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TM
11-5820-917-13
EL9TE033
E f f e c t of Range on HF Propagation.
m a t e l y 2.4 MHz.  T h e l-hop mode shows the characteristic splitting of the 0-mode
and X-mode.  The upper part of the display shows received power vs frequency.
It can be used as an indicator of frequencies with greatest received signal
s t r e n g t h , however care must be taken in extrapolating such data if the sounder
system utilizes different antennas than the communication systems on the circuit.
7-19. INTERPRETING THE RCS-4B DISPLAY
7 - 2 0 .  I n general, the "best" communication frequencies are those showing the
following characteristics (in order of importance):
A nearly continuous trace on the CRT throughout the band of interest,
preferably near the MOF.
b .  Maximum received signal strength on the upper bar graph (some sacrifice
i n signal strength can sometimes be advisable if use of a much higher frequency
is possible).
M i n i m u m multipath propagation or total time delay spread.
c.


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