Icom IC-7100 Instruction Manual - Page 51

3 BASIC OPERATION Squelch and receive (RF) sensitivity Adjusts the RF gain and squelch threshold level. The squelch removes noise output to the speaker when no signal is received (closed squelch). • T he squelch is particularly effective for AM and FM, but also works in other modes. • T he 12 to 1 o'clock position is recommended for the most effective use of the [RF/SQL] (L) control. • T he [RF/SQL] (L) control operates as only an RF gain control (Squelch is fixed open), or a squelch control (RF gain is fixed at maximum sensitivity) depending on the "RF/ SQL Control" option in the "Function" Set mode. (p. 6-5) SET > Function > RF/SQL Control The L, R, C or D in the instructions indicate the part of the controller. L: Left side, R: Right side, C: Center bottom D: Display (Touch screen) [RF/SQL] SET MODE OPERATING SETTING MODE [RF/SQL] OPERATION AUTO Operates as only a squelch A M / F M / W F M / control. DV • R F gain is fixed at maxi- mum sensitivity. Operates as only an RF SSB/CW/RTTY gain control. • Squelch is fixed open. SQL ALL Operates as only a squelch control. • R F gain is fixed at maxi- mum sensitivity. RF+SQL (default) FM/DV Operates as an RF gain control, and a noise squelch or S-meter squelch. SSB/CW/RTTY/ AM Operates as an RF gain control, and an S-meter squelch. • When used as an RF gain/squelch control Squelch is open. Noise squelch (FM/DV modes) Recommended level Maximum RF gain RF gain adjustable range S-meter squelch • When used as an RF gain control (Squelch is fixed open; SSB, CW, RTTY only) ❍ Adjusting RF gain (Receive sensitivity) Normally, [RF/SQL] (L) is set to the 12 o'clock position. Rotate [RF/SQL] (L) to the 11 o'clock position for maximum sensitivity. • Rotating counterclockwise from the maximum position re- duces sensitivity. • The S-meter indicates receive sensitivity. While rotating the RF gain control, a faint noise may be heard. This comes from the DSP unit and does not indicate an equipment malfunction. ❍ Adjusting squelch (Removing non-signal noise) Rotate [RF/SQL] (L) clockwise when no signal is received, until the noise just disappears. • The TX/RX LED light goes out. • Rotating [RF/SQL] (L) past the threshold point activates the S-meter squelch- this allows you to set a minimum signal level needed to open the squelch. Adjustable range Minimum RF gain Maximum RF gain • When used as a squelch control (RF gain is fixed at maximum.) Noise squelch (FM/DV modes) Noise squelch threshold (FM/DV modes) S-meter squelch threshold Squelch is open. S-meter squelch Shallow Deep 3-19