[mythtv-users] ATSC channel not detected with ATI TV Wonder 600

[John Pilkington]

On 03/01/2020 18:36, Will Dormann wrote:
> On 1/3/20 11:43 AM, John Pilkington wrote:
> 
>> https://nocable.org/browse-stations/callsign/wpxi-pittsburgh-pa
>>
>> WPXI is scheduled to start its repacking process on 4/13/2017 and finish
>> on 8/2/2019. After the repack, the RF channel (not digital) will change
>> from 48 to 23. This means that to continue to view WPXI, you will need
>> to rescan your TV after that scheduled completion date.
> 
> 
> 
> Hey John,
> 
> Yeah, the repacking is what was described in the original link I sent.
> As far as I'm aware, the RF channel seems to be mostly irrelevant when
> tuning ATSC with a digital tuner.   For example, here's the relevant
> w_scan output for another local station, KDKA:
> 
> -----
> $ w_scan -fa -A1 -x | tee dvbscan.txt
> w_scan -fa -A1 -x
> w_scan version 20141122 (compiled for DVB API 5.10)
> using settings for UNITED STATES
> ATSC
> VSB US/CA, DVB-T TW
> scan type TERRCABLE_ATSC, channellist 1
> output format initial tuning data
> WARNING: could not guess your codepage. Falling back to 'UTF-8'
> output charset 'UTF-8', use -C <charset> to override
> Info: using DVB adapter auto detection.
> 	/dev/dvb/adapter0/frontend0 -> TERRCABLE_ATSC "LG Electronics LGDT3303
> VSB/QAM Frontend": good :-)
> Using TERRCABLE_ATSC frontend (adapter /dev/dvb/adapter0/frontend0)
> -_-_-_-_ Getting frontend capabilities-_-_-_-_
> Using DVB API 5.10
> frontend 'LG Electronics LGDT3303 VSB/QAM Frontend' supports
> INVERSION_AUTO
> 8VSB
> QAM_64
> QAM_256
> FREQ (54.00MHz ... 858.00MHz)
> -_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_
> 
> <snip>
> 
> 539000: 8VSB(time: 00:09.816)         signal ok:	8VSB     f=539000 kHz
> (0:0:0)
> 
> <snip>
> 
> tune to: 8VSB     f=539000 kHz (0:0:0) (time: 03:06.319)
>          8VSB     f=539000 kHz (0:0:0) : updating transport_stream_id: ->
> (0:0:2501)
> service is running. Channel number: 2:1. Name: 'KDKA-HD'
> service is running. Channel number: 2:2. Name: 'StartTV'
> service is running. Channel number: 2:3. Name: 'DABL'
> -----
> 
> 
> According to this page
> <https://www.rabbitears.info/market.php?request=print_station&facility_id=25454>,
> KDKA is channel 25.  And cross-referencing with
> <https://www.sigidwiki.com/wiki/ATSC_Broadcast> I see that the lower
> edge of channel 25 is 536 MHz.   Add 3 (half of the 6 MHz bandwidth),
> and you get 539 Mhz, which is exactly what w_scan reports above.
> 
> Now let's look at WPXI's new channel 23.   In the same table above,
> channel 23 is 524 MHz + 3 = 527 MHz.
> 
> Here's the relevant line from w_scan for the WPXI frequency of 527MHz:
> 527000: 8VSB(time: 00:48.319)         signal ok:	8VSB     f=527000 kHz
> (0:0:0)
> 
> But if I look later in the w_scan output where it tunes to the "signal
> OK" frequencies, it seems to not find anything:
> 
> tune to: 8VSB     f=527000 kHz (0:0:0) (time: 00:56.021)
>          Info: no data from PAT after 6 seconds
>          Info: no data from VCT(terr) after 26 seconds
> 
> 
> Is it possible that this station is broadcasting in a way that isn't
> compatible with the TV Wonder 600, or the related software that is using
> it?   Or perhaps that the TV Wonder 600 just isn't good at receiving TV
> on channel 23?
> 
> 
> Thanks
> -WD

Hi Will:  I thought the link that I posted was implying that the WPXI 
transmission on Channel 23 was analog, not digital, which might explain 
why your digital tuner finds nothing.  I would guess that analog 
nowadays might meet some availability stipulation while ensuring that 
very few people would actually use it.  But you need local info...