[mythtv-users] OT: Moved aerial & lost one mux (UK Freeview)(solved)
Andre Newman MythTV
mythtv-list at dinkum.org.uk
Wed Oct 18 12:42:00 UTC 2017
> On 17 Oct 2017, at 22:08, Simon Hobson <linux at thehobsons.co.uk> wrote:
> I wrote:
>> When I was testing with the aerial in the lounge (didn't want to miss Red Dwarf !) I did a full scan on the TV and got all 5 muxes I should. Now I've moved it to the loft, pointing in the same direction, but with a longer cable (WC100/WF100) - I can't get anything on one mux.
>> The other 4 muxes are fine, plenty of signal, just the Com6/ArqB mux on C22+ (482.2MHz) is "missing". It's almost as though there's a notch filter in place - connected direct to the TV it gives "no signal" but just occasionally flickers a bit of pixellated picture and a "click" of sound.
> OK, went up in the loft and just moved the aerial a couple of feet - nothing more, just moved it a couple of feet and problem gone. That's really strange, can't see any logic to it - but there we are !
That’s entirely reasonable, it’s possible there was a null in that exact location for that exact frequency, sounds like you moved the antenna out of the null. Just like walking around a bit to get a better mobile phone signal.
Glad you got it working.
> But answering various questions :
> Yes, on the other muxes there was plenty of signal. I tried putting a 6dB attenuator in the connection and the TV still had good signal on the other muxes.
> Cable is good quality - WC100 and WF100, about 15-20m total. No taps or stubs, just one intermediate connection (F plugs and barrel connector).
> Anyway, things are working now, and I've managed to get a listings update via a rather roundabout route.
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