[dba-Tech] Question about Radio technology

And with Micro waves you can cook things :-) 

-----Oorspronkelijk bericht-----
Van: dba-tech-bounces at databaseadvisors.com
[mailto:dba-tech-bounces at databaseadvisors.com] Namens Lembit Soobik
Verzonden: maandag 24 november 2003 18:57
Aan: Discussion of Hardware and Software issues
Onderwerp: Re: [dba-Tech] Question about Radio technology

AM is amplitude modulation
the amplitude of the transmitter frequency is modulated with the (audio)
signal to be transmitted.
the receiver then uses a rectifier to get the signal back AM bands are
long wave (around 100 to 150 kHz, IIRC), medium wave where you have most
of the radio stations, short wave where you have HAM radio and stations
that sent to very high distances. Short wave is used for sending around
the world because the short wave is reflected in the higher level of the
atmosphere, then again on the earth and back up, thus can trabel around
the world, while the lower frequencies go straight only.
FM  is frequency modulation, that is, the signal is used to change the
frequency of the transmitter while the amplitude stays constant.
therefore amplitude changes do not influence the audio signal, and the
received audio signal is independent of most noise 8which would
influence the amplitude only.

dont know whether this was clear enough. otherwise feel free to ask

Lembit Soobik

----- Original Message -----
From: "Arthur Fuller" <artful at rogers.com>
To: "'Discussion of Hardware and Software issues'"
<dba-tech at databaseadvisors.com>
Sent: Monday, November 24, 2003 9:37 PM
Subject: [dba-Tech] Question about Radio technology


> Someone asked me to explain the difference between AM, FM and short
wave
> and I suddenly realized that I have huge gaps in my alleged knowledge
of
> same. Can someone point me to a net-splanation or supply one?
>
> TIA,
> Arthur
>
>
> _______________________________________________
> dba-Tech mailing list
> dba-Tech at databaseadvisors.com
> http://databaseadvisors.com/mailman/listinfo/dba-tech
> Website: http://www.databaseadvisors.com
>


_______________________________________________
dba-Tech mailing list
dba-Tech at databaseadvisors.com
http://databaseadvisors.com/mailman/listinfo/dba-tech
Website: http://www.databaseadvisors.com