When I got my license in 1960 (last millennium), there were three modes:
A1. - Keyed carrier
A2 -. Keyed "AM-modulated tone" carrier
A3 -. AM modulated transmission
Multitude of modulation modes with their characteristics and their
abbreviations are now known.
I found it funny that Stefan has felt almost offended that you have called
young.
Almost by bending the old me I would be a compliment to call me young.
Honor the "old timers" who remember the A2 and feel young.
73 ES DX
Federico EA2HB
----- Original Message -----
From: "DK7FC" <[email protected]>
To: <[email protected]>
Sent: Thursday, May 29, 2014 3:28 PM
Subject: Re: LF: 472 tonight
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
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