Re: LF: DJ9!E and DF5QG CW 0n 472.5

[wolf_dl4yhf <dl4yhf@freenet.de>]

Hi Roelof,

Yes agreed, but in this particular case, whenever I compare lower and 
upper modulation sideband, the lower is always stronger. If it was just 
qsb / selective fading, none of the two should be favourized.
Cheers,
  Wolf .

Am 29.10.2012 15:51, schrieb Roelof Bakker:
> Hello Wolf,
>
> This phenomenon can be observed on many NDB's.
> I don't think that a sophisticated modulator is used.
> One reason for sure is selective fading.
> It is not uncommon to see one sideband completely disappear whilst the 
> other is quite strong and vice versa.
> An other possibility is the restricted bandwidth of the antenna in use.
> Many installations use an automatic antenna tuner, but this can get 
> awry in the long run by worn gearboxes etc!
> 73,
> Roelof, pa0rdt