Yaesu FT-817 Operating Manual

Also see for FT-817 -: Brochure & specs Operating manual Technical supplement Manual Modification Instructions

24 FT-817 Operating ManualAGC (AUTOMATIC GAIN CONTROL)The receiver recovery time constant of the AGC system may be modified to match youroperating needs.1. Press the key momentarily, then rotate the knob, as needed, until OperatingFunction Row 8 [NB, AGC] appears on the display.2. Press the (AGC) key to toggle the AGC recovery time constant among the followingselections:“AGCauto” “AGCfast” “AGCslow” “AGCoff” “AGCauto” ……where “AGCauto” represents “AGCfast” on CW and DIG(AFSK), and “AGCslow” onthe voice modes.If “AGCoff” selected, the S-meter (which monitors AGC voltage) will cease to func-tion.NOISE B LANKERThe IF Noise Blanker may be useful in reducing or eliminating some types of impulse noise,especially noise generated by automotive ignition systems.1. Press the key momentarily, then rotate the knob, as needed, until OperatingFunction Row 8 [NB, AGC] appears on the display.2. Press the (NB) key to activate the Noise Blanker. The “” icon will appear at theright of the “NB” indication.3. Press the (NB) key again to turn the Noise Blanker off.IPO (I NTERCEPT P OINT O PTIMIZATION)The IPO feature bypasses the receiver RF preamplifier, thereby eliminating the preamp’sgain. This feature is not available on the 144 MHz and 430 MHz.1. Press the key momentarily, then rotate the knob, as needed, until OperatingFunction Row 7 [IPO, ATT, NAR] appears on the display.2. Press the (IPO) key to bypass the receiver input preamplifier. The “” icon willappear at the right of the “IPO” indication.3. Press the (IPO) key once more to re-activate the preamp.On the bands below 14 MHz, the input preamplifier is rarely necessary, and acti-vation of the IPO feature will provide substantial protection against intermodulationand other problems associated with strong signal input to the receiver. Rule of thumb: solong as the S-meter is moving on background noise, additional front-end gain is notnecessary.RECEIVER ACCESSORIES