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Sandor, KG4FET, has had good success using the FT100 for PSK31 and recommends
using the USB mode (not RTTY mode). Playing around with RTTY or AFSK mode
settings on the FT100 will only cause confusion. Sandor also used 1:1 600-ohm isolation
transformers on the TX and RX lines as well as an opto-isolator for the PTT.
Problems with FT100 radios
Several owners of the early FT100 radios experienced failures of the V/U output
transistor. The word from Yaesu was that solder flux left on the board was to blame.
Another common issue is related to the Intermittent High SWR ICON problem discussed
elsewhere in this document. Overheating on V/U receive was also an issue on units
manufactured prior to 2001 and can be fixed with a thermal sensor modification that
Yaesu has applied as a retrofit. The ATAS100 antennas seemed to have a rash of early
failures where they refused to move after a while. This appears to have been corrected
with a new H bridge that drives the motor.
Repeater Offsets
The repeater offsets are determined by the values set in menu items 40-43. If you need to
program a memory that has a non-standard offset, use the DUP memories since the
repeater offset is not stored with the other parameters in the standard memory locations
(1-300).
Frank, PA4FR, adds this information as an alternative to using DUP memories: FT-100
ARS (automatic repeater shift) might be activated for 2m and 70 CM bands separately.
ARS is default enabled for both bands. When ARS is enabled, any (!!) manual change to
repeater offset or repeater on/off setting is overridden when you change the channel. The
is actually logical, since ARS defines a certain repeater offset and a certain set of repeater
channels (band-plan). Any changes that violate these ARS settings are "reset" when
changing channel. This is especially confusing in Europe, where the 70CM repeater
band-plan differs per country and therefore the "pre-programmed" repeater band-plan
often is not correct.
The solution: knowing this "strategy" behind ARS operation makes figuring out a
solution very simple: just disable ARS (most likely on 70CM only). Then set one of the
VFOs into the 70CM repeater band and enable repeater shift. YES: repeater shift setting
will be stored with 70CM VFO setting and will remain active when changing channels.
Such a channel can be stored into memory and repeater shift and offset will be stored
with it. (Note that the repeater-shift on/off setting is tied to the VFO and band, just as it is
with other settings like APO)
So, it's not a firmware bug, it's a feature - it's meant to be like this.
RF Exposure
Because the antenna is so close to the occupants of the vehicle with a mobile rig, some
owners have expressed concern about whether or not the installation of the ATAS100
would comply with the FCC's guidelines on RF exposure. I had my ATAS mounted on
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...