Yaesu FT-100D Operating Manual page 15

Installation
ANTENNA CONSIDERATIONS
Base Station Antenna Installations
When installing a "balanced" antenna such as a Vagi or dipole, remember that the FT -100
is designed for use with an (unbalanced) coaxial feedline. Always use a balun or other
balancing device so as to ensure proper antenna system performance.
Use high-quality
son
coaxial cable for the lead-in to your FT- 100 transceiver. All efforts
at providing an efficient antenna system will be wasted if poor quality, lossy coaxial cable
is used. Losses in coaxial lines increase as the frequency increases, so a coaxial line with
0.5 dB ofloss at 7 MHz may have 6 dB ofloss at 432 MHz (thereby consuming 75% of
your transceiver's power output!). As a general rule, smaller-diameter coaxial cables tend
to have higher losses than larger-diameter cables, although the precise differences depend
on the cable construction, materials, and the quality of the connectors used with the cable.
See the cable manufacturers' specifications for details.
For reference, the chart below shows approximate
loss figures for typically- available coaxial cables
frequently used in HF installations.
Loss in dB per 30m (100 feet)
for Selected 50n Coaxial Cables
To 144 MHz 1430 MHz Antenna
Loss figures are approximate; consult cable
manufacturer's catalogs for complete specifica-
tions.
Antenna Cable (supplied with FC-20)
FT-100
Control Cable (supplied with FC-20)
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TUNER
FT-JOO
MICRO MOBILE OPERATING MANUAL
13