89
16 TROUBLESHOOTING
OPERATION NOTICES
The transceiver has been designed and engineered
to avoid possible hardware glitches. However, you
may notice the following symptoms when you operate
the transceiver. These symptoms are not
malfunctions.
DC POWER SUPPLY
As stated in the SPECIFICATIONS {page 91}, this
transceiver requires a supplied DC voltage source of
13.8 V
±
15%. If you find that the transceiver cannot
be switched ON, or that it shuts OFF automatically,
the DC voltage may be outside the specified range.
In such a case, remove the DC cable from the
transceiver immediately and confirm that the supplied
voltage is within the specified range.
FAN NOISES
When the TX/ RX unit is installed in a non-ventilated
area, the cooling fan(s) may increase in speed and
emit a high level of noise for a long time. This is
because the TX/ RX unit cannot be cooled down with
the regular fan speed. In this case, relocate the TX/
RX unit so that air can easily flow through the TX/ RX
unit to keep the unit cooled.
INTERNAL BEATS
On some spots of the receiver frequencies, the
S-meter moves or you cannot receive any signals.
This is inevitable when you use superheterodyne
receivers. You may notice the signals on the
following spots of the frequency.
15.600.00 MHz, 31.200.00 MHz, 46.800.00 MHz
AGC
When you turn the AGC function OFF {page 35}, the
receiving audio signals can be distorted. In this case,
decrease the RF gain, turn the pre-amplifier OFF, or
turn the attenuator ON. In general, the RF gain must
be greatly reduced when the AGC is turned OFF.
60 m BAND OPERATION (K-TYPE/ U. S. A. ONLY)
Effective from July 3, 2003, FCC Report and Order
(R&O) in ET Docket 02-98 granted US amateurs
secondary access to five discrete channels in the
vicinity of 5 MHz. General, Advanced, and Amateur
Extra licensees may use the following five channels
on a secondary basis with a maximum effective
radiated power of 50 W PEP relative to a half wave
dipole. Only upper sideband suppressed carrier voice
transmissions may be used. The frequencies are
5330.5, 5346.5, 5366.5, 5371.5 and 5403.5 kHz. The
occupied bandwidth is limited to 2.8 kHz centered on
5332, 5348, 5368, 5373, and 5405 kHz respectively.
The TS-480 transceiver stops at this new 60 m band
as you scroll up or down amateur radio frequency
bands. For more information, contact ARRL or
search their Web site (http://www.arrl.org) with a key
word, “60 meter”.
