Technician exam question T9A07
Subelement T9, ANTENNAS AND FEED LINES· Group T9A
What is a potential drawback of using a handheld VHF transceiver inside a vehicle that lacks an externally mounted antenna?
- A.Signal strength is reduced due to the shielding effect of the vehicle (correct answer)
- B.The bandwidth of the antenna will decrease, increasing SWR
- C.The SWR might decrease, decreasing the signal strength
- D.The handheld will overheat due to reflected power in the vehicle
WhyUsing a handheld VHF transceiver inside a vehicle without an externally mounted antenna can reduce signal strength due to the vehicle's shielding effect. A vehicle's metal body acts as a partial shield around a handheld's antenna, attenuating the signal before it can radiate clear of the car, so signal strength suffers when the antenna isn't mounted externally, answer A. This shielding effect doesn't change the antenna's own bandwidth or SWR (B, C), those are properties of the antenna itself, and reflected power inside the vehicle isn't a realistic overheating risk at handheld power levels (D).
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2026-2030 NCVEC Element 2 pool (public domain); the explanation above is original writing, see our methodology.
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