Yaesu FT-2000D, Руководство по эксплуатации

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Page 8 FT-2000D O
PERATING
M
ANUAL
A
NTENNA
C
ONSIDERATIONS
The FT-2000D is designed for use with any antenna system providing a 50 Ohm resistive impedance at the desired oper-
ating frequency. While minor excursions from the 50-Ohm specification are of no consequence, the transceiver’s Auto-
matic Antenna Tuner may not be able to reduce the impedance mismatch to an acceptable value if the Standing Wave Ratio
(SWR) present at the Antenna jack is greater than 3:1.
Every effort should, therefore, be made to ensure that the impedance of the antenna system utilized with the
FT-2000D
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, and an external wide-
range antenna coupler must be used with this antenna type.
Any antenna to be used with the FT-2000D must, ultimately, be fed 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 so as to
ensure proper antenna performance.
The same precautions apply to any additional (receive-only) antennas connected to the RX ANT jack; if your receive-only
antennas do not have an 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-2000D 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, except for the “RX OUT” BNC connector.
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