ICOM 301500 Manuale Utente

9

67

N Optional AT-180 

The AT-180 automatic antenna tuner matches the 
IC-7200 to the connected antenna automatically. 
Once the tuner matches an antenna, the variable 
capacitor settings are memorized as a preset point 
for each frequency range (100 kHz steps). Therefore, 
when you change the frequency range, the variable 
capacitors are automatically preset to the memorized 
point.

 • 

 

The AT-180 can match both HF and 50 MHz 
bands. However, operation is different for the HF 
and 50 MHz bands.

 • 

 

When connecting the AT-180, the IC-7200’s out-
put power must be more than 10 W. Otherwise, 
the AT-180 may not be tuned correctly. (AT-180’s 
minimum operating input power is 8 W.)

 NEVER transmit with the tuner ON 

when no antenna is connected. This will damage 
both the transceiver and antenna tuner.

D Tuner operation

• For the HF band:
Push 

 to turn the tuner ON. The antenna is 

tuned automatically during transmission when the 
antenna SWR is higher than 1.5:1.

• When the tuner is ON, “

” indication appears.

• For the 50 MHz band:
Push and hold 

 for 1 sec. to tune the antenna. 

If 

“

”

 indicator blinks slowly while transmitting, 

push and hold 

 for 1 sec. again to re-tune the 

antenna.

D Manual tuning

During SSB operation on HF bands at low voice lev-
els, the AT-180 may not be tuned correctly. In such 
cases, manual tuning is helpful.

Push and hold 

 for 1 sec. to start manual tun-

ing.

•  When CW mode is selected, a side tone is emitted, and  

“

” indicator blinks; then, the previous mode is se-

lected.

If the tuner cannot reduce the SWR to less than 
1.5:1 after 20 sec. of tuning, 

“

”

 indicator disap-

pears. In this case, check the following:
• the antenna connection and feedline
•  the antenna SWR (p. 30; meter function, p 60; 

Measuring SWR)

Through inhibit (HF bands only)
The AT-180 has a through inhibit condition. When 
selecting this condition, the tuner can be used at 
poor SWR’s. In this case, automatic tuning in the 
HF bands activates only when exceeding SWR 3:1. 
Therefore, manual tuning is necessary each time you 
change the frequency. Although termed “through in-
hibit,” the tuner will be set to the “through”  configura-
tion if the SWR is higher than 3:1 after tuning.

• Tuner  sensitive condition (HF bands only)
If you require critical tuning at any time during trans-
mission, select the tuner sensitive condition. 
See p. 68 for selection.

• Automatic tuner start (HF bands only)
If you want to turn OFF the tuner under conditions 
of VSWR 1.5:1 or less, use “automatic tuner on” and 
turn the tuner OFF. See p. 76 for the automatic tuner 
function.

• PTT tune function (p. 76)
The AT-180 is tuned when [PTT] is pushed after the 
frequency is changed (more than 1%) if the AT-180 is 
turned ON. This function removes the “push and hold 

 

” operation and activates first transmission 

on the new frequency.
This function is turned ON in the set mode.