Output Power
Similar Terms: Transmit Power, pp, rms, RMS, PP, Power Output, PTP, P-T-P, peak to peak
Output power, or Transmit Power, is measured either as peak to peak (pp) or Root Mean Squared.
(PP is also a shorter term for polypropylene).
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Peak to Peak (pp) is far less accurate than rms. We make the analogy of pp like being the maximum speed shown on a car speedo, achieveable only on a good day, down hill with a tail wind. In other words occassional if you are lucky.
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Root Mean Squared (rms) is day in day out average continuous power. When comparing power outputs, you must compare like with like; because P-T-P numbers are 8 times higher than rms numbers.
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In fishfinders/sonars, the power output is the amount of sound energy emitted into the water by the Transmitter.
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Higher power output allows a higher penetration of Sonar signal through weeds and >Thermoclines, reaching greater depths and allowing better operation in noisy environments. However, the traditional way of thinking was that higher power output meant a better Fishfinder, but with the introduction of broadband transmitters using power more efficiently and alternating and spectrum scanning, the equation is no longer that simple because too much can be a disadvantage in very shallow water as with stronger signals comes more Noise.
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Some brands such as Lowrance & Simrad have redefined Output Power as being the sole determinate of good performance. Their broad band technology uses less power more efficiently & reduces the background Noise, enabling small Fish to be seen at a deeper depth.
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