Icom ic 7800 mods full#

The other AGC loop detects the AGC voltage at the digital IF filter output which has only passed the intended signal and draws the full potential from the digital IF filter. The first AGC loop prevents saturation of the 1st IF amplifier. The AGC voltages detected in front of and behind the digital IF filter in the DSP unit. This system provides wide dynamic range, reducing the distortion from strong signals and lower intermodulation. The image rejection mixer for the 2nd stage reduces signal distortion through IF processing and provides a high-fidelity signal to the DSP unit. The 1st mixer stage is driven with a signal from the high-drive Local Oscillator with excellent C/N. The IC-7800 uses a double conversion system composed of a D-MOS FET 1st mixer and a newly developed image rejection mixer for the 2nd stage. Simple receiver system configuration is the best way to eliminate sources of the spurious signals and distortion from transceivers. The center frequency of the pre-selector is manually adjustable from the DIGI-SEL tuning knob on the front panel. It automatically tracks the intended signal keeping the pre-selectorвЂ™s bandwidth centered on the operating frequency. The pre-selector works between 1.5MHz and 30MHz and rejects distortion components derived from out of band interference such as multi-multi operation or strong broadcast stations. Performance is much better than regular IF filters. * Icom calls the roofing filters вЂњHi-spec 1st IF filtersвЂќ, because their You can select the filter widths from 15kHz, 6kHz and 3kHz, depending on operating mode. Before the 1st amplifi er, the IC-7800's three Hi-Spec 1st IF filters* (roofing filter) adjacent signals. The mechanical relay reduces secondary distortion at the primary stage of signal processing.Д¬ontesters know how frustrating it is to experience a strong adjacent signal that's blocking the receiver from pulling out a weaker signal. The IC-7800 uses durable mechanical relays for BPF switching instead of non-linear semi-conductors, like switching diodes which can cause distortion. This allowed us to explore new technical dimensions. A first in Ham radio! To achieve this superior receiver performance, IcomвЂ™s engineering team completely re-engineered the whole analog circuit and matched it to the DSP units. IcomвЂ™s considerable analog RF circuit experience combined with cutting-edge digital technology results in an astonishing 110dB receiver dynamic range and a +40dBm IP3 in the HF bands. Simply put, Icom has developed the ultimate Amateur HF transceiver. The result is TWO identical receivers with 110dB dynamic range, +40dBm 3rd order intercept point, and unmatched DSP technology in the HF bands something that has never been achieved in Ham radio! The IC-7800 is an artistic fusion of over 40 years analog RF circuit development expertise and cutting-edge digital technology. The IC-7800 will be viewed as the pinnacle radio for years to come. It takes amateur radio to a whole new level of performance.

Some of todayвЂ™s operators still feel the IC-781 is the pinnacle in amateur radio design. The IC-781 set benchmarks back in the 1980вЂ™s as that generationвЂ™s ultimate HF transceiver. The IC-7800вЂ™s somewhat familiar looks will remind many HF operators of the IC-781. Continuing with this tradition, Icom announces the ground-breaking IC-7800! Starting with the first analog PLL circuit in the IC-200 to the ground-breaking 32-bit DSP technology used in the IC-756PRO, IcomвЂ™s developed some of the most innovative radio equipment ever made. Icom is a pioneer in the amateur radio world. Unidades de AlimentaГ§ГЈo e Conversores de TensГЈoДЇrom 40 years of RF design expertise comes.

Icom ic-7800 mods