[mythtv-users] Tuning problems

Damian myth at surr.co.uk
Tue Jan 1 22:29:12 UTC 2019

On 01/01/2019 21:00, John Pilkington wrote:
> On 01/01/2019 19:38, Damian Surr wrote:
>> On 28/12/2018 22:04, John Pilkington wrote:
>>> On 28/12/2018 16:11, Damian wrote:
>>>> Hi all,
>>>> I've had tuning issues for months now, but we mainly watch 
>>>> downloaded content, so I've not worried too much about it.
>>>> However, there's not much point using MythTv without the TV bit! 
>>>> :-) And I know how great it can be when it's working, so I'd like 
>>>> to sort this out if I can.
>>>> Here's the issue ...
>>>> To keep things simple, I've got 2 SD tuner sticks installed at the 
>>>> moment. I've got a HD one waiting to be used too, but I'm not too 
>>>> worried about HD TV. I'd rather just get the 2 SD sticks working 
>>>> again.
>>>> I'm in the UK and should be (at least we used to be!) in the Mendip 
>>>> area.
>>>> Here are the details hoe how Mendip 'should' tune ...
>>>> https://ukfree.tv/transmitters/tv/Mendip
>>>> The settings are different to what they were a few years ago, but 
>>>> to me it looks like I the main channels are at 562000000Hz, 
>>>> 578000000Hz.
>>>> When I do a full scan, with MythTV, it gives me transports like ...
>>>> 698000000 Hz,
>>>> 738000000 Hz
>>>> 690000000 Hz
>>>> 721833330 Hz
>>>> Auto turn always results in finding channels, but they are 
>>>> temperamental and unreliable.
>>>> This wouldn't be a problem as MythTV always seemed to tune to the 
>>>> wrong transports. The problem is that if I edit the transports, 
>>>> like I have in the past, to mathc up frequencies, then the system 
>>>> fins nothing!
>>>> Back when things used to work, manually editing the transports 
>>>> would solve everything and I'd have rock solid tuning. however, 
>>>> that's not been the case for along time now.
>>>> Any ideas how to get to the bottom of this?
>>>> I should mention that if I need to go to the command line, my level 
>>>> is 'ls' and 'top'! :-) I can follow instructions, but have no idea 
>>>> what I'm doing in there.
>>>> One final thing to mention is a new error message that I'm noticing 
>>>> when I go into the Multiplex editor. It's stated saying:
>>>> "Sorry, the Transport Editor can only be used to edit transports 
>>>> which are connected to a card input."
>>>> However, it then seems to work fine.
>>>> Hope some of you geniuses can help! :-)
>>>> Cheers,
>>>> Damian
>>> Hi Damien:  This may help:
>>> https://www.a516digital.com/2018/02/freeview-frequency-changes-27th-feb-and.html 
>>> I don't know how authoritative it is, but it notes frequency changes 
>>> made at Mendip in February, although it doesn't look as if they 
>>> affected the main muxes. Last time I looked ukfree.tv hadn't caught 
>>> up with changes made at my local transmitter around that time.
>>> John P
>> Thanks for this John,
>> Although I don't understand it enough to know the implications :-)
>> I've just tested out an actual real TV, and it scanned all channels, 
>> so I assume Myth should be able to find them too.
>> Regards,
>> Damian
> Hi Damian:  *If* your best transmitter is Mendip and you have DVB-T 
> tuners I think you need the main PSB muxes on 562 and 578, and Com 4,5 
> and 6 on 690, 570 and 594 MHz - ie the numbers quoted followed by 
> 000000.  The 'local' low power transmitter for Bristol is on 714 MHz. 
> Have a line for each, set its Bandwidth to 8 MHz and try a scan of 
> 'All known transports'   You might be able to input fewer muxes if you 
> 'enable scanning of linked transports,' but there have been changes in 
> the details and I don't like exploring on a working system!
> The other frequencies listed will need DVB-T2-capable tuners. Skip for 
> now.
> The 'connected to card input' thing is likely looking for something 
> like 'dvb' in the 'Video Source' box on the Channel Editor page.  When 
> I click OK it goes away...
> John

I've tried, many times, to manually set the transports to the correct 
frequencies, and then scan only those frequencies.

That used to work fine, but doesn't any more.

I'm at a loss on how to get this working.

Mendip is the transmitter that used to work fine.

I've used an app on my phone to set the angle of my antenna as 
accurately as I can.

I've looked at the antenna's, on the roofs of neighbours houses, and the 
angle looks the same as mine.

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