what this the freq and time for the net please?


thank you!

BRETT K WINCHESTER  PM  KD7JN   VOLUNTEER & READING SERVICES MANAGER
[log in to unmask]     http://www.icbvi.state.id.us/brochure/RADIO.HTM 
Member IAAIS International Association of Audio Information Services
IDAHO COMMISSION f/t BLIND & VISUALLY IMPAIRED - ICBVI
P O BOX 83720,    341 W WASHINGTON,    BOISE IDAHO  83720-0012
208-334-3220 ext 104 +7=voice mail after hours,                    Fax  208-334-2963


>>> <[log in to unmask]> 11/13/03 05:41PM >>>
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