User manual YAESU FTDX9000D DATA MANAGEMENT OPERATION MANUAL

[. . . ] FTDX9000D Operation Manual GENERAL DESCRIPTION We wish to take this opportunity to thank you for your purchase of the FT DX 9000D Transceiver!The FT DX 9000D is the culmination of a four-year design project. 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. [. . . ] 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. ERMINOLOGY 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. ADVICE When a received signal becomes degraded due to pulse type noise, you may improve signal readability by setting the AGC HOLD TIME in Menu Items AGC 002, AGC 004, AGC 006, AGC 008, AGC 010, and AGC 012 to "0 msec". FT DX 9000D OPERATION MANUAL Page 81 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 9000D, 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. [MAIN Tuning Dial] knob [CLAR/VFO-B] knob [MNU] key Using Sloped AGC 1. To the bottom right side of the TFT, press the [MNU] (Menu) key momentarily to enter the Menu mode; the Menu will appear on the TFT. Use the [Main Tuning Dial] knob to select Menu Item "RX AUDIO 083 AGC-SLOPE. " 3. 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 will now be using the Sloped AGC system. Audio Output SLOPE NORMAL Input Signal Page 82 FT DX 9000D 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. The Mute feature makes this simple to accomplish. MAIN (VFO-A) [RX] switch Press the Main band's (VFO-A) [RX] LED/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. SUB (VFO-B) [AFL] switch MAIN (VFO-A) [AFL] switch SUB (VFO-B) [RX] switch Main (VFO-A) Band AFL Setup Press the Main band's (VFO-A) [AFL] switch to turn on the Audio Limiter. The imbedded LED in the button will glow red. 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. Sub (VFO-B) Band AFL Setup 1. Press the Sub band's (VFO-B) [RX] switch to engage Dual Receive operation. Press the Sub band's (VFO-B) [AFL] switch to turn on the Audio Limiter. The imbedded LED in the button will glow red. To disable the Audio limiter, press the [AFL] switch once more; the imbedded LED will turn off. FT DX 9000D OPERATION MANUAL Page 83 TOOLS FOR COMFORTABLE AND EFFECTIVE RECEPTION ADJACENT CHANNEL MONITOR (ACM) CW MODE ONLY While operating on CW on the Main band (VFO-A), 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 9000D). 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 band (VFO-B) is not possible while ACM it turned on. [ACM] switch To activate the Adjacent Channel Monitor, press the [ACM] switch. [. . . ] DATA: The VOX function will be activated by data audio input. 175. EXT AMP TX-GND Function: Enables/Disables the TX GND jack on the rear panel. Available Values: ENABLE/DISABLE Default Setting: DISABLE 179. EMERGENCY FREQ TX Function: Enables Tx/Rx operation on the Alaska Emergency Channel, 5167. 5 kHz. [. . . ]