Yaesu FT-891 Advance Manual

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Contents

35FT-891 Advance ManualTools for Comfortable and Effective ReceptionRF Gain (SSB/CW/AM Modes)The RF Gain control provides manual adjustment of the receiver RF and IF stages gain,to accommodate the noise and signal strength conditions at the moment.1. The [RF/SQL] knob should, initially, be ro-tated clockwise, so that the minimum S-Me-ter indication is not deflected. This is thepoint of maximum sensitivity.2. Counter-clockwise rotation of the [RF/SQL]knob will gradually reduce the RF system gain.r As the [RF/SQL] knob is rotated counterclockwise to reduce the gain, the minimumS-meter reading will rise. This indicates that the AGC voltage being applied to thereceiver is increasing (this causes a reduction in receiver gain).r Rotating the [RF/SQL] knob control to the fully counter-clockwise position willessentially disable the receiver, as the gain will be greatly reduced.r Reception frequently can be optimized by rotating the [RF/SQL] knob slightly counter-clockwise to the point where the “stationary” S-meter indication is set just about thesame as the incoming noise level. This will reduce the RF gain to find a level ofimproved signal to noise ratio.r The RF Gain control, along with the IPO and the Attenuator features, all affectthe system receiver gain in different ways. The IPO generally should be the firstfeature engaged when dealing with a high noise level, or a crowded, high-levelsignal environment. Also, the IPO generally should be the first feature engaged, ifthe frequency is low enough to allow the preamplifier to be bypassed. Thereafter,the RF Gain and Attenuator features may be employed to provide precise, delicateadjustment of the receiver gain to fully optimize performance.ATT (Attenuator)The Attenuator will reduce all signals (and noise) by 12 dB, and it may be used to makereception more pleasant under extremely noisy conditions.1. Press the [F] key repeatedly, to find the“FUNCTION-1” list screen.2. Rotate the MULTI function knob to select“ATT”.3. Press the MULTI function knob.The ATT will turn on.r To set the ATT to “OFF”:1. Press the [F] key repeatedly, to find the“FUNCTION-1” list screen.2. Rotate the MULTI function knob to select “ATT”, then press the MULTI function knob.3. Press and hold the [F] key for one second to exit the “FUNCTION-1” list screenand resume normal operation.r The ATT function may be assigned to the [A], [B] or [C] key. Refer to “Changing thefunction assigned to the [A]/[B]/[C] keys” in the FT-891 Operating Manual.