Kenwood TM-521E - Manual (Page 12)

4-2-2. Frequency and Memory Channel Selec­
tion
The desired operating frequency and the Memory
Channel may be selected by using either the TUNING
control or the microphone UP/DWN switches. Press
the VFO/M key to alternate between the VFO and
the Memory Channel modes.
4-2-3. Frequency Step Selection
The frequency step can be selected by using the
following procedure:
1. Press the VFO/M key to select the VFO mode.
Press the M.IN key and then the REV key.
Whenever the M.IN key is pressed, the M in­
dicator will turn on. You must complete the
desired action within 5 seconds, or the M in­
dicator will turn off. If the indicator goes off, you
must press the M.IN key again.
Select the desired frequency step using the TUN­
ING
control or the microphone UP/DWN
switches. The figure below shows how the TUN­
ING control and UP/DWN switches will increase
or decrease in size.
2 .
3.
Turn the TUNING control
counterclockwise or press
the microphone UP switch.
With the TM-221A
-------25kHz----------- ■5kHz-
Turn the TUNING control
clockwise or press the
microphone OWN switch.
--------------------10kHz----------
-20kHz- -15kHz-
With the TM-221ES
-------25kHz------------- -12.5kHz- -5kHz-
-20kHz-
With the TM-321A
-------15kHz------------
-15kHz-
-20kHz-
-10kHz-
-25kHz-
•10kHz- -5kHz-
Wlth the TM-421 series
------ 20kHz------------------------25kHz- ■12.5kHz-
15kHz-
With the TM-521 series
Í
12.5kHz
I_________________
-10kHz-
-25kHz
-5kHz
-20kHz-
1
10kHz
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4, To return to the normal receive frequency, press
any key except the LOW or the POWER
switches, or turn the TUNING control.
4-2-4. ALT (Auto Lock Tuning) System (TM-521
series only)
The ALT system operates similar to an AFC
(Automatic Frequency Control) system. This system
is useful when the frequency of either station starts
to drift. When this occurs distortion of the signal is
the usual result. The ALT system will correct for this
apparent drift.
(Example)
Frequency
Transmit Frequency Receive Frequency
of the Distant Station
|ALT System is[
performed.
Frequency
Transmit Frequency Receive Frequency
of the Distant Station
Note:-----------------------------------------------------------------------------
The frequency display will not change, even though
the receive frequency might shift in order to properly
tune the incoming signal. When the ALT system is
operating the Direction indicator will turn on if the
system shifts the receiver frequency. The Direction
indicator will show you if the incoming signal was
higher or lower than the displayed frequency.
Turns on when the transmit
frequency of the distant sta­
tion is higher than your receive
frequency.
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Turns on when the transmit
frequency of the distant sta­
tion is lower than your receive
frequency.
To utilize this feature:
(With the TM-521 A)
1. Press the M.IN key. The M indicator will turn on
for 5 seconds.
2. While the M indicator is on press the SHIFT key.
If you do not press the SHIFT key while the M in­
dicator is on you will have to start over at step
one. The ALT indicator will turn on and the
receiver will automatically center itself on the in­
coming signal.
M.IN key M indicator
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3. To release the ALT system, press the M.IN key
and then the SHIFT key. The ALT and the Direc­
tion indicators will turn off.
12