Vertex Standard FT-2000 ユーザーズマニュアル
Page 8
FT-2000 O
PERATING
M
ANUAL
A
NTENNA
C
ONSIDERATIONS
The FT-2000 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, the transceiver’s Automatic
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.
frequency. While minor excursions from the 50-Ohm specification are of no consequence, the transceiver’s Automatic
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-2000 be as
close as possible to the specified 50-Ohm value.
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.
range antenna coupler must be used with this antenna type.
Any antenna to be used with the FT-2000 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.
“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.
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-2000 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.
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''
A dapter
1/8''
5/8''
3/8''
T
YPICAL
PL-259 I
NSTALLATION