Section 3. Operation; Mode Switch; Digital Vfo; Search/D.step (Ds) Switch - Kenwood TR-9000 Instruction Manual

Receive carrier frequency
Transmit frequency
V
800Hz
f
Displayed frequency
Fig. 3-1 Frequency Display in CW Mode
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SECTION 3. OPERATION
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3.1 MODE SWITCH
The five-position MODE switch functions as follows:
FM1: FM frequency is selected in 10 kHz steps by using
the VFO, regardless of the DS switch position.
FM2: In this mode, FM frequencies are selected in either
100 Hz or 5kHz steps.
USB: Normal mode for 2m SSB. Frequencies are tuned
in 100 Hz steps.
CW:
CW mode operates A 1 . KEY jack and STBY jack
are provided on the rear of the TR-9000. Connect
a key for CW operation. The filter for SSB mode is
also used for CW mode. The AGC time constant is
automatically "fast".
LSB: This mode is not used for 2m SSB, but is used for
special operation such as Oscar satelite com-
munication.
3.2 DIGITAL VFO
The TR-9000 incorporates a digital 100 Hz step 2-VFO
system (click type rotary) controlled by micro-computer.
Note:
1. Since all the functions are controlled by a microcom-
puter, the transceiver must be operated in the priority
order given in the following Table.
For example, the digital VFO will not operate when the
main dial is turned during MR operation. Also, it will not
operate unless scan operation is released by the HOLD
switch or the microphone PTT switch, even if scan is
stopped for a brief period of time in receive mode.
Sequence/
Operation
Function
Switch and
Controls
1 Memory recall MR ON
2 Scan operation
SCAN, HOLD ON
3
UP/DOWN
operation
UP/DOWN ON
4 Digital VFO
Main dial
5 Memory Write
M ON
6
Search operation DS Switch ON
Table 3-1
2. The micro-computer is programmed to operate in
receive mode, except one transmit frequency is also
stored in memory channel "5". Note that the main dial
and UP/DWN controls do not function during transmission.
3. The digital VFO is factory adjusted under rigid quality
standards to insure excellent frequency linearity and
stability.
• Tuning
1. Operating frequencies are basically tuned by the main
dial. Turning the dial to the right will shift the frequency
UP. If fine adjustment is desired in SSB or CW mode, the
RIT circuit may be operated.
2. The digital VFO can be step tuned by the microphone
UP/DWN switches. A tone will sound at each switch
press. The VFO frequency shifts rapidly when the
switch is continuously depressed. The tone will then
become continuous.
3. The digital VFO covers the 2m band from 143.9000 to
148.9999MHz in continuous mode. The VFO can be
tuned either left or right.
4. The transceiver incorporates two VFOs, VFO-A and
VFO-B. VFO Selection is by the VFO switch. VFO-A and
VFO-B are the same in function, except that each has its
own reset frequency.
5. In SSB mode, the VFO frequency is tuned in 100Hz
steps. In 2m SSB operation, the USB mode is generally
used. If the VFO frequency is shifted UP in 100Hz
steps, the demodulated audio signal changes from high
to low pitch. For optimum SSB operation, tune the VFO
so the demodulated signal is clear and natural. Frequen-
cy can be fine tuned by the RIT, ± 1.0kHz from the fre-
quency displayed.
6. In FM mode, the RIT circuit does not operate, since a
signal can be heard clearly even when its frequency is
1.0kHz.
• Frequency display
1. The digital frequency display indicates carrier frequency
in SSB and FM modes. The frequency displayed is the
operating frequency.
2. In CW mode, the frequency display indicates the
receiver carrier frequency. Transmit frequency is 800Hz
higher than displayed. (Operating frequency is 800Hz
higher than displayed when receiving an 800Hz beat
note.) (See Fig. 3-1).
3.3 SEARCH/D.STEP (DS) SWITCH
This is one of the special features of the TR-9000. The
basic function of this switch is to change the frequency
shift from 100Hz to 10kHz step. In FM1 mode, the fre-
quency shift step is independent of the DS switch. In
SSB/CW mode, both search and frequency shift are in
10kHz steps.
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