[mythtv-users] Tuning problems

John Pilkington johnpilk222 at gmail.com
Tue Jan 1 23:53:48 UTC 2019

On 01/01/2019 22:29, Damian wrote:
> 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.
> Regards,
> Damian

The data on the ukfree site for Mendip seems to be a mix of largely 
obsolete info, and much of the frequency/mux data on the web now looks 
outdated.  There are user contributions saying that some of the planned 
changes at Mendip have not happened.  Inter-mux links may still work...

The frequencies that you have been seeing seem to be in the 'old' Mendip 


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