[mythtv-users] DVB-T Hell in Sydney

[John Pilkington]

On 22/06/16 01:27, Doug Scoular (dscoular) wrote:
> Hi All,
>
> On 20/06/2016, 14:28:20 +0000, Mark Perkins wrote:
>>
>>
>>>> Newcastle transmitter but I had thought the distance would be
>>>> too great (87.3km vs 18.6km).
>>>>
>>
>>> Sorry if this is no help. I haven't been following this thread but offer
>>> this link in case it helps.
>>
>>> https://ozdigitaltv.com/transmitters/NSW
>>
>>
>> Of note - Bouddi is 1.27kw and Newcastle is 250kw.
>>
>
> 	That's interesting, I further note that Seven and Nine are repeated on
> less power and they seem more problematic for my location:
>
> Bouddi Transmitter:
> SBS	SBS40	613.500 Mhz	1.27 kW	Directional	Vertical
> ABC	ABC41	620.500 Mhz	1.27 kW	Directional	Vertical
> Seven	ATN42	627.500 Mhz	1.27 kW	Directional	Vertical
> Nine	TCN43	634.500 Mhz	1.27 kW	Directional	Vertical
> Ten	TEN44	641.500 Mhz	1.27 kW	Directional	Vertical
> Seven	NEN46	655.500 Mhz	650.00 W	Directional	Vertical
> Nine	NBN47	662.500 Mhz	650.00 W	Directional	Vertical
>
>
> 	I have scanned frequencies which don't match the Bouddi table, above, but
> are more in-line with the ones coming from Newcastle (there seem to be
> more transmitters in the area but this is the one the
> https://myswitch.digitalready.gov.au/ shows as my alternative):
>
> Newcastle, Mt. Sugarloaf:
> Newcastle Digital TV Channels at Mt Sugarloaf
> Seven	NEN35	578.500 Mhz	250.00 kW	Omnidirectional	Horizontal
> Nine	NBN36	585.500 Mhz	250.00 kW	Omnidirectional	Horizontal
> ABC	ABC37	592.500 Mhz	250.00 kW	Omnidirectional	Horizontal
> SBS	SBS38	599.500 Mhz	250.00 kW	Omnidirectional	Horizontal
> Ten	NRN39	606.500 Mhz	250.00 kW	Omnidirectional	Horizontal
>
>
> 	So I guess I have two burning questions:
>
> 	1. How do I identify the transmitter, is there some way to determine it
> from the network id or other data in the stream?
> 	2. Why are all my scanned channels shown as having vertical polarisation
> when the suspected channels from Newcastle (Australia) transmitters should
> have horizontal polarisation? I fear my antenna is horizontal - so maybe
> this weekend I'll try re-orienting the antenna to vertical to match the
> Bouddi transmitter and MythTV table.

If your antenna has horizontal elements it's likely it was set up for 
Newcastle.  The polarisation entry in the DB is a default value, and 
irrelevant.  The frequencies in your DB identify the mux and the 
transmitter.  I would try using the Transport Editor to delete all the 
Bouddi muxes.  If results are bad, rotate (and re-point?) the antenna 
and delete the Newcastle muxes instead.