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Date: | Thu, 13 Nov 2003 13:17:46 -0600 |
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Does anyone know what frequencies aircraft us when going over seas? I have
heard it is hF but I'm not to sure.
Blake
-----Original Message-----
From: Blind-Hams For blind ham radio operators
[mailto:[log in to unmask]]On Behalf Of
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Sent: Thursday, November 13, 2003 6:42 PM
To: [log in to unmask]
Subject: Re: OT - Line Voltages, Frequency in History
Message-Id:
<20031113184200.WMDK17368.imf20aec.mail.bellsouth.net@[68.212.98.27]>
Martin wrote:
>As for why aircraft use 400 HZ, you are all right but there is
>even one more reason. While I don't know why the exact number of
>400 Hertz, the biggest reason for using a higher frequency is the
>size of inductors such as what you have in motors and transformers.
<snip>
>I think that we'd get pretty tired of hearing that mosquito
>whine everywhere very quickly.
I get my share of aeronautical mobiles check in with me when I'm ncs
for the Maritime mobile service net and you always hear a hint of that
400 hz and its harmonics.
Also note that on hf a lot of the aero comms sound like there's a
little rf feedback into the audio. Harder to get a good ground up
there <grin>.
73 de nf5b
Richard Webb
Electric Spider Productions
"They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety."
--- Benjamin Franklin, NOvember 1755 from the
Historical review of Pennsylvania
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