We dicovered program BVN scrambled and low quality 35% signal

Poor signal strength is the bane of any receiver. See if you can improve matters by connecting your antenna to a good antenna amp and connect latter to your humax. Bet it works better. Also position as high as possible and direct it in the direction of most of the stations you want to receive.

Check the signal level and quality. Reseat all aerial connections.

Sounds like you have a problem with the aerial or the connection cable. Hows the signal level and quality on the other channels? You need about 80% quality and 50-80% signal level for a decent stable picture. Quality is by far the most important.

You should not need a decoder for SABC 1,2,3, the signals are not encoded. If you are having problems with the picture quality you ar most likely using a UHF antenna where the SABC programs are broadcast in VHF at present. Fit an additional VHF antenna and a combiner box or change to a universal antenna.

Check if it has a scrambled image on all sources ie - DVD- VCR - cable/satellite box. Since the PIP is normal it sounds like the signal source is bad.
Post back with more info about your set up (what's hooked to your TV) if you need more info

new codes 00 bo b8 4f 04 e6 5f 87 80
01 a3 eb ec 07 d6 49 d2 eb
some stations are scrambled

telewest codes

00 04 4d 6f 7d d5 c9 f7 9b
01 16 cf 0c a7 a7 14 d2 22

what brand of set top box do you have?

if you are getting signal of the proper strength and quality the cabling is good.the problem is the box trying to decode the signals.a lot of signals are encripted and have to be decoded by the box.if the box is not responding fast enough you will see bloches on the tv.if you see scrambled channel you are not payinfor that channel.and if you are paying for a channel and it comes up scrambled your box is not working correct.get your company to upgrade the box.