Yaesu FT-950 Operating Manual

Also see for FT-950: Brochure & specs Reference Manual Update Update

Page 53FT-950 O PERATING M ANUALRF GAIN (SSB/CW/AM MODES)The RF Gain control provides manual adjustment of the gain levels for the receiver RF and IF stages, to account for noiseand signal strength conditions at the moment.1. The [RF GAIN] knob should, initially, be rotated tothe fully clockwise position. This is the point of maxi-mum sensitivity.2. Counter-clockwise rotation of the [RF GAIN] knobwill gradually reduce the system gain.ADVICE: As the [RF GAIN] knob is rotated counterclockwiseto reduce the gain, the S-meter reading will rise. Thisindicates that the AGC voltage being applied to thereceiver is increasing (which causes a reduction in re-ceiver gain). Rotating the [RF GAIN] knob control to the fullycounter-clockwise position will essentially disable thereceiver, as the gain will be greatly reduced. In thiscase, the S-meter will appear to be “pegged” againstthe right edge of the analog S-meter scale.Q UICK POINT: Reception frequently can be optimized by rotating the[RF GAIN] knob slightly counter-clockwise to thepoint where the “stationary” meter indication is set justabout the same as the incoming noise level. This set-ting ensures that excessive gain is not being utilized,without so much gain reduction that incoming signalscannot be heard. The RF Gain control, along with the IPO and the At-tenuator features, all affect the system receiver gain indifferent ways. The IPO generally should be the firstfeature engaged when dealing with a high noise level,or a crowded, high-level signal environment, the IPOgenerally should be the first feature engaged, if the fre-quency is low enough to allow the preamplifier to bebypassed. Thereafter, the RF Gain and Attenuator fea-tures may be employed to provide precise, delicateadjustment of the receiver gain to fully optimize per-formance.[RF GAIN] KnobI NTERFERENCE R EJECTION