The units refs. 7310, 7311, 7328 do not keep the memorised channel in the assigned channel. Because of this, I now receive noise or another channel where there should be a memorised channel.
-->The reason for this is that the channel was memorised with the AFC on (Automatic Frequency Control).
The solution consists in reprogramming the channel with the AFC disabled.
Once it is reprogrammed, switch the AFC back on again.
The enabling and disabling of the AFC is carried out in the installation menu.