Simple. Either the tuner is not sensitive enuf to pick up a weaker signal, usually coming from a distance station, or the station is broadcasting a weak signal to begin with, or both. I have both a weak station and a tuner (Perreaux) with less than optimum sensitivity and on that tuner I have a constant hiss on all but strong signals from close stations. On my Accuphase the same stations are dead quiet. Not much you can do about this that you haven't already done except, perhaps, move your antenna or try an antenna signal amplifier but I doubt that either will work as any benefit this might bring would really be minimal.
Note the differences you see on your tuners meter which measures signal strength as you go from station to station and note how this correlates with the noise factor.
One thing you can do, if the station is important to you, is to press the mono function button. This will make most of the noise go away, but you obviously get a mono signal.
Maybe someone else has some ideas, but I hope that will help.
Note the differences you see on your tuners meter which measures signal strength as you go from station to station and note how this correlates with the noise factor.
One thing you can do, if the station is important to you, is to press the mono function button. This will make most of the noise go away, but you obviously get a mono signal.
Maybe someone else has some ideas, but I hope that will help.