Icom IC-7600 Instruction Manual - Page 11
P.amp Switch P.amp, Bk-in Switch Bk-in - preamp 2
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1 PANEL DESCRIPTION MF3 (MULTI-FUNCTION 3 SWITCH) P.AMP SWITCH (P.AMP) (p. 72) ➥ Selects one of 2 receive RF preamps or bypasses them. • "P. AMP1" activates 10 dB preamp. • "P. AMP2" activates 16 dB high-gain pre- amp. • "P. AMP OFF" can also be selected. ➥ Turns the preamp function OFF when pushed and held for 1 sec. ✔ What is the preamp? The preamp amplifies signals in the front end to improve S/N ratio and sensitivity. Select "P. AMP1" or "P. AMP2" when receiving weak signals. MF4 (MULTI-FUNCTION 4 SWITCH) ATT SWITCH (ATT) (p. 72) ➥ Selects 6 dB, 12 dB or 18 dB attenuator when pushed. • "ATT OFF" can also be selected. ➥ Turns the attenuator function OFF when pushed and held for 1 sec. ✔ What is the attenuator? The attenuator prevents a desired signal from being distorted when very strong signals are near the desired frequency, or when very strong electromagnetic fields, such as from a broadcasting station, are near your location. MF5 (MULTI-FUNCTION 5 SWITCH) AGC SWITCH (AGC) (p. 74) ➥ Activates and selects fast, middle or slow AGC time constant when pushed. • In FM mode, only "FAST" is available. ➥ Enters the AGC set mode when pushed and held for 1 sec. AGC time constant can be set between 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 condition. MF6 (MULTI-FUNCTION 6 SWITCH) VOX SWITCH (VOX) (p. 84) ➥ Push to turn the VOX function ON and OFF during SSB, AM and FM mode operation. ➥ Push and hold for 1 sec. to enter VOX set mode. ✔ What is the VOX function? The VOX function (voice operated transmission) activates transmission without pushing the transmit switch or PTT switch when you speak into the 1 microphone; then automatically returns to receive when you stop speaking. 2 BK-IN SWITCH (BK-IN) (p. 85) 3 ➥ Selects semi break-in, full break-in operation, or turns the break-in opera- 4 tion OFF when pushed in CW mode. ✔ What is the break-in function? 5 The break-in function switches transmit and receive with CW keying. Full break-in function (QSK) 6 can monitor the receive signal during keying. 7 MF7 (MULTI-FUNCTION 7 SWITCH) COMP SWITCH (COMP) (p. 86) 8 ➥ Turns the speech compressor ON and OFF in SSB mode. 9 ➥ Switches the narrow, middle or wide compression when pushed and held 10 for 1 sec. ✔ What is the speech compressor? 11 The speech compressor compresses the trans- mitter audio input to increase the average audio 12 output level, to increase talk power. This function is effective for long-distance communication or when 13 propagation conditions are poor. 14 1⁄4 SWITCH (1⁄4) (p. 30) ➥ Turns the 1⁄4 speed tuning function 15 ON and OFF in SSB data, CW, RTTY and PSK modes. • 1⁄4 function sets dial rotation to 1⁄4 of 16 normal speed for fine tuning. 17 TONE SWITCH (TONE) (pgs. 62, 63) ➥ Switches between the tone encoder, 18 tone squelch function and no-tone op- eration when pushed in FM mode. ➥ E n t e r s t h e t o n e s e t m o d e w h e n 19 pushed and held for 1 sec. in FM mode. 20 21