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

Mike Perkins mikep at randomtraveller.org.uk
Mon May 9 11:20:36 UTC 2022

On 09/05/2022 12:11, John Pilkington wrote:
> 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...
But he's reporting identical setup conditions with nothing changed except the mythv version. The 
hardware is immaterial here. It is *just* possible that trees may have come into leaf between his 
testing with V31 and the upgrade to V32, but I'm not buying that.


Mike Perkins

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