Re: LF: 472 tonight

[DK7FC <73dk7fc@googlemail.com>]

Hi Jan,

Am 29.05.2014 14:22, schrieb pa3abk:
> Seems you are very young at age :-)
No, i became 38 some days ago...
> Earlier users were forced to use MCW on the calling freq in order to 
> be heard by those stations who were not yet equipped with the "new" 
> technology to receive A1 transmissions.
> Some shiptransmitters used their generator frequency raw rectified, 
> which produced a 1kHz full modulated transmission.
Aah, that's a good idea! ;-)

> An early version of a switch mode modulator as we know now.
> In those days most vessels had only DC available a generator was 
> necessary to power the radiostation "at high voltage".
> Emergency calls had to be made in this mode. The Autoalarm only 
> reacted on this mode. Particular in high static regions this was an 
> advantage.
> Just like your chirpy mode, it is was quite distinctive for the human 
> ear within statics.
> http://en.wikipedia.org/wiki/Modulated_continuous_wave
Thanks for the informations.

73, Stefan

> DK7FC wrote On 29-5-2014 13:08:
> > MCW ???
> > What is that?
> > 73