By United States Marine Corps

USMC box antenna guide MCRP 6-22D Marine Corps.. free LEAF UNBOUND variation NO BINDER.

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The more words per minute, the higher the rate and the modulation frequency, so a wider or greater bandwidth is needed. To transmit and receive all the intelligence necessary, the antenna bandwidth must be as wide or wider than the signal bandwidth, otherwise it will limit the signal frequencies, causing voices and writing to be unintelligible. Too wide a bandwidth is also bad, since it accepts extra voices and will degrade the S/N ratio. Figure 2-7 shows how signal bandwidth is defined and gives some examples of bandwidth required to transmit ordinary types of intelligence.

Increasing receiver amplification cannot improve the S/N ratio since both signal and noise will be amplified equally and S/N ratio will remain unchanged. Normally, receivers have more than enough amplification. 1-24 ____________________________________ MCRP 6-22D Natural Noise Natural noise has two principle sources: thunderstorms (atmospheric noise) and stars (galactic noise). Both sources generate sharp pulses of electromagnetic energy over all frequencies. The pulses propagate according to the same laws as manmade signals, and receiving systems must accept them along with the desired signal.

If the antenna and transmission line are balanced with respect to the ground, then the noise voltages will be balanced and cancel Antenna Handbook ____________________________ 1-25 with respect to the receiver input terminals (zero voltage across terminals), and this noise will not be received. Near-perfect balance is difficult to achieve, but any balance helps. Other ways to avoid manmade noise are to locate the most troublesome sources and turn them off, or move the receiving system away from them.

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