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

John Pilkington johnpilk222 at gmail.com
Mon May 9 11:11:05 UTC 2022

On 09/05/2022 11:41, James Abernathy wrote:
> On Sun, May 8, 2022 at 8:39 AM James Abernathy <jfabernathy at gmail.com 
> <mailto:jfabernathy at gmail.com>> wrote:
>     Results of my first test of the Hauppauge WinTV Quad HD in a new
>     system with Ubuntu 20.04.3 LTS and mythtv v31.
>     I installed Ubuntu 20.04.3 minimal and added the apt repository for
>     v31. The install was as expected and I setup the 4 tuners to
>     correspond to the Quad tuner PCIe card.
>     I used a table top antenna in my lab since I didn't have a tap for
>     the big attic antenna.  I could not get the PBS station 40 miles
>     away as expected but the nearby stations all scanned.  While
>     watching LiveTV, I noticed that the signal strength displayed was
>     80-100% instead of 40-50% in V32 Ubuntu 22.04, my production backend.
>     I'll try later today or tomorrow to move the test PC to a room that
>     can access the same 8-way splitter that all my other tuners and tvs
>     are connected to.  At this point it's looking like the difference
>     between v31 and v32 or Ubuntu 20.04 and 22.04.
>     Where I'm located with respect to the TV towers you can get great
>     signals with a coat hanger jammed into the F-connector.
>     Jim A
> I've narrowed down when the signal reporting gets changed. On my newly 
> built test system with MythTV v31 on Ubuntu 20.04.3 LTS my signals were 
> reported as ~100% on most of my channels using my Hauppauge WinTV quadTV 
> as it had for years on my production backend.
> I added the ppa:mythbuntu/32 repository and upgraded to v32. The system 
> updated all 21 packages and everything was working as before but now on v32.
> But when I use Watch Live TV all my reported signal strengths were 
> between 40-50%.  So the change is MythTV v32 related and not the version 
> of Ubuntu. The OS remained at Ubuntu 20.04 with latest patches without 
> any package updates to Linux during this test.
> Jim A

So the comparison is between the base distro v31 and current 32 fixes, 
and quite a lot may  have happened over that span.  But I think you are 
giving the number too much significance. IMHO it's primarily for antenna 
alignment, and a bigger number in the same setup is better, but the 
absolute value probably doesn't mean much; particularly with an indoor 
antenna, a complicated feed system of passive splitters and maybe badly 
terminated cable runs.  And the trees round me are coming into leaf...


John P

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