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nc)
° Subaudible tone
3-3-4.
AM mode
1. Set the Meter switch to PWR.
2. Set the MODE
key to AM.
3. Place the Standby switch to SEND.
Place the Meter switch to ALC.
Adjust the MIC
gain control so that the meter
deflection does not exceed ALC
zone
on voice
peaks.
9m
3-4. AUTOMATIC
ANTENNA TUNER
(The AT unit AT-440 is required for
this function.)
The
automatic
antenna
tuner
operates
within
the
amateur radio bands from 3.5 thru 29.7 MHz.
1. Ensure that an antenna designed for use within the
band you intend to operate on is properly connect-
ed to the antenna terminal.
3. Place the AT TUNE switch to the ON position. The
AT TUNE indicator will light and the tuner will be-
gin tuning. Then the CW mode indicator will light.
4. After a short period the AT TUNE indicator will go
OFF and the motors will stop turning.
5. Place the AT TUNE switch to OFF.
Notes:
2. Normal operation is not possible until the AT TUNE
Switch has been turned OFF.
3-5. DUAL DIGITAL VFO's
Operational convenience can be enhanced thru the use
of both VFO A and VFO B.
3-b-1.
Why two VFO's
Occasionally DX stations will utilize an operational
procedure known as split frequency operation. When
the DX station is in this mode he will be transmitting
on one frequency and receiving on another. This is
done in order for the DX station to be able to recog-
.
nize the calls of stations during pile-ups.
Older transceivers required the use of an external VFO
to
allow
this
split
frequency
operation.
The
TS-440S/44X, thru the use of microprocessor controls,
effectively provides two separate VFOs in the same
package. Several different controls and switches have
been provided to increase the operators convenience
when faced with this type of operation. The use of
these controls is discussed below.
3-5-2.
Split frequency
(a)
A=B switch
Depressing this switch causes the data contained
in the inactive VFO (the VFO that is not currently
being displayed) to change to the same data con-
tained in the active VFO
(the one currently dis-
played).
Both
the
frequency
and
mode
are
changed.
(b) A/B switch
Allows selection of the desired active VFO. Each
time this switch is depressed the active VFO will
alternate between VFO A and VFO B.
(c) SPLIT switch
Allows the use of one VFO for transmit, and the
other for receive (Split Frequency operation). For
example:
VFO A is the active VFO, and VFO B is
the inactive VFO. Depressing the SPLIT switch will
cause the TS-440S/44X to receive on VFO A and
transmit on VFO B. The mode of reception and
transmission will follow the mode contained in the
appropriate VFO memory.
It is possible to work
cross band, cross mode if desired.
To avoid confusion during contest, or pile-up oper-
ations we recommend using VFO A for receive and
VFO B for transmit.
(d) T-F SET switch
Depressing this switch will allow you to rapidly set
or check the transmit frequency,
during SPLIT
operations, without the need of actually trans-
mitting.
This switch is especially convenient when you are
trying to locate the transmit frequency of the sta-
tion currently in contact with the DX station, since
15
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