HC-1500AT
2
3. Cautions
Note the followings for the safety of the operator.
A If any smoke, odor, or fire is detected, take the following steps for safety.
1 Cease the transmission.
2 Turn off the power of linear amp and radio.
3 Turn off the power of tuner.
B High RF Voltage
A high RF Voltage is generated during the transmission period.
· Never remove the top cover.
· Never operate without connecting an antenna.
· Never touch RF connectors.
· Be careful of the tuner cabinet as it may bear RF voltage depending on the antenna type
connected.
· Those operators with heart pacemakers must not approach the tuner.
· Avoid the risk of RF burn from a high SWR antenna on its element length.
· Never touch cooling fan inside as well as L, C components, as they generate much heat
during operation.
C Limited Application
This tuner is designed for the use of the amateur radio station operated by qualified
operator. Application for other than designed purpose leads to the failure of the device
and/or the severe damage to the surrounding devices. Never exceed the maximum
handling power of 1.5kW.
D Setting
Internal parts such as tuning coils and motors are forced air cooled and need air
ventilations. Keep at least a few inches of space from the rear wall, and a space of rubber
feet height at the bottom. Keep out of direct sun light, in a clean dry environment.
E Power Derating for high SWR Antenna
When the antenna has high SWR of 3 to 4, reduce RF output power by at least a half not
to damage the tuning components.
Also never attempt to tune to very high SWR antenna, even if the tuner happens to work,
or the tuning relays and capacitors as well as coax cable will be severely heated and
damaged.
F Power ON Sequence
It is recommended to turn on the transceiver first, then the amplifier, and finally the auto
tuner.
G Power Off/Thru
When the POWER switch is turned off, ANT1 port is the default bypass antenna port.
H Tube Linear Amp
Combination with tube type linear makes plate tuning circuit and tuner network connected
in a cascade way. As they mutually affect each other, note the following tuning procedure.
1 Tune the amp with 50
Ω
dummy load first. Then, tune the tuner with linear amp in
STBY (off) mode.
2 Alternatively turn the tuner, first, with amplifier in STBY (off), and then tune the linear for
maximum power output.
