User manual YAESU FT DX 9000D

[. . . ] FTDX9000D Operation Manual GENERAL DESCRIPTION We wish to take this opportunity to thank you for your purchase of the FT DX 9000D Transceiver!But it also is the product of our company's fifty years of engineering, design, and manufacturing know how. As pioneers in the development of SSB, we have led the technological advances in Amateur Radio communications over the last half century. And now, with the introduction of the FT DX 9000D, we again lead the way with a no-compromise 21st-century design that will make your operating dreams come true. [. . . ] The LED imbedded in the switch will turn off, confirming that the IF Notch filter is no longer operating. Press the Sub (VFO-B) band's RX switch (# ) to engage Dual Receive operation. The LED imbedded in the switch will glow Orange to confirm that the IF Notch filter has been engaged. Rotate the Sub (VFO-B) band's NOTCH knob (# ) to null out the interfering carrier. To switch the IF Notch filter off, press the Sub (VFO-B) band's NOTCH switch once more. The LED imbedded in the switch will turn off, confirming that the IF Notch filter is no longer operating. Advice H The effect of the IF Notch filter may be observed on the Audio Scope of the TFT (on the "Oscilloscope" page). The Notch will be observed as a "dip" in the noise platform observed. What's more, the "Waterfall" display may be used to observe the effect of the IF Notch filter, which will appear as a white area in the colored background area. The tuning rate for the IF Notch is somewhat slow, allowing precise adjustment, so the use of the Waterfall display to confirm proper adjustment is highly recommended. H The width of the IF Notch null may be adjusted using Menu Item "RX DSP 082 IF-NOTCH-WIDTH. " Both "Wide" and "Narrow" selections are available, with "Narrow" providing the least disruption of the "desired" signal. H Under the frequency display, you may also use the Bar Display to show the position of the IF Notch. Use Menu Item "DISPLAY 016 BAR DISPLAY SELECT" to engage this function. MAIN(VFO-A) NTCH switch MAIN(VFO-A) NTCH knob SUB(VFO-B) NTCH knob SUB(VFO-B) NTCH switch SUB(VFO-B) RX switch MAIN (VFO-A) SUB (VFO-B) Note When the NOTCH switch is pressed and held in for two seconds, the center of the notch action will be reset to the positions described below (mode-sensitive): SSB/AM: The Notch will center at 1. 5 kHz (center of the receiver passband). CW: The Notch will center on the frequency programmed by the PITCH knob (# ). The performance of the IF Notch filter is shown in Figure (A), where the effect of rotation of the NOTCH knob is depicted. In Figure (B) you can see the notching effect of the IF Notch filter as you rotate the NOTCH knob to eliminate the incoming interference. A NOTCH QRM (Heterodyne) B Desired Signal IF BANDWIDTH IF BANDWIDTH FT DX 9000D OPERATION MANUAL Page 71 INTERFERENCE REJECTION (SIGNALS WITHIN 3 KHZ) DIGITAL NOISE REDUCTION (DNR) OPERATION The Digital Noise Reduction (DNR) system is designed to reduce the level of random noise found on the HF and 50 MHz bands, and it is especially effective during SSB operation. By rotating the DNR knob, any of sixteen different noisereduction algorithms can be selected; each of these algorithms was create for dealing with a different noise profile, and you will want to experiment with the DNR system to find the best setting according to the noise currently being experienced. The LED imbedded in the switch will glow Red, confirming that the DNR system is engaged. Rotate the Main (VFO-A) band's DNR knob (# ) to select the setting that most effectively reduces the noise level. To disable the DNR system, press the Main (VFO-A) band's DNR switch once more. The imbedded LED will turn off, confirming that the DNR system is not active. [. . . ] Available Values: 1 ~ 10 Default Setting: 10 FTDX9000D OPERATION MANUAL Page 145 MENU MODE TX GNRL GROUP 154. Available Values: SIMP/DUP Default Setting: SIMP When this menu is set to "DUP, " you may receive on the sub band (VFO-B) frequency while transmitting, during dual receive operation, on a different band on the main band (VFO-A). 155. Available Values: ALL MODE/CARRIER Default Setting: ALL MODE ALL MODE: The RF PWR knob is enabled on all modes. In this configuration, the SSB output power will be set to maximum, regardless of the RF PWR knob's position. 159. [. . . ]