User manual ICOM IC-756 PROII

[. . . ] The AGC voltages detected in front of and behind the digital IF filter in the DSP unit. The first AGC loop prevents saturation of the 1st IF amplifier. The other AGC loop detects the AGC voltage at the 2nd mixer Image rejection mixer IF AMP IF AMP 90° Phase shifter IF AMP IF AMP 90° Phase shifter AGC DET D/A AGC DET A/D DSP unit AMP BPF AMP AGC Loop line +40dBm Audio output level [dB] 50 40 30 20 10 0 DIGI-SEL unit DIGI-SEL Characteristics in the 14MHz band DL ­30. 0dBm REF 0. 0dBm MKR 14. 16MHz 10dB/ ­8. 73dBm B_Blank Norm *A_Write Norm 0dB Dynamic range 110dB MARKER 14. 16MHz digital IF filter output which has only passed the intended signal and draws the full potential from the digital IF filter. Combining the digital IF filter, manual notch, and the 1st IF stage, these are all controlled by the DSP unit. [. . . ] (FM mode is fixed to 15kHz. ) Filter preset screen. shaping (sharp or soft), filter bandwidth, and center frequency characteristics, without missing the action. Multiple filter memories store the last used filter settings by using operation mode. This allows the operator to quickly switch filters for constant operating conditions, such as in a contest. Icom's digital IF filters give you performance that is not possible with crystal or mechanical filters. The image rejection mixer for the 2nd stage reduces signal distortion through IF processing and provides a high-fidelity signal to the DSP unit. This system provides wide dynamic range, reducing the distortion from strong signals and lower intermodulation. Digital twin PBT (Passband Tuning) Once the IF filters have been "tweaked", the operator has additional control with the digital twin PassBand Tuning (PBT). The digital twin PBT Digital manual notch filter In recent years, HF operators have marveled at how well DSP reduces interfering signals and noise. Signals such as heterodynes and AM Carriers can be eliminated with Automatic Notch filter technology. Making interference from RF sources such as beat signals and RTTY signals is a thing of the past. Additionally, the filter shape of the Manual Notch can be adjusted in three steps, with more than 70dB of attenuation! [dB] 10 0 ­10 ­20 ­30 ­40 ­50 ­60 ­70 ­80 ­90 ­100 ­800 ­600 ­400 ­200 0 200 400 600 800 [Hz] Variable level noise reduction The 32-bit DSP processing power of the IC-756 PROII produces real results by separating a signal component from the noise with the variable noise reduction. By suppressing the noise components, an outstanding signal-tonoise ratio is achieved, providing clean, clear audio in all modes without distortion of the target signal. improves the receiver sensitivity by reducing intermodulation characteristics, enabling weak signal work without distortion or interference from strong signals in the band. Quad processing The IC-756 PROII incorporates four independent, 32bit floating DSP units and 24-bit AD/DA converters. They provide a powerful 200W output power at full duty cycle and low transmit intermodulation. An effective cooling system maintains internal temperatures within a safe range and prevents thermal runaway. Microphone equalizer One of the four 32-Bit DSP units is used for adjusting the transmit audio. Digitally tweak your transmit audio with the separate bass and treble controls for incredible sounding audio. This built-in audio equalizer has a total of 121 combinations for each phone mode, so you can master the warm, full audio you want. In addition to the equalizer, a new parametric transmit bandwidth for the SSB mode allows the operator to set both the high- and low-pass filter limits. (100, 300, 500 for the high-pass and 2. 5, 2. 7, and 2. 9 kHz for the low-pass). Then store the filter settings into the PA unit and heat sink Bar type meter three bandwidth memories. The operator may now go from DX to rag chew audio with the push of a button. PA unit (close up) Edge width meter RF speech compressor The IC-756 PROII utilizes the 32-bit DSP for the RF speech compressor providing the maximum punch without the fuzzy sound. It's great for breaking through the noise and hash to complete the QSO. Multi-function meter CF memory card Making big scores means keeping your team fresh on those long DX-peditions or Multi Op contests. Swapping out operators usually involves time-wasting radio tweaks, because each operator has their own favorite settings to best match their operating style. This all changes Memory list screen (Wide setting) and an S-meter connector for an external analog S-meter. RTTY/PSK31 operation without PC connection Another amateur radio first is the capability of receiving and transmitting RTTY and PSK31 without the aid of a computer. [. . . ] Version Rx 0. 030­ 60. 000MHz*2 Tx 1. 800­ 1. 999MHz*2 3. 500­ 3. 999MHz 5. 3305, 5. 3465, 5. 3665, 5. 3715, 5. 4035MHz*3 7. 000­ 7. 300MHz 10. 100­10. 150MHz 14. 000­ 14. 350MHz 18. 068­18. 168MHz 21. 000­ 21. 450MHz 24. 890­24. 499MHz 28. 000­ 29. 700MHz 50. 000­54. 000MHz Europe Version Rx 0. 030­ 60. 000MHz*2 Tx 0. 1357­ 0. 1378MHz 1. 800­ 1. 999MHz 3. 400­ 4. 099MHz*2 6. 900­ 7. 499MHz*2 9. 900­ 10. 499MHz*2 13. 900­14. 499MHz*2 17. 900­ 18. 499MHz*2 20. 900­21. 499MHz*2 24. 400­ 25. 099MHz*2 28. 000­29. 999MHz*2 50. 000­ 54. 000MHz*2 *1 Frequency ranges vary depending on version. *2 Some frequency ranges are not guaranteed. *3 Carrier point frequency. TRANSCEIVER · Output power (continuously adjustable) : SSB, CW, RTTY, PSK31, FM 5­200W AM 5­50W 137kHz, CW* More than ­20dBm (* Depending on version. ) FM (BW: 15kHz at 12dB SINAD) 28­29. 999MHz 0. 5µV*1 50. 0­54. 0MHz 0. 32µV*2 *1 Pre-amp 1 is ON, *2 Pre-amp 2 is ON. · Modulation system SSB AM FM · Spurious emission : DPSN modulation Digital low power modulation Digital phase modulation : More than 60dB (HF bands) More than 70dB (50MHz band) · Carrier suppression : More than 63dB · Unwanted sideband suppression: More than 80dB · TX variable range : ±9. 999kHz · Microphone impedance : 600 (8-pin connector) · Mode : USB, LSB, CW, RTTY, PSK31, AM, FM · Number of channels : 101 (99 regular, 2 scan edges) · Antenna impedance : 50 unbalanced (Tuner off) · Antenna connector : SO-239×4 and BNC×2 · Power supply requirement: 85­265V AC · Temperature range : 0°C to +50°C; +32°F to +122°F · Frequency stability : Less than ±0. 05ppm (0°C to +50°C, after warm up) · Frequency resolution : 1Hz (minimum) · Power consumption : Tx Max. power 800VA Rx Stand-by 200VA (typ. ) Max. 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