9-13B5 A
 What is the primary purpose of both a high and a low I.F. system in a HF receiver?
A. Using a high first I.F. amplifier results in eliminating image signals. 
B. Using a high first I.F. amplifier results in less intermodulation products.
C. Using a low first I.F. amplifier results in fewer third harmonic signals.
D. Using a low first I.F. amplifier results in greater signal amplification. 
