Built-in high-brightness TFT full-color display with touch-panel functionality The FT-991A is equipped with a 3.5 inch full-color TFT display. Functions, including the receiving band, the noise and signal interference reduction tools are graphically displayed. Even while performing rigorous operations, during DX pditions or contests, the operator may instantly grasp the status of each function. Equipped with C4FM digital mode This transceiver C4FM mode provides good error cor- rection performance, and supports the V/D mode (voice/ data simultaneous transmission mode) which makes the transceiver suitable for mobile communication, and the Voice FR mode (voice full rate mode) which allows the transceiver to transmit high quality digital audio. The AMS function recognizes the contacting stations transmission method and automatically switches the transceiver to the same C4FM digital or analog (FM) communications mode as the received signal. DG-ID (Digital Group ID) feature, the Group Monitor (GM) feature enables automatically locating, and communicating with other stations that have the same DG-ID number within contact range. The two-digit DG-ID numbers (00 to 99) can be set separately for Transmit and Receive. By setting both transmit and receive to “00”, communication with all the other stations in the digital C4FM mode is possible, regardless of their DG-ID number setting. Matching the transmit DG-ID number to the uplink DG-ID number set in the DR-2X System Fusion II digital repeater, will permit access to the digital repeater DR-2X used by the club. DP-ID (Digital Personal ID) feature may communicate only by the transceivers registered the individual ID information. Every C4FM digital transmit communication contains the individual ID information (Radio ID) of each transceiver. The DP-ID function uses this individual ID information. When the DP-IDs of the transceiver are registered with each other, they can communicate even if the DG-ID numbers are different. By registering the DP-ID of the transceiver to the DR-2X System Fusion II digital repeater, the digital repeater may be controlled by remote operation. GM (group monitor) function automatically inquires to find if there are any stations with the GM function in operation on the same frequency within communication range. The members may then automatically exchange (send/ receive) station location information. The transceiver automatically checks the channel fre- quency for registered member stations that are within com- municating range. The distance and direction information of the call sign members of the group may be shown on the TFT display. Comes equipped with two types of roofing filters This transceiver is equipped with two types of roofing fil- ters for 3 kHz and 15 kHz bandwidths. These narrow band filters are especially useful on a very crowded band during contests, because they can dramatically attenuate powerful out-of-band signals in the first IF stage and reduce their impact in the second stage to further optimizing the excel- lent dynamic range and IP3 characteristics for processing signals ranging from faint to powerful. Two selectable RF amplifiers provide the optimal receiver gain for each low-to high HF band (see page 48.) Configure the front end RF circuitry for the precise gain and performance to suit the conditions of each HF band.Select the IPO (Intercept Point Optimization) feature to optimize the proximal multi-signal and mutual modulation character- istics in order to minimize the effects of powerful broadcast stations, especially in the low-band so that even the faintest signals can be received. When higher gain is advantageous, select the single low noise RF amplifier AMP1. In the high bands, adding AMP2 provides maximum useful gain. High stability built-in TCXO The 30.225 MHz standard oscillator provides exceptional frequency stability. It is temperature compensated and boasts an enhanced ±0.5 ppm stability from −10°C to +50°C. WIDTH feature and continuously variable bandwidth SHIFT feature. Optimal wide to narrow bandwidth switching (see pages 51, 52.) The SHIFT feature, can eliminate interference in one side of the passband. The WIDTH feature allows the bandwidth to be narrowed by rotating the WIDTH knob. The moment weak signals disappear due to interfering signals (includ- ing pile-ups), you can eliminate the interfering signals and extract only the desired signal, thanks to the unique DSP sharp filtering characteristic. CONTOUR feature is renowned for effective noise control (see page 50.) Rather than using the DSP extremely sharp attenuation characteristics, the CONTOUR circuit provides gentle shaping of the DSP passband filter and can thus attenuate or peak bandwidth components in segments. The interfer- ing signal can be naturally shaped without having part of the signal suddenly interrupted. The contour function is very effective in making the desired signal rise out of the interference. DNR (Digital Noise Reduction) by DSP digital processing (see page 56.) The incorporated digital noise reduction circuit may be set to the optimal working point by varying the 15 step parameters according to the noise type. NOTCH feature that significantly eliminates unwanted beat signals; and DNF feature that instantly attenuates multiple beat signals (see page 56.) When interfering beat signals are present in the receiver passband, the IF NOTCH feature can significantly elimi- nate a part of the passband and remove the beat signal. Moreover, the function is equipped with an Automatic Tracking System DNF (Digital Notch Filter) that can be engaged by DSP when there are multiple interfering signals, even when the frequency is changing. Reliable High-output Final Amplifier Stage In the HF/50MHz frequency range, a pair of RD100HHF1 transistors in a push-pull RF amplifier arrangement deliv- ers 100 watts of low-distortion, high-quality transmitter power. The final amplifier for the 144 MHz/430 MHz bands uses the high-output RDH70HUF2 device, provid- ing ample output power of 50 watts. Microphone Amplifier that includes Parametric Equalizer (see page 65.) The microphone amplifier equalizer feature is equipped with a three-stage parametric equalizer that can alter the Low, Mid, and High frequencies of the audio separately; this feature permits the bandwidth and gain for each part of the audio spectrum to be precisely adjusted independently. Real-Time Spectrum Scope and Multi-Color Waterfall Display (see page 42.) The spectrum scope function provides a visual display of the strength and distribution of signals across the band in real time. The Waterfall Display Mode portrays color dif- ferentiation between strong and weak signals. High speed antenna tuner (see page 63.) The transceiver is equipped with the relay switching high speed digital tuner which supports 1.8 MHz to 50 MHz. The large 100-channel tuning data memory allows im- mediate recall of the optimum matching conditions for previously tuned frequencies. Optional Five Channel Message Memory (voice memory) (see page 70.) You can use the 5 channel voice memory function which is useful for operating in contests, etc. This voice memory enables recording of up to 20 seconds of audio for each message you want to send. Custom selection (C.S) button (see page 39.) This feature lets you select any Menu item for one-touch access via the C.S button.