🔍 Key Concepts

• RADAR frequency bands used in marine navigation (X-band and S-band) • Relationship between wavelength, frequency, and band names (VHF, UHF, SHF, EHF) • Typical frequencies in GHz used for shipboard navigation radar

💭 Think About

• Recall the approximate frequencies (in GHz) for common marine radars and match those frequencies to the correct band name. • Think about where VHF and UHF are normally used (like marine radios or TV) and whether those frequencies are high enough for radar with small antennas and good resolution. • Consider how wavelength affects radar antenna size; which band gives a short enough wavelength to fit on a ship’s mast and still give good target definition?

✅ Before You Answer

• Know the approximate frequency ranges for each band: VHF, UHF, SHF, EHF. • Match X-band (~9 GHz) and S-band (~3 GHz) to the correct spectrum band name. • Eliminate bands whose normal uses you already know (e.g., marine VHF radios) so you’re left with the band typically used for navigation radar.