Furuno FAR-2107 Series Service Manual page 292

4.4.10 PM GAIN ADJ
INITIALIZE -> 4: INSTALLATION -> 0
The performance monitor function allows checking for the reduction of transmission
output, and reception sensitivity. Make adjustment of PM GAIN ADJ at the time of
installing, and when Magnetron or RF unit is replaced.
1. Procedure for adjustment
1. Select "[INITIALIZE] -> [INSTALLATION] -> 0. PM GAIN ADJ"
Note: When " 0. PM GAIN ADJ " is selected, the following items are
automatically set up.
- RANGE: 24 NM
- PULSE: LONG
- ES: OFF
- EAV: OFF
2. Adjust [GAIN] VR so as to allow a small amount of noise. The gain at that time is
approximately "70".
3. Adjust the PM gain by rotaging the wheel of the track ball so as to allow a slight
amount of the second ring. Numerical input (0 to 255) from the keyboard can also be
accepted for the PM GAIN. "255" is the maximum attenuation level (i.e. lowest
video input levels.)
- AUTO FTC: OFF
- IR: 2
- STC: 0 （STC VR Disabled）
- FTC: 0 （FTC VR Disabled）
First ring
Make adjustment so as to allow a slight
amount of the second ring.
Fig. 4.4.9 PM Adjustment
4-28
- BLIND SECTOR: OFF
- TUNE: AUTO
Noise Level
No.1 Ring Echo
4.4 Initialize Setting
10dB
No.2 Ring Echo