document.write('<br>\nWINLINK Exercise for week 10/20/2025. please use the reply function of the 213 and send to K7ACT. <br>\n <br>\nWhat is the purpose of the \"Notch filter\" that is found on many HF radios? <br>\n <br>\nA. To restrict the transmitter voice bandwidth. <br>\nB.  To reduce interference from carriers in the receiver passband. <br>\nC. To eliminate receiver interference from impulse noise sources. <br>\nD.  To enhance the reception of a specific frequency on a crowded band. <br>\n\n<br>\n');