Icom IC-R75 Instruction Manual

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Icom IC-R75 Instruction Manual Manual pdf 16 page image

514RECEIVE FUNCTIONS Mode selectionThe following modes are available in the IC-R75:SSB (LSB/USB), CW, CW REV (CW reverse), FM,AM, S-AM (Synchronous detection AM), RTTY andRTTY REV (RTTY reverse).➥ Push [SSB] to toggle between LSB and USB.➥ Push [CW/RTTY] momentarily to toggle betweenCW and RTTY.➥ Push [CW/RTTY] for 2 sec. to toggle between CWand CW reverse or RTTY and RTTY reverse.➥ Push [AM] to toggle between AM and S-AM.• “S-” blinks when automatic mode selection betweenS-AM and AM modes is in use. This can be set in setmode. (p. 31)➥ Push [FM] to select FM.The selected mode is indicated in the function dis-play.OPERATING MODE SELECTIONSSBAMPush momentarilyFMCW/RTTYCW CW REV RTTY RTTY REVAMPush mode switchfor 2 sec.Push mode switchmomentarily.S-AMFMLSB USB Squelch and RF gainThe receiver uses the same control, [RF/SQL], to ad-just one of either the RF gain or the squelch.[RF/SQL] adjusts either the RF gain or the squelchdepending on the operating mode selected and thecondition of the RF/SQL item in set mode (p. 30).• [RF/SQL] control priority* The RF gain is set to maximum level when the [RF/SQL]is set as [SQL] control.The RF (Radio Frequency) gain is used to adjust thereceiver gain.• Shallow rotation moves the S-meter to the right indicatingthe signal strength which can be received.The recommended position for RF gain is the 12o’clock position since this sets RF gain to the max.The SQUELCH removes noise output from thespeaker (closed condition) when no signal is re-ceived. The squelch is particularly effective for FM. Itis also available for the other modes.• When operating in FM, first rotate the control fully counter-clockwise. Then, rotate the control clockwise to the pointwhere the noise just disappears. This is the best position.The squelch does not open for weak signals when it is settoo deep.• A segment appears in the S-meter to indicate the S-metersquelch level.• When set as the [RF/SQL] controlSet modesettingUSB, LSB,CW, RTTY AM, S-AM, FMSq (SQL) SQL* SQL*At (AUTO) RF GAIN SQL*rS (RF/SQL) RF/SQL RF/SQLRecommended levelMinimum RF gainAdjustable rangeRF gain adjustablerangeMaximum RF gainMaximum RF gainSquelch is open. S-meter squelchS-meter squelchthresholdNoise squelch threshold(FM mode)Shallow DeepSquelch is open.S-meter squelchNoise squelch (FM mode)Noise squelch (FM mode)• When set as the [SQL] control• When set as the [RF] control