BBC 1,2,3,4 gone

Myxomatosis

It seems my FTA box cannot tune into the transponder (10773 H) which carries the main BBC channels. Over the last few days the channels have been cutting out constantly and now today they are totally gone. BBC1 south, east etc work fine as it is on a different transponder.

Why would a certain frequency be no longer available? Is it a case of having to fine tune the dish?

snaps

Have you recently brought a new cordless phone or moved a cordless phone transmitter near your satellite reciever? Also video senders and mobile phones can cause a satellite reciever to not recieve a certain transponder. I think i had a problem with the TPS Transponder on hotbird and also the pop/tiny pop transponder on astra 2. My cordless phone was the cause.

Myxomatosis

There are cordless phones and other wireless devices around the place but nothing new, i.e. they were there a long time before this problem began.

I have a second dish connected to the PC which I moved today and I'm trying to align it now but again no BBCs.

I have a sat finder which makes noise when pointed at a satellite, and makes different noises depending on what freq the LNB is tuned into. Using dvb-s software on the PC, when I change the channel to Ch4 and the sat finder is at it's least sensitive, I get 8/10 on the sat finder. When I change the channel to BBC and so the LNB changes, the sat finder registers 11/10
Yet no image on screen and 0 in the signal quality indicator.

Could this frequency be bombarded by some external source, like a transmitter of some kind on the mountain?

The dish 1 and set top box are at one end of the house and dish 2 and PC are at the other so I doubts it's anything like a cordless phone that would be effecting the both of them? Or could it?

biologikal

Do you have another STB that you can check on the dish/STB combo that's having problems? At least then you can eliminate cable/dish1 being the source of the problem.

Any sharp bends on any of your cable? I've read about some frequencies having problems getting up a wire with too-severe a bend in it.

I've never heard of a DECT phone affecting these channels/frequency, though it might be worth checking the frequencies of any wireless devices you're using. Or at least switching them off for a few minutes to see if your channels come back.

Myxomatosis

I brought the PC down to where the STB is and plugged Dish1 into it and still nothing from the transponder. ITV1 London is gone / going as well whatever transponder that is on.

So basically I have two separate dishes, a STB and a PC with DVB-S card, and any combination of them lead to the same results.

So either both dishes are misaligned in the exact same way, doubtful because I spent an hour last night tweaking one of them with no success, or both LNBs have malfunctioned in the exact same manner, which again is improbable.

I've unplugged cordless phone, turned off wireless router, switched of nearly everything electrical in the house, unplugged the broadband receiver on the roof. Nothing.

The channels do come back periodically, sometimes for a decent length of time, and the Signal Level is 70, Quality 98. The same as any of the working channels.

What on earth could be the problem?

EDIT:
I'm going to try re-align dish2 again, this time with a very short, and straight length of coax.

brightspark

Are you still getting other "H" channels?

I was called about a similar problem about a year ago, No BBC's etc, turned out none of the "H" band was working.

It's probably a faulty LNB, (or less likely, bad co-ax causing the LNB to fail to switch properly)