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Figure A2-3. Relative Skip Distance for Two Different Frequencies
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TM-11-5820-919-12 Radio Set AN/PRC-104(A) (NSN
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Figure A2-4. Short Range (Less Than 100 Miles) HF Communications Effectiveness


TM 11-5820-919-12
early night but if sunspot conditions are poor. It may not
A2-24. Scenario (Figure A2-6). Your squad must set
be usable at all. This band is suitable for short range
tip an observation post (OP) as part of a road
(less than 10 miles) surface wave communication using
surveillance team.  You are required to check in with
a whip antenna.
your headquarters (50 miles east) once every hour. your
OP is in a mountainous region and a large mountain is
A2-17.  25 thru 30 MHz. This band is useful as a very
located between you and your head(quarters (see fig
short range (several thousand miles) communications
A2-6). Your frequency possibilities) are the same as in
during good propagation condition It is generally
situation 1
unusable for intermediate range communication.
A2-25.  Recommendation.  Your OP is selected to
A2-18. SITUATIONAL EXAMPLES.
give you a clear view of the area while camouflaging your
position with the mountain as a background. Your radio
location is selected to provide a clear path to your
A2-19.  The following examples demonstrate several
headquarters while shielding your transmissions from
different situations that might occur when attempting to
the enemy to reduce the possibility of being located with
establish a com munications link These examples will
radio direction finding equipment. Because you will be
help clarify the information on optimizing communication
maintaining a fixed location for an extended period of
time, you may use any antenna you wish.  The best
A2-20. SITUATION 1.
choice would be the N_ antenna. Your headquarters is
only 50 miles east, however there is a large mountain
A2-21. Scenario. You are under enemy fire and cannot
blocking direct waves. The NVIS, with a very high angle
move without great risk. It is 1400 hours local time and
of radiation, will bounce off the ionosphere and over the
you are and you are trying to  contact your Tactical
mountain Your transmissions might be copied b) the
Operation Center (10 miles south) to request air support.
enemy but your shielded location will minimize the
Your available frequencies are 2.138, 5.672, 9.193,
chances of being located. As the day progresses, you
11.272 and 16.385 MHz.
will want to change frequency in order to optimize
communications. The following recommendation should
A2-22. Recommendation. The tactical situation only
ensure constant communications.
permits the use of the w hip antenna. Since the station
with whom you want to communicate is only 10 miles
0001 to 0500 (dawn)
2.138 or 5.672 M}z
south . the whip antenna will be adequate. Considering
0500 to 1200
5.672 or 9.913 MHz
this to be short range surface w2ave, the best frequency
1200 to 2000 (dusk)
9.913 or 11.7211liz
selection would be a high one, in this case either 16.385
2000 to 2400
5 672 or 9.913 MHz
or 11.272
A2-23. SITUATION 2.
A2-4


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