Kenwood TM-521A User Manual

4. OPERATION
Warning:
1. When operating this transceiver mobile, please drive safely.
2. Remove all packing materials before operating this transceiver.
Note:
An internal heterodyne tone resulting from internal mixing may be en-
countered at 1244.150 MHz and 1245.050 MHz. (TM-521A/E only)
4-1. CONTROL FUNCTIONS Note:
4-1-1. Front Panel The TM-221A front Bae is used for illustration purposes.
® ® ® @ ® © @®
VFO/M__M|
(ea ]
SCAN CTCSS TONE
conn
(ie a Pe ee
OOOODOOO0O!
zl
ef
==
@ VFO/M (VFO/Memory Channel) key
This key is used to switch between the VFO and
Memory Channel modes.
@) M.IN (Memory In) key
This key is used to enter a frequency, offset, etc. in-
to the desired Memory Channel. The key is used dur-
ing VFO operations only. When this key is pressed
during memory operations the contents of the
memory are transferred to the VFO and switch the
set back to the VFO mode.
This key is also used when programming the offset,
offset frequency, tone frequency (TM-221A/321A/
421A/521A only), and CTCSS decode (TM-221A/
321A/421A/521A only), and operating the ALT
(Auto Lock Tuning) system (TM-521A only).
(3) MHz key
Used to change frequencies rapidly. During VFO
operations, pressing this key will cause the kHz
digits to disappear from the display. Rotating the
TUNING control will then change the frequency in 1
MHz steps.
This function will be released by pressing any key or
microphone PTT switch except the LOW (HI/LOW)
and POWER switches. This function is also canceled
5 seconds after the last input from the TUNING con-
trol.
@) Display Panel
The LCD displays operation information such as
transmit/receive frequencies, memory channel infor-
mation, offset, tone frequency etc. See page 9 for
additional information.
(©) VOL (Volume) control
Turn the control clockwise to increase the volume
and turn the control counterclockwise to decrease
the volume.
© LOW (HI/LOW) switch
This switch is used to select the desired transmitter
output power level.
@ POWER switch
Press to turn on. Press again to turn off.
MICROPHONE connector
Plug the standard or optional microphone into this
jack.
(8) GND (PTT)
(1) Microphone —_ (7) GND (Microphone)
~ audio
(2) PTT (STBY) 6) RX detector output
~ switch ~~” (Approx.
. 100 mV/10 kQ)
(3) Down ——— ~(5) 8 V/Max. 15 mA
Front view
@) SQL (Squelch) control
The SQL control is used to eliminate noise during no
signal periods. Normally this control is adjusted
clockwise until the noise just disappears, and the
BUSY indicator goes off. (Threshold level)
For scan operations this control must be set to the
threshold point. When an incoming signal is weak or
unstable, readjust the SQL control for optimum
reception.
(0 Function keys
See Section 1. Function Keys on page 9.
() TUNING (VFO) control
This control is used to select the desired transmit/
receive frequency, Memory Channel, Frequency
Step, Tone Frequency (TM-221A/321A/421A/
521A only), and Scan Direction.

Kenwood TM-521A Specifications

General

Brand	Kenwood
Model	TM-521A
Category	Transceiver
Language	English