Which will not improve the signal to jamming ratio?

Which will not improve the signal to jamming ratio?

• A. Increase transmitter power output
• B. Use an alternate route for communications (PACE)
• C. Move the antenna closer to the TOC
• D. Adjust, change or relocate the antenna

Answer: (C)

Improving the signal-to-jamming ratio means making the wanted signal stronger relative to the interfering jamming. You do this most reliably by boosting the signal at the receiver, rerouting around the jam, or shaping the antenna to favor the path to the TOC and suppress interference. Increasing transmitter power raises the received wanted signal, using an alternate communications route helps avoid the jammed path, and adjusting the antenna (its gain, direction, or placement) can improve directivity toward the TOC and reduce reception of the jammer. Moving the antenna closer to the TOC does not inherently improve the ratio. While the signal path to the TOC may shorten, the jammer’s signal path can change in the same way or even become more effective if the jammer is nearer or shares the same propagation environment. So this single move isn’t a reliable way to improve SJR, unlike the other options.

Improving the signal-to-jamming ratio means making the wanted signal stronger relative to the interfering jamming. You do this most reliably by boosting the signal at the receiver, rerouting around the jam, or shaping the antenna to favor the path to the TOC and suppress interference. Increasing transmitter power raises the received wanted signal, using an alternate communications route helps avoid the jammed path, and adjusting the antenna (its gain, direction, or placement) can improve directivity toward the TOC and reduce reception of the jammer.

Moving the antenna closer to the TOC does not inherently improve the ratio. While the signal path to the TOC may shorten, the jammer’s signal path can change in the same way or even become more effective if the jammer is nearer or shares the same propagation environment. So this single move isn’t a reliable way to improve SJR, unlike the other options.