Kenwood TR-851A Instruction Manual page 16

B. CW zero beating
Frequency selection in the CW mode is the same as
in the SSB mode.
(a) You can zero beat by rotating the TUNING knob
with the RIT switch OFF until the incoming CW
signal is 800 Hz (Note).
Relationship between transmit and receive fre-
quencies in CW mode.
|
800 Hz
beat tone
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=. ce
Displayert frequency YOOHZ Displayed frequency
4 ry
Loxal statien's transmit
— frequency ~ Orstant station's
(Zoro beat®
BFO trequency auring reception
Note: .—— ——
In CW receive operation, the BFO (Beat Frequency
Oscillator) is set 800 Hz below the transmit frequen-
cy.
With the transceiver, you can use the sidetone
oscillator frequency, about 800 Hz, as a guide for
zero beating.
(b) If the frequency of the distant station deviates
from 800 Hz or you wish to have a different
tone, set the RIT switch to ON and rotate the
TUNING knob until the desired tone frequency is
obtained.
4-2-4. Frequency selection
The transceiver contains two digital VFOs, VFO A
and VFO B, having a minimum tuning rate of 50 Hz
steps and 10 memory channels (1 thru 9, and O) for
easy selection of often used frequencies. The TR-
851A/751A also contains a COM channel. Normally
the TUNING knob would be used for frequency
selection, but thru the use of the MR, A/B, Up/Down
(V MHz/M.CH A) F.STEP and COM (TR-
851A/751A only) keys in combination with the
TUNING knob. Rapid frequency changes are possi-
ble.
A. 2 VFO {(A/B)
You can change frequencies using the TUNING knob
or the microphone UP/DWN switches. When VFO A
or VFO B is selected using the A/B switch, ''A'' or
'*B'' appears on the display panel.
VFO A and VFO B independently store data such as
frequency, mode, RIT switch ON/OFF status, F.STEP
switch status, TONE status, off-set frequency, and
tone frequency (TR-851A/751A only).
Example:
Operating VFO A in FM and VFO B in SSB
VFO A: Yrs FM, F.STEP OFF
VFO B: S4ba8 USB, F.STEP ON
B. MR (Memory Recall) channels
Press the MR key; ''MR'' will appear on the display
panel, indicating that the transceiver is in the
memory channel call state. Press the A/B key to
return the unit to VFO A or VFO B.
Memory recall can be selected using the Up/Down
(V MHz/M.CHA) key or the microphone UP/DWN
switch while ''MR'' is displayed on the panel
(Memory entry instructions, see page 19}. When the
TUNING knob is rotated while ''MR'' and the fre-
quency of the selected memory channel are
displayed on the panel, memory channel operation
will be cancelled and the transceiver will return to
VFO operation. Frequencies can be changed using
the VFO by noting the frequency selected when
""MR'' was on the display panel. (See ''Memory
shift''.)
C. COM (Common) channel
(With the TR-851A/751A)
Press the COM key; the COM indicator lights and the
COM channel mode is selected. Press the key again
to return to the previous mode. Pressing the MR key
while ''COM" is displayed selects the memory
channel mode; pressing the A/B key selects VFO A
or VFO B.
Note: --- -
When ''COM" is displayed, frequencies cannot be
changed using the TUNING knob, the W MHz/
M.CH A key, or the microphone UP/DOWN switches.
The COM channel! is factory-set to 433.000 MHz
with the TR-851A and 145.000 MHz with the TR-
751A, but may be reset to any desired frequency.
(See page 19)
OD. Frequency step
The step size in which frequencies are changed by
the TUNING knob or the microphone's UP or DWN
push buttons can be changed by the SCAN key, the
mode key and/or the F.STEP key.
i TR-851E
TR-851A TRI51A ) aR75IE
on | oFF | ON | orr | ON
5 | 5 | 10 |125/ 5 |
KHz | KHz | kHz | kHz | kHz
BOHZ| 5 | 50 Hz| 5 !|50Hz
T kHz) kHz | 1 kHz| kHz | 1 kHz