[mythtv-users] Signal strength now reporting 50% instead of 100%

[John Pilkington]

On 10/05/2022 16:13, Paul Harrison wrote:
> On 09/05/2022 13:44, James Abernathy wrote:
> 
>>
>>
>> On Mon, May 9, 2022 at 8:33 AM James Abernathy <jfabernathy at gmail.com> 
>> wrote:
>>
>>
>>
>>     On Mon, May 9, 2022 at 7:41 AM Paul Harrison <mythtv at mythqml.net>
>>     wrote:
>>
>>         Could be this commit which changed the signal strength range
>>         for DVBv5 :-
>>
>>         https://github.com/MythTV/mythtv/commit/5d76841b8c1878
>>
>>
>>         You could  try starting the backend with --dvbv3 to see what
>>         you get with the old DVB v3 API.
>>
>>
>>         Like other have said if it not causing you any problems then I
>>         wouldn't worry to much about it.
>>
>>
>>         Paul H.
>>
>>     You are correct. Starting the mythtv-backend with --dvbv3 does
>>     restore the signal strength to what I was seeing on v31.
>>
>>     So what I'm hearing is by default in v32 the signal strength is
>>     based on dbm instead of %. Are there any problems using --dvbv3
>>     instead of the default??
>>
>>     Jim A
>>
>>
>> The problem I see with this new change in dvbv5 is the screen display 
>> still says "%" after the number.  There is no way this makes sense to 
>> me compared to other tuners. Now that I know I can follow it. but in a 
>> system with a HDHomeRun tuner and a DVB tuner on the same antenna the 
>> concept of one tuner at 100% and another at 50% is confusing.
>>
>> Jim A
>>
>>
> Unfortunately you can't compare the signal levels from different devices 
> like that they all report the signal levels differently. Even DVB cards 
> from the same manufacturer can report signal levels differently.
> 
> 
> Paul H.

All my tuners are fed via splitters from a single antenna-preamp, so 
absolute signal-strenth percentages mean even less; but big-is-better 
should still apply (and is used in Klaas's updates) except in 
close-to-the-transmitter use-the-antenna-to-power-the-kettle situations. 
  Signal-to-noise ratio should be more important, but again measurements 
are unlikely to be consistent across devices and manufacturers.

John P