Thanks for the advice. The aerial is horizontal and pointing NE to C. Palace. I did retune several times. Weird.. once I did actually get ALL channels but then 3,4,5,6,7 just disappeared a day later. Subsequent retunes have failed to find 3-7.
I'll try and reset to factory as you advise.
For interest if all the channels are being transmitted from a single transmitter CP why do some fail to show up?! According to Comet, my area should receive all Freeview channels bar none.
John
Assuming you have already set the Samsung to Factory settings then it may be you have a poor signal. ITV, Ch4, Ch5 and 6 (ITV2) are fed from the same QAM64 Multiplexer. Pre digital swichover there are two QAM64 muxes and if the signals are weak it is normally these two muxes that you lose first.
BBC1 & BBC2 are transmitted on the same QAM16 mux, receivers are much more resilient to weak signals using QAM16.
What does puzzle me though is you say you've lost channel 7, this is BBC3 and is transmitted on the same mux as BBC1. Therefore make sure you have reset to factory settings before you retune.
If you still have problems, take a look at
this page, it shows which channels, together with their respective channels numbers, are broadcast on which Mux (both pre-DSO (Digital switchOver) and post DSO).
Pre-DSO; Mux 2 and, from memory, Mux A are QAM64 Muxes, the rest are QAM16. Check which channels you are receiving and if they are all from the same mux then your problem is probably a poor signal.
Post-DSO more muxes will use QAM64. I believe the Mux used for HD will use QAM256.
(
QAM = Qaudrature Amplitude Modulation, the number 16 or 64, simply put, represents the amount of information contained in the signal, therefore the higher the number the more data in the signal.)