Quantcast Figure A2-2. Skywave Propagation

 

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Appendix II. PROPAGATION OF RADIO WAVES
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TM-11-5820-919-12 Radio Set AN/PRC-104(A) (NSN
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Figure A2-3. Relative Skip Distance for Two Different Frequencies


TM 11-5820-919-12
Figure A2-1. Ground Wave Propagation
Figure A2-2. Skywave Propagation
effectiveness of different segnlents depending on the
communicate with stations on the other side of the world
time (less than 100 miles and between 100-500 miles,
The winter months are better than the summer months
respectively).
because of the high summer static level especially in
equatorial parts of the world
A2-13. 2 thru 5 MHz. This band is useful during
A2-15.10 thru 15 MHz. This band is the best choice for
daylight hours for intermediate and short-range
skywave communications and good for long range
reliable intermediate  and long range commi8nication
(several thousand miles) during the light. The static
during all propagation condition. During very low levels
level is highest during the summer.
of sunspot activity , the band will not be useful at night
but improves greatly at dawn and holds up w ell until
dusk.
A2-14. 5 thru 10 MHz. This band is similar to the 2
thru 5 MHz and except long-range communication is
A2-16.15 thru 25 MHz. This band is highly variable and
possible) during daylight hours under good c(conditions
(high sunspot activity . The signals follow the
quite dependent on sunspot activity. When conditions
darkness path best and during winter it is possible to
are good , it will be useful during day and
A2-2


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