Icom IC-R9500 Instruction Manual - Page 15

1 PANEL DESCRIPTION @2 AF CONTROL [AF] (inner control; p. 3-8) Varies the audio output level of the speaker or headphones. Audio output increases Audio output decreases @3 BASS RESPONSE CONTROL [BASS] (outer control; p. 3-9) Adjusts the bass response of the audio output. Bass level increases ➥ Selects the attenuator when pushed. (p. 5-9) • HF bands: 6, 12, 18, 24, 30 dB. • 30-1150 MHz: 10, 20, 30 dB. • 1150-3335 MHz: 20 dB only. ➥ Turns OFF the attenuator when pushed and held for 1 sec. (p. 5-9) ✔ What is the attenuator? The attenuator prevents a desired signal from distorting when very strong signals are near the receiving frequency, or when very strong electric fields, such as from a broadcasting station, are near your location. ➥ Selects one of 3 IF filter settings. ➥ Enters the filter set screen when pushed and held for 1 sec. Bass level decreases @4 TREBLE RESPONSE CONTROL [TREBLE] (inner control; p. 3-9) Adjusts the treble response of the audio output. Treble level increases Treble level decreases @5 MULTIFUNCTION SWITCHES Push to select the functions indicated in the LCD display to the right of these switches. • Functions vary depending on the operating condition. ➥ While operating HF bands, selects the antenna connector from HF ANT 1, HF ANT 2 and HF ANT 3 when pushed. (p. 9-3) • During 30-1150 MHz operation, only ANT 1 is available. • During 1150-3335 MHz operation, only ANT 2 is available. ➥ Turns the antenna control voltage ON and OFF form [ANT SEL] when pushed and held for 1 sec. (p. 9-3) ➥ Selects one of 2 receive RF preamps or bypasses them. (p. 5-9) ● HF bands • "P. AMP1" activates 10 dB preamp. • "P. AMP2" activates high-gain preamp. ● Above 30 MHz bands • Only "P. AMP" is available. ✔ What is the preamp? The preamp amplifies received signals in the front end circuit to improve S/N ratio and sensitivity. Select "P. AMP1" or "P. AMP2" when receiving weak signals. ➥ Activates and selects fast, middle or slow AGC time constant when pushed. (p. 5-10) • In FM, WFM or P25 mode, only "FAST" is available. • "VR (volume)" indicates that AGC time constant depends on [AGC] control. ➥ Enters the AGC set mode when pushed and held for 1 sec. (p. 5-10) AGC time constant can be set from 0.1 to 8.0 sec. (depends on mode), or turned OFF. When AGC is "OFF," the S-meter does not function. ✔ What is the AGC? The AGC controls receiver gain to produce a constant audio output level, even when the received signal strength varies dramatically. Select "FAST" for tuning and then select "MID" or "SLOW" depending on the receiving conditions. ➥ Switches between the tone squelch, DTCS squelch function and no-tone operation when pushed in FM mode. (p. 4-4) ➥ Enters the tone set mode when pushed and held for 1 sec. in FM, FSK mode. (pgs. 4-4, 4-12) ➥ Push to toggle the CW pitch setting screen ON and OFF in CW mode. (p.4-9) (Requires optional UT-122) ➥ Switches the digital squelch between NAC squelch, selective squelch and OFF in P25 mode. (p. 4-19) ➥ Enters the code set mode when pushed and held for 1 sec. in P25 mode. (p. 4-19) ➥ Push to switch the voice squelch control function ON and OFF; useful for scanning. (p. 8-3) 1-5