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Topic:
No PBS signal on only one TV of MATV system.
This thread has 4 replies. Displaying all posts.
Post 1 made on Sunday June 19, 2022 at 13:16
csiPost
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June 2022
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Can anyone explain how it is possible that only my Toshiba fails to pull in PBS when the Samsung on the same branch 3 feet away does, along with 2 more sets way further away from the amp, all having the same splitters, with the same loss on all outputs? Any input is welcome.
URC MX-900s/350
Post 2 made on Monday June 20, 2022 at 01:37
Brad Humphrey
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2,322
You assume that the tuners are all the same in each brand of the TVs. They are NOT!
And some absolutely do a better job of tuning in channels than others.

As far as what you can do.... To troubleshoot things like this, you really need a signal meter. Without having any clue about how much signal you are working with, you are simply guessing and trial & error. You have an RF amp in your system, what if you already had enough signal. You know it is possible to clip the input of an RF amp with to much signal, causing harmonic distortions and overload. That can cause a lot of TV tuners to not be able to lock onto a signal.

Have you tried bypassing the amp & splitters and connect the coax directly to the Toshiba? Result?
Post 3 made on Monday June 20, 2022 at 13:45
Redbiker98
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November 2020
182
Also, how old is the Toshiba? Maybe it's a bad tuner?

Have you tried hooking up the Toshiba to the cable plugged into the Samsung and vice versa? The splitters lose signal, maybe that line has lost too much signal.
OP | Post 4 made on Monday June 20, 2022 at 20:25
csiPost
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Thanks guys, The Toshiba is 8 yrs old & still won't get ch12 with or w/o the amp, direct from the attic antenna without the system.
All signals are between -50 & -40 dBs, all the sets are within 60' RG6 of antenna and I'm pretty far from the metro.

Brad got me thinking about the older tuner so I checked the menu & I noticed that the physical channel number was different than on the other sets somehow & only for PBS. When I tuned up to the next slot there it was - all 3 PBS subs. I have no idea how it changed and didn't affect the newer sets, but when I re-scanned, they all came back. It's as if the other 3 tuners saw the move & corrected the virtual channel for it? The Toshiba is still terrible but now gets the same broadcasts.
Another 2 pair of eyes ! Thanks for the kick.

Last edited by csiPost on June 20, 2022 23:18.
URC MX-900s/350
Post 5 made on Tuesday June 21, 2022 at 10:30
Redbiker98
Regular Member
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November 2020
182
I'm glad you got it figured out.


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