20
After the factory mod.
The SWR icon with an 'X' next to it indicates that the SWR is out of range. If you see an
SWR icon with an 'O' next to it flash momentarily, it is an indication that the antenna has
finished tuning and the SWR is 'OK'.
Thermal modification
The cooling fans will only work during transmission when the radio is tuned to 70.500
MHz or higher. Yaesu will fix this by mounting a thermal switch that bypasses the
electronic fan control circuit. The thermal mod is done on an 'as requested' basis since
Yaesu feels that keeping the fans off in V/U receive poses no threat of overheating the
radio.
A simpler way to do it yourself is to add a 50 to 120 ohm / 1 Watt resistor between one of
the black wires of the fans and ground, for instance the chassis. The resistor value will
determine the idle speed of the fans. Pick one that suits your preferences.
The pictures below show the Yaesu factory modification:
Summary of Contents for FT-100 Micro Mobile
Page 1: ...Yaesu FT 100 undocumented Compiled by PA3GMP Printed 4 April 2004...
Page 10: ...9 ATAS 100 Disassembly...
Page 11: ...10...
Page 12: ...11...
Page 13: ...12...
Page 20: ...19 After the factory mod...
Page 22: ...21 Prior to modification...
Page 23: ...22 Prior to modification...
Page 24: ...23 After modification...
Page 37: ...36...
Page 46: ...45 FT100 menu settings Entry Set to Description Remarks...
Page 47: ...46 FT100 menu settings Entry Set to Description Remarks...
Page 48: ...47 FT100 menu settings Entry Set to Description Remarks...
Page 49: ...48 FT100 menu settings Entry Set to Description Remarks...
Page 50: ...49 FT100 menu settings Entry Set to Description Remarks...
Page 51: ...50 Frequency list Freq Mode Memory Description...
Page 52: ...51 Frequency list Freq Mode Memory Description...
Page 53: ...52 Frequency list Freq Mode Memory Description...
Page 54: ...53 Frequency list Freq Mode Memory Description...
Page 55: ...54 Frequency list Freq Mode Memory Description...