Yaesu FT-857 Operation Manual

Also see for FT-857 series: Manual Technical supplement Brochure & specs Operating manual Technical supplement

Contents

Yaesu FT-857 Operation Manual Manual pdf 50 page image

48 FT-857 Operating ManualSSB/AM TRANSMISSIONBasic Setup/Operation1. Press the [MODE(t)] or [MODE(u)] key so as to select either SSB (LSB/USB) or theAM mode. In the SSB mode, if you are operating on the 7 MHz or lower bands, selectthe LSB mode. If you are operating on the 14 MHz or higher bands, select the USBmode.2. Press the [FUNC] key momentarily, then rotate the SELECT knob, as needed, untilMulti Function Row “i” [MTR, PWR, DISP] appears on the display.3. Now press the [A](MTR) or [B] key to select the “ALC” meter function (“ALC” willappear above the [B] key). You may need to press the [A] or [B] key multiple times, asyou will be toggling through several selections.4. Press the microphone’s PTT switch, and speak into the microphone in a normal voicelevel while watching the meter. The ideal audio input level to the transmitter from themicrophone will cause a few “segments” of indication on the ALC meter. Release thePTT switch to return to receive mode.5. If the ALC meter is too high, or too low, you may need to reset the Microphone Gain:ü Press and hold in the [FUNC] key for one second to enter the Menu mode.ü Rotate the SELECT knob to recall Menu Mode No-081 [SSB MIC GAIN] (on SSB)or No-005 [AM MIC GAIN] (on AM).ü Close the PTT switch, and while speaking into the microphone rotate the DIAL untilthe proper ALC indication is achieved on voice peaks.ü When done, press and hold in the [FUNC] key for one second to save the new settingfor the Microphone Gain.1) The AM carrier level is preset to 25 Watts during alignment at the factory, andshould not require further adjustment. It is important to remember that AM trans-mission requires that power must be distributed among the carrier and voice sidebands;therefore, if excessive carrier power is used, there will be insufficient power available forthe information-carrying voice sidebands.2) The [TONE] switch on the back of the MH-31A8J microphone provides adjustment ofthe microphone’s frequency response. Setting this switch to the “2” position will roll offsome of the bass response, resulting in improved “talk power” in many instances. The“1” position is primarily used in countries like Japan, where vowel sounds are of criticalimportance in conveying information; in Western languages, consonant sounds (whichare rich in high-frequency components) are frequently more important.TRANSMITTER OPERATION