The 32-bit floating point DSP has excellent calculation performance, which processes complex and sophisticated algorithms. This allows the DSP to attenuate noise without delay and extracts noise-level signals. It is possible to vary the suppression level in 16 stages. A newly designed noise blanker provides significant reduction of pulse-type noise. The noise blanker allows the operator to change the threshold level as well as blank time parameter and attenuation level. When the IF filter passband is reduced to 500Hz or less in SSB mode or SSB-data mode, special band pass filters (BPF) are automatically selected. The BPF automatically sharpens for better rejection of interfering signals like a CW filter. Along with the BPF setting, the IC-7800 enables the 1/4-tuning step function for easier operation. Antenna memory setting screen The IC-7800 has 4 antenna ports (ANT1 to ANT4) with an automatic antenna selector. Once you program the operating band to the antenna port set mode, the antenna port is automatically selected as you change the operating band. Each antenna port can be set to the antenna usage type such as for Tx/Rx use, Rx only use and off line. The antenna switch button allows you to change an antenna port temporarily. With the push of a band button, the band stacking register allows you to simply bring back the last three operating settings (including antenna port) per band for simple recall. This function is convenient when you operate 3 modes such as SSB, CW and RTTY on one band. The IC-7800's memory keyer has 4 channels with 70 characters for CW, 8 channels with 70 characters for RTTY and 8 channels with 70 characters for PSK 31 operation. The memory keyer is convenient for programming station information, calling CQ and call sign for a DX-pedition or contest. Also, the CW memory keyer has other time saving functions such as automatic repeat, serial contest number auto-counter, and morse cut number functions. [Antenna line] High speed automatic antenna tuner covers HF and 50MHz bands BNC type Rx In/Out connectors for receiver antenna or external attenuator [Receiver] General coverage receiver covers from 30kHz to 60MHz     (* Some frequency bands are not guaranteed., Depends on version.) Two types of receive preamplifiers:     Preamp 1; Boost low level signal improving intermodulation characteristics     Preamp 2; Boost low level signal improving receiver gain 7-step attenuator (3/6/9/12/18/21dB and OFF) Twin peak audio filter for RTTY operation [Transmitter] Low distortion RF speech compressor Tx monitor 50 CTCSS tone encoder and decoder VOX capability (Voice operated transmission) All mode power control [CW] DSP controlled CW keying waveform shaping Multi-function electronic keyer with adjustable keying speed, dot-dash ratio and paddle polarity CW pitch control from 300 to 900Hz The normal (default) CW carrier point is selectable from USB and LSB mode. Double key jack system Full break-in function Frequency lock function for split operation CW/AM auto tuning function [Operation] Set mode function for flexible and speedy setting Memory pad stores up to 5 or 10 operating frequencies Quick split function Quick dualwatch SSB/CW synchronous tuning Single knob control from squelch volume to RF gain RIT and Tx variable up to 9.999kHz UTC/Local Clock and timer function 1Hz pitch tuning and indication 101 memory channels with 10-character comment Built-in voice synthesizer announces operating frequency, mode and receiving signal strength. Programmed scan, memory scan, select memory scan, VSC scan and F scan Auto tuning step function Dial lock Main dial tension control Band edge beep CI-V interface capability Optical digital input/output BNC type Transverter connector External speaker connectors for main and sub receiver