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must show ENC for the CTCSS tone to go into memory. If the main display does not
show ENC when the frequency is put into memory, the CTCSS setting is not stored.
Duplexers
The ATAS100 is designed to tune on all the bands on which the radio transmits including
2m and 70cm. This requires a duplexer like the Diamond MX62M or the Comet CF706
to connect the VHF/UHF and HF pigtails together. (The actual cross-over
frequency between the pigtails is 70.5Mhz.) However, many people prefer to use a
separate antenna for the VHF/UHF bands since those antennas typically cost about the
same price as a duplexer and usually have some gain whereas the ATAS100 has no gain
on VHF/UHF. Also, with separate antennas you don't have to worry about retuning when
switching between VHF/UHF and HF.
A consideration when using a duplexer is that the DC voltage for tuning the ATAS-100 is
supplied through the HF pigtail. Therefore, this pigtail must always be connected to the
ATAS for tuning purposes. Also, it must not be capacitively coupled inside the duplexer
or it will block the DC motor control voltage.
Extra Bands
You may have noticed two extra bands appear while moving through the normal ham
bands using the up/down keys. Apparently, the rig remembers an extra band for HF and
another for V/U portions of the radio. If you tune outside a normal ham HF band either
accidentally or intentionally, you'll notice that this band will now appear in a list of bands
as you use the up/down keys. The same is true for the V/U side of the radio. For example,
if you tune to the weather band at 162 Mhz, it will appear in the list between the 2M and
70cm bands. Short of resetting the radio, there's no way to get rid of these bands. Some
have elected to move them to the end of the list by tuning a frequency below 160M or
above 70cm so that they don't appear inside the list of bands.
Factory Modifications
There are two common modifications retrofitted to the FT100s manufactured prior to
2001. These include the fixes for the Intermittent High SWR ICON problem and the
VHF/UHF thermal sensor modification to enable the fans in the V/U receive mode.
Although there had been reports that new radios included the SWR mod, the mod has
been through several iterations and it's possible that even radios purchased today do not
include the 'final' mod with the screws, but rather just the copper tape held on with
adhesive.
Intermittent High SWR ICON
Some owners have had trouble with the HIGH SWR Icon appearing while attempting to
transmit on certain bands. The most common advice is to make sure that the antenna
mount and radio are properly grounded via some heavy braided material to the vehicle
chassis. Some owners have had success in using clamp-on ferrites with the separation kit
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...