Honeywell KHF 1050 - 7.C. Flight Test

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KHF 1050 SYSTEM INSTALLATION MANUAL
Page 2049
Revison 2 23-10-09 Apr/2006
7.C. Flight Test
While in flight, establish communications with another HF station. It is important
that the frequencies selected be appropriate for the distance between the aircraft
and the other station (see “Table 2008 - Typical HF Signal Propagation Distance”
). Request a signal and audio quality report, preferably on several different
operating frequencies.
Table 2008 - Typical HF Signal Propagation Distance
for Common Aviation Bands
Frequency Band
(MHz)
Daytime Distance
(miles)
Nighttime Distance
(miles)
2.8 & 3.0 up to 100;
often unusable
up to 400
3.4 up to 150;
often unusable
up to 800
4.4 up to 200 up to 1000
5.5 up to 300 100 to 1200
6.5 100 to 600 200 to 1500
8.8 200 to 800 400 to 1500 or greater
10.0 300 to 1000 500 to 1800 or greater*
11.1 400 to 1200 600 to 1800 or greater*
13.3 600 to 1500 or greater often unusable
17.9 700 to 1800 or greater* often unusable
21.9 900 to 1800 or greater* often unusable
NOTE: The transition between daytime and nighttime distances may occur
gradually over a several hour period. During this transition, communication
distances between the daytime and nighttime distances listed will generally
be realized.
* At times, communication may not be possible on this band during this time frame.
However, during periods of good propagation, worldwide communications may be
realized.