If you do any RTTY contesting you will want 250 Hz filters, I have two Inrads. 73, Tom W1TO ----- Original Message ----- Subject: [1000mp] Data fiters What width Inrad filters would be recommended for the Mark V Field for data, RTTY, PSK31? I have added a pair of 1.8 KHz and a 500Hz filters to the receiver and would like fill the filter lineup for NAR2. I do not operate CW. John K3YS