User manual YAESU FTDX-9000MP

[. . . ] FT DX 9000MP Operation Manual GENERAL DESCRIPTION We wish to take this opportunity to thank you for your purchase of the FT DX 9000MP 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 9000MP, we again lead the way with a no-compromise 21st-century design that will make your operating dreams come true. [. . . ] Additionally, you will likely encounter distortion on stronger signals, as the IF ampligiers and the following stages are probably being overloaded. Quick Point Several spects of AGC performance may be configured via the Menu. However, because AGC can have such a profound impact on overall receiver performance, we generally do not recommend any changes to the AGC Menu selections. Terminology Automatic Gain Control, or AGC, is a circuit that senses the incoming signal strength, and then limits the gains of the RF and IF stages so as to keep the output audio volume at a more-or-less constant level. AGC also protects the RF, IF, Audio, and DSP stages from overload, as it limits the signal strength that is allowed to flow, irrespective of the input signal level. FTDX9000MP OPERATION MANUAL Page 77 TOOLS FOR COMFORTABLE AND EFFECTIVE RECEPTION AGC (AUTOMATIC GAIN CONTROL) SLOPED AGC Operation In traditional AGC systems, the audio output from the transceiver becomes essentially fixed once the threshold for AGC action is reached (usually several dozen dB above the no-signal noise floor). The FT DX 9000MP, however, includes an innovative Sloped AGC system, that allows the audio volume to rise and fall slightly according to signal strength. Although the rise/fall are not dramatic, they are sufficient to allow you to use your ear to discern and separate signals according to signal strength, not just audio frequency. Press the MNU (Menu) key (# ) momentarily to enter the Menu mode; the Menu will appear on the LCD display. Use the Main Tuning Dial knob (# ) to select Menu Item [RX AUDIO 075 AGC-SLOPE]. Rotate the CLAR/VFO-B knob (# ) to change the setting to "SLOPE. " 4. Press and hold in the MNU key for two seconds to save the new setting and exit to normal operation. You wil now be using the Sloped AGC system. Audio Output SLOPE NORMAL Input Signal MNU Key MAIN Tuning Dial Knob CLAR/VFO-B Knob Page 78 FTDX9000MP OPERATION MANUAL TOOLS FOR COMFORTABLE AND EFFECTIVE RECEPTION MUTE FEATURE MAIN (VFO-A) BAND There may be occasions, during Dual Receive operation, when you want to silence the Main (VFO-A) receiver temporarily so as to concentrate on what's being received on the Sub (VFO-B) receiver. Press the Main (VFO-A) band's RX LED/switch (# ). MAIN(VFO-A) RX switch The Main (VFO-A) receiver will be silenced, and the green LED in the RX switch will blink. To restore reception on the Main (VFO-A) receiver, just press the blinking RX switch/LED once more. AUDIO LIMITER (AFL) FEATURE Particularly when the AGC is off, you may desire to limit the level of audio output that is permitted to flow to the speaker or earphones. For these circumstances, the AFL (Audio Limiter) feature will provide the desired cap on the audio output. Main (VFO-A) Band AFL Setup Press the Main (VFO-A) band's AFL switch (# ) to turn on the Audio Limiter. To disable the Audio limiter, press the AFL switch once more; the imbedded LED will turn off. Advice Because the AFL feature will generally reduce the overall audio level, we recommend that it be left Off unless special operating conditions warrant its use. Press the Sub (VFO-B) band's RX switch (# ) to engage Dual Receive operation. Press the Sub (VFO-B) band's AFL switch (# ) to turn on the Audio Limiter. To disable the Audio limiter, press the AFL switch once more; the imbedded LED will turn off. SUB(VFO-B) AFL Switch MAIN(VFO-A) AFL Switch SUB (VFO-B) MAIN (VFO-A) FTDX9000MP OPERATION MANUAL Page 79 TOOLS FOR COMFORTABLE AND EFFECTIVE RECEPTION ADJACENT CHANNEL MONITOR (ACM) CW MODE ONLY While operating on CW on the Main (VFO-A) band, the ACM feature provides a visual indicator of encroachment by another station (someone you may not be able to hear because of the tight DSP filter in your FT DX 9000MP). The presence of a nearby strong signal will be displayed on the Sub-receiver's S-meter. The Sub (VFO-B) receiver is taken over by the ACM, when engaged, and reception on the Sub (VFO-B) band is not possible while ACM it turned on. [. . . ] Pressing this key selects the "General Coverage" VFO register, for reception outside the Amateur bands. Pressing this key momentarily engages the "direct frequency entry" mode of operation, whereby the keys described in the (A) and (B) sections above are used for directly programming the operating frequency. Once the frequency has been successfully entered, press the ENT key once more to exit to the newlyselected frequency. For entering a frequency directly into the Sub (VFOB) band register, press this key. Then use the keys described in sections (A) and (B) above for entering the digits of the desired frequency; when done, press the V-B key once more to lock the newly- selected frequency into the Sub (VFO-B) band register. [. . . ]