Yaesu FT-950, Руководство по эксплуатации, Страница: 10 / 132

Page 8 FT-950 O
PERATING
M
ANUAL
A
NTENNA
C
ONSIDERATIONS
The FT-950 is designed for use with any antenna system providing a 50 Ohm resistive impedance at the desired operating
frequency. While minor excursions from the 50-Ohm specification are of no consequence, if the Standing Wave Ratio
(SWR) present at the Antenna jack is greater than 3:1, the transceiver’s Automatic Antenna Tuner may not be able to reduce
the impedance mismatch to an acceptable value.
Every effort should be made to ensure that the impedance of the antenna system be as close as possible to the specified 50-
Ohm value. Note that the “G5RV” type antenna does not provide a 50-Ohm impedance on all HF Amateur bands. An
external wide-range antenna coupler must be used with this antenna type.
Any antenna to be used with the
FT-950
must be fed from the transceiver with 50 Ohm coaxial cable. Therefore, when
using a “balanced” antenna such as a dipole, remember that a balun or other matching/balancing device must be used to
ensure proper antenna performance.
The same precautions apply to any additional (receive-only) antennas connected to the antenna jacks; if your receive-only
antennas do not have impedance near 50 Ohms at the operating frequency, you may need to install an external antenna tuner
to obtain optimum performance.
A
BOUT
C
OAXIAL
C
ABLE
Use high-quality 50-Ohm coaxial cable for the lead-in to your FT-950 transceiver. All efforts at providing an efficient
antenna system will be wasted if poor quality, lossy coaxial cable is used. This transceiver utilizes standard “M” (“PL-259”)
type connectors.
I
NSTALLATION AND
I
NTERCONNECTIONS
1/16''
3/4''
1 1/8''
3/4''
Adapter
1/8''
5/8'' 3/8''
T
YPICAL
PL-259 I
NSTALLATION