Kenwood TH-55AT User Manual

144MHz FM TRANSCEIVER

TH-25A SERIES

430/440MHZ FM TRANSCEIVER

TH-45A SERIES

1200MHz FM TRANSCEIVER

TH-55AT SERIES

INSTRUCTION MANUAL

KENWOOD CORPORATION

©PRINTED IN JAPAN B50-8170-30(K, M, W. T, X)(T) 89/12 11 10 987654321 88/12 11 10 98765432

Thank you for purchasing this new transceiver.

IMPORTANT:

Please read this instruction manual carefully before placing your transceiver in service.

_______________________

SAVE THIS INSTRUCTION MANUAL

This Instruction Manual covers the following models: TH-25AT :144 MHz FM transceiver with DTMF Pad.

TH-25A :144 MHz FM transceiver without DTMF Pad. TH-25E :144 MHz FM transceiver with Tone.

TH-45AT :430/440 MHz FM transceiver with DTMF TH-45A :430/440 MHz FM transceiver without DTMF TH-45E :430 MHz FM transceiver with tone.

TH-55AT :1200 MHz FM transceiver with DTMF Pad. TH-55E :1200 MHz FM transceiver with Tone.

Under normal circumstances, the transceiver will operate in accordance with these operating instructions. The transceiver has been adjusted at the factory and should on ly be readjusted by a qualified technician with proper test equipment. Attempting service or alignment without factory authoriza tion can void the transceiver's warranty.

CAUTION:---------------------------------------------------------------------Long transmission or extended operation in the HI power mode might cause the rear of this transceiver to get warm. Do not place the transceiver where the heat sink (rear panel) might come in contact with plastic or vinyl surfaces. Use of an external antenna for fixed station is recommended.

Illustrations show the TH-25A.

(with Tone Burst for U.K. version)

Pad. Pad.

(with Tone Burst for U.K. version)

CONTENTS

1. SPECIFICATIONS and ACCESSORIES

2. BATTERY PACK............................................................... 6

3. OPERATION

OPERATING CONTROLS................................................. 8

RECEIVER OPERATION TRANSMITTER OPERATION

MEMORY..........................................................................13

AUTOMATIC MEMORY INITIALIZATION MEMORY ENTRY MEMORY SHIFT MEMORY RECALL ODD SPLIT

MEMORY CHANNEL LOCKOUT................................15

CLEARING ALL MEMORY..........................................16

MEMORY BACK-UP BATTERY SCAN REPEATER OPERATION

TRANSMITTER OFFSETS REVERSE FUNCTION TONE OPERATION

AUTOPATCH BEEP TONE TONE ALERT SYSTEM BATTERY SAVER AUTOMATIC POWER OFF BATTERY SAVER and AUTOMATIC POWER OFF function CANCEL (TH-55AT/55E only)

4. BLOCK DIAGRAM and

SCHEMATIC DIAGRAM...............................Another sheet

5. MAINTENANCE...............................................................22

IN CASE OF DIFFICULTY

6. OPTIONAL ACCESSORIES

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19 20

Back cover

1. SPECIFICATIONS and ACCESSORIES

1-1 SPECIFICATIONS

■ GENERAL

FREQUENCY RANGE (MHz)

MODE MEMORY CHANNELS FREQUENCY STEP (kHz)

ANTENNA IMPEDANCE (fl) POWER REQUIREMENT CURRENT DRAIN

FREQUENCY STABILITY (-10°C~ +60°C)

GROUND

DIMENSIONS (WxHxD)

WEIGHT (g) With NiCd Battery and Antenna

OPERATING TEMPERATURE MICROPHONE IMPEDANCE

■ TRANSMITTER

OUTPUT POWER

U.S. A. version European and U.K. version Others

LO transmit mode RECEIVE mode with no signal BATTERY SAVER mode AUTOMATIC POWER OFF mode

Projections not included (mm)

Projections included (mm)

HI 12 V (with PB-8 or DC-1)

12 V (with PB-8 or DC-1) 9 V (with BT-6)

7.2 V (with PB-5/6/7/9)

A/E AT

9 V (with BT-6)

7.2 V (with PB-5/6/7/9)

TH-25A/25AT/25E

144.000^.147.995 440.000'\^49.995 1258.000'vl 300.000

144.000'vl 45.995 430.000'v439.995 1258.000'n.I 300.000

144.000-n.1 47.995 430.000-v439.995 1258.000'vl 300.000

TH-25A/25AT TH-25E TH-45A/45AT TH-45E

68.5x 152.0x34.5 (2.7x6.0x 1.35 inch) 68.5X 172x37.5

68.5x 152.0x35.5 (2.7x6.0x 1.4 inch)

TH-45A/45AT/45E

2 m Band

5, 10

Less than 1.2 A

Approx. 0.9 A Approx. 0.8 A Approx. 1.1 A Approx. 0.8 A

Less than 0.4 A

Approx. 55 mA Approx. 60 mA Approx. 60 mA Approx. 16 mA Approx. 17 mA

Approx. 3.5 W Approx. 3.5 W Approx. 2.5 W Approx. 2 W Approx. 0.8 W

12.5, 5

Approx. 6 mA

58x137.5x29.5 (2.3x5.4x1.2 inch) 58x 157.5x29.5

400 (0.88 lbs.) 450 (0.99 lbs)

More than 5 W 1 W

70 cm Band

F3E (FM)

25, 5 12.5, 5

6'v16 (7.2 VDC nominal)

Less than 1.8 A Less than 1.0 A

Approx. 1.4 A

Less than 0.6 A Less than 0.6 A

Negative

-20°C~ +50°C(-4°F~122°F) 2 kfl

TH-55AT/55E

23 cm Band

25, 12.5

Less than 1.0 A

Approx. 17 mA

Approx. 5 mA

±3 ppm

(2.7x7.0x1.5 inch)

1 W

OUTPUT POWER LO MODULATION MAXIMUM FREQUENCY DEVIATION (kHz) SPURIOUS RADIATION DUTY CYCLE OPERATION

■ RECEIVER CIRCUITRY INTERMEDIATE FREQUENCY

SENSITIVITY 12 dB SINAD SQUELCH SENSITIVITY SELECTIVITY

RIT variable range AUDIO OUTPUT POWER (across 8 Q load 10% distortion)

1st IF (MHz) 2nd IF (kHz)

-6 dB

-40 dB Less than 28 kHz

1 minute transmission 3 minutes reception recommended

Less than 0.16 /tV

Approx. 0.5 W

REACTANCE

Less than — 60 dB

DOUBLE CONVERSION SUPERHETERODYNE

16.9

Less than 0.1 /iV

30.825 455

Less than 0.18 /iV

More than 12 kHz

More than 200 mW

Note: Circuit and ratings are subject to change without notice, due to development in technology.

1-2 ACCESSORIES

Unpack your transceiver carefully and confirm that the accessories listed below are included in the box. 1

Antenna.....................................

For 144 MHz or For 430/440 MHz or For 1200 MHz

Belt Hook...................................... J29-0424-04

Rubber Cap............................... ... B09-0309-04...........

3 4

Hand Strap Battery

......................................

........................

..................

.......................

................................

...T90-0356-05 ...T90-0355-05 ...T90-0364-05

... J69-0312-04

NiCd battery pack (PB-6)... ... W09-0507-05 9 Instruction Manual

Battery Charger

........................

After unpacking Shipping container: Save the boxes and packing in the

maintenance, or service.

...........

.....

forU.S.A. version (120 V) .. for European version (220 V). for U.K. version (240 V) for Oceania version (240 V).

.....

1 8 Warranty Card

for Other market (220 V) ....

Label

............................................

.............................

(120 V) ....

.......................

.....

event your unit needs to be transported for remote operation.

±5

..........

Approx. 0.1 W

Less than — 50 dB

Less than 0.25 /iV Less than 0.16 /iV

Less than 32 kHz

More than ± 5 kHz

. W09-0382-XX . W09-0388-XX . W09-0387-XX . W09-0386-XX . W09-0384-XX . W09-0385-XX . B42-3325-04

. B50-8170-XX

59.7

...........

..........

.....

1 1 1

2. BATTERY PACK

2-1 NiCd BATTERY PACK (PB-6)

This battery pack has not been charged at the factory in order to provide you with the greatest number of charge/discharge cycles. You must charge the battery before use. The battery pack will require several charge/discharge cycles before you can expect to see the maximum operating period between charges. If the battery will be stored for greater than 2 months it should be recharged before use.

2-2 RECHARGING

1. Slide the adapter onto the NiCd battery pack.

2. Plug the supplied charger

into an AC outlet.

3. Do not allow the battery

to charge for greater than

15 hours.

The useful life and battery

performance will be reduc ed if you exceed the recom mended charge period.

Note:

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Recharging should be performed within an ambient temperature range of between 5°C~40°C (41°F~104°F). Recharging the battery outside of this range may not allow the battery to reach full charge.

2-3 MANGANESE or ALKALINE BATTERIES

(Optional Battery Case BT-6)

Install 6 X R6 (AA) man ganese or alkaline batteries in the battery holder. Pay close attention the battery polari ties marked in the holder. We recommend the use of high performance manganese bat teries for the greatest operat ing time.

Note:

----------------------------------------

Do not install NiCd batteries and attempt to charge them with the supplied charger. There is no battery protection circuit in the battery holder.

Press down on the hook in the middle of the battery case top to open.

2-4 INSTALLING THE BATTERY PACK

Align the grooves in the bat tery pack with the trans- Release button ceiver and slide the pack to the right until it locks in place. To remove the battery pack push up on the release button and slide the pack to the left.

Hook

2-5 BATTERY VOLTAGE LEVEL METER

The S meter indicates the relative battery voltage during transmit.

Recharge/replace the batteries when the level reaches the low indicator.

NiCd Battery pack

MODEL

PB-5 PB-6 PB-9 PB-7 PB-8

mAli

200

7.2 600

1100

600

Fully charged

Fully discharged

Manganese or Alkaline batteries (Approximate battery con

dition)

New batteries

BT-6, 9 V

Need to replace

2-6 OPERATING TIME

TH-25 series

Batt voltage (V)

Transmitting Receiving

AF OUTPUT......................................0.2 W/8 iJ

•Battery voltage is measured at transmis

.........................................

sion (Hi).

1 minute

3 minutes

Lower limit voltage range for transmission

TH-45 series

Batt voltage (V)

NiCd battery 12V

600mAh (PB-8)

NiCd battery 7.2V 1 lOOmAh (PB-7) , ..

NiCd battery 7.2V 600mAh (PB-6)

Manganese battery (BT-6)

I battery 7.2V 200mAh (PB-5)

TH-55 series

Batt voltage (V)

NiCd battery 12V

600mAh (PB-8)

Manganese Manganese battery battery (BT-6) (Low-Power) (BT-6)

Transmitting.........................................1 minute

Receiving..........................................3 minutes

AF OUTPUT

'Battery voltage is measured at transmis

Manganese battery (Low-Power) (BT-6)

......................................

sion (Hi).

Lower limit voltage range for transmission

^ Anodine mangarww

battery (BT-6)

120 300 (minutes)

Transmitting.........................................i minute

Receiving..........................................3 minutes

AF OUTPUT

•Battery voltage is measured at transmis

NiCd battery 7.2V 600mAh (PB-6)

NiCd battery 7.2V

1 lOOmAh (PB-7)

......................................

sion (Hi).

Lower limit voltage range for transmission

AA Alkaline manganese

battery (BT-6)

0.2 W/8 D

0.2 W/8 Q

Manganese battery (Low-Power) (BT-6)

NiCd battery 7.2V BOOmAh (PB-6)

NiCd battery 7.2V 200mAh (PB-5)

Manganese battery (BT-6)

120

180

240

Alkaline manganese battery (BT-6)

360 (minutes)

120

180

240

300 (minutes)

We recommend use of the NiCd battery pack for long transmission or extended operation.

Manganese battery (except Alkaline manganese battery) is

available for Low position.

3. OPERATION

3-1 OPERATING CONTROLS

(T) Antenna connector

Connect the antenna that is supplied to this jack. Twist to lock.

d) TX indicator

ON whenever the transceiver is in the transmit mode.

(D Volume control/Power switch

The volume control and power switch are combined. Rotating the control clockwise will turn ON the transceiver. Advancing the control further clockwise will increase the volume.

0SQL control

This control is used to select the desired Squelch threshold level.

(DMHz key

This key is used to select the tuning rate of the Tuning control. When the MHz indicator is lit, the Tuning con trol will cause the transceiver to increase or decrease in 1 MHz step.

®VFO key

This key is used to switch back to VFO operation after operating in the MR (Memory Recall) mode. The tuning control will increase or decrease frequency in accor dance with the VFO indicator. See the chart below for your transceiver.

TH-25A/25AT

STEP SIZE 5/10

Pressing this key for longer than 1 second will initiate

the Band Scan function.

TH-25E/45E

12.5/5 25/5

TH-45A/45AT

TH-55AT/55E

25/12.5

(kHz)

® MR key

This key is used to switch from the VFO mode to the

MR (Memory Recall) mode. The tuning control may be used to select the desired memory channel in this mode. Pressing this key for longer than 1 second will initiate

the Memory Scan function.

® Tuning control

Rotate this control clockwise to increase frequency and counterclockwise to decrease the transmit/receive frequency. This control is also used to select the desired memory channel and the scan direction.

®Tone Alert key

This key is used to activate the Tone Alert function.

©Tone key

U.S. version: This key is used to activate the

subaudible tone encoder.

European version: This key is used to transmit a Tone

signal. When the key is depressed the repeater control signal of

1750 Hz is activated.

U.K. version: This key is used to activate the

1750 Hz tone burst.

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