spectrum that they have sold for use with 4G / LTE / wimax services. so it should

this link shows it at a high level: http://www.acma.gov.au/webwr/radcomm/frequency_planning/spectrum_plan/arsp-wc.pdf

for example Prime has moved from 704.500 Mhz to 578.500 Mhz

ProfYaffle

Okay, so it is a frequency change - that explains why 704.5 went dark, at least, and there's an explanation for anyone else googling "where've Prime and SCA gone in NSW" :)

If you're feeling really public-spirited, you could try to update the linuxtv frequencies so they ripple through to everything else that uses them as a reference (e.g. that's where theadend gets its 'add muxes by location' information from). I've no idea if that's trivial or traumatic, though...

-- J876 --

For further reference to TV mux frequencies in Australia, have a look at the ACMA TV and Radio Handbook:

http://www.acma.gov.au/Industry/Broadcast/Spectrum-for-broadcasting/Radio-and-television-transmitters/radio-tv-broadcasting-stations-book-spectrum-for-broadcasters-acma

If the frequencies change again, this official document has all the TV and Radio frequencies for every location in Australia.

I put the link to the page instead of the document, just in case it changes again.

The ACMA is the Australian Telecommunications and Media Authority

Hope this helps everyone in Australia using TVHeadend.