Welcome to the Forum

First thing to check is that you are tuning into only one transmitter. Channels appearing in the 800 range are an indicator that more then one is tuned in.

Carry out manual tuning instructions before anything else:

http://myhumax.org/forum/topic/week-old-9300t-and-epg-wont-fill-up-for-week#post-7097

michaelforreste – 22 minutes ago  » 

Dear Barry

Thank-you. I’ve done what you suggested (very useful as I had no idea there is such information available). The reception is much better but still occassionally ‘dropping’ or ‘jumping’. By the way what do you mean by the 800 range. I couldn’t see that on the postcode checker.

thanks

Michael

He means that if you look in your channel list that you have channel numbers larger than 800. When you do an autotune the box starts looking for Freeview channels starting at uhf 21 and then up to 68. Since DSO transmitter power increases this means you may have transmitters in range that previously weren’t. If these happen to use a lower uhf channel than the one you should be using the wrong transmitter gets stored at the correct freeview logical channel numbers. When the scan gets to the correct one for your location it stores them above channel 800 so you now have say ITV at 103 from the wrong transmitter and the strong one at 8xx. This makes a right royal mess of series recordings.

Deleting all your channels and manually adding the 5 uhf frequencies eliminates this problem. If you have done this correctly and still have reception issues then that does mean you have a reception issue, but not always down to your aerial, the signal can simply be too strong if the transmitter is very close (easily solved), or you may have amplifiers fitted you no longer need.

Firstly if you used the DTG website to identify which transmitter you should be using, then if you post the transmitter, how far you are from it and the affected channels it would help to ascertain whether it may be an aerial issue.

By the aerials are analogue devices so there’s no such thing as a digital aerial. That doesn’t mean a specific design of an analogue aerial won’t give you better reception.

It looks as though the aerial grouping for Dover is the same after DSO as before (CD). From your distance and bearing I conclude you are somewhere in the Canterbury area for which an amplified extra high gain aerial is suggested (source wolfbane).

Digital Uk site also predicts variable to poor reception.

Also if signal level is poor it is more susceptible to interference, so it is important to have a high grade fully screened (foil and braid) cable from the aerial.