[mythtv-users] OT: Moved aerial & lost one mux (UK Freeview)(solved)

[Andre Newman MythTV]

> 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.

Andre

> 
> 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.
> 
> _______________________________________________
> mythtv-users mailing list
> mythtv-users at mythtv.org
> http://lists.mythtv.org/mailman/listinfo/mythtv-users
> http://wiki.mythtv.org/Mailing_List_etiquette
> MythTV Forums: https://forum.mythtv.org