Technician exam question T4A03

WhyShort, heavy-gauge wires are used for a transceiver's DC power connection to minimize voltage drop when transmitting. At the current a transceiver draws while transmitting, even a small amount of wire resistance produces a voltage drop large enough to make the radio's output power sag or its transmitter reset, so keeping the DC leads short and heavy-gauge minimizes that drop, answer A. Matching output impedance (B) is a concept from RF transmission lines, not DC wiring, avoiding RF interference (C) is what bypass capacitors and chokes are for, and radiated loss from a DC cable (D) isn't a meaningful concern at these frequencies.