Kenwood TR 7800 Bedienungsanleitung

TR 7800

TRIO

KENWOOD

VHF

TRANSCEIVER

SECTION 1

INSTALLATION

1 -1 INTERCONNECTION

Connect the antenna and power supply as shown in Fig. 1-1 for fixed station.

1-2 FIXED STATION Installation, [general]

Power supply (Fig. 1-1)

A Power supply (output current; 8A or more) is required. Antenna (Pig. 1-3) various types of fixed station

antennas are commercially available. Select your desired antenna according to your in-stallation space and application.

Note that the SW R of your antenna should be less than 1 5 A high SWR will cause the TR-7800 protective circuit to

operate, reducing the transmit output power.

1-3. MOBILE INSTALLATION, [GENERAL]

Installation location

Using the supplied mounting bracket, install the transceiver under the dashboard or on the side of the console in

your car. - Refer to Fig. 1-2A and Fig. 1-2B.

If your car is equipped with an electronic fuel injector, the transceiver should be as far from the control

equipment as possible.

Antenna installation

Various types of antenna for 2 meter mobile operation are available. (See Fig. 1-2C)

Note:

For gutter-mount installation, the antenna bracket must be grounded to the car body as shown in Fig. 1 -2C.

Affix the antenna securely, referring to the antenna instruction.

Power supply

Connect the supplied power cord with fuse directly to the battery terminals. Connecting to the cigarette lighter

socket can cause a poor connection, and excessive voltage drop

Ignition noise

The transceiver is designed to suppress ignition noise;however, if excessive noise is present, it may be necessary

to use suppressor spark plugs (with resistors).

1 4. Back-up Power

1 With power supplied directly from the car battery, the micro computer continues operating even when the power

switch is OFF. Current drain is very low. approximately 25 mA.

2 If you wish to retain the memories even when moving the unit between the car and the fixed station, utilize a battery

back-up system. Otherwise, all the memories are cleared when the power cord is disconnected.

(1) Use four AA NiCad batteries, available Locally.

(2) Open the lower cover of the transceiver.

(3) Install the batteries into the battery case located on the left

side. making sure that polarity is correct.

(4) The batteries are charged when the power switch is turned

ON.

Charging current is about 30 mA. The battery back-up function

operates only when the power cord is disconnected.

3. Back-up is available for about 3 to 5 days. To extend the

back-up period, connect the (optional) BC-1 to the external

back-up terminal.

Note:

1. Employ the same brand batteries in the same charge condition.

2. Take the batteries away if you don't use them for a long period.

Fig. 1-4 Battery Back-up

SECTION 2.

CONTROLS AND TERMINALS

2-1. Front Panel

1. VOL/POWER

Power ON-OFF switch and volume control are combined. Turning the control fully counter clockwise will turn

the power OFF. Clockwise rotation will increase the volume. In the power OFF position, about 2.5mA current is drawn

to back-up the micro-computer, provided the power cable is connected to a constant power source. To completely disable

the transceiver, disconnect the power cable.

2. SQUELCH

The squelch control is used to eliminate noise during no-signal time. Normally, this control is adjusted clockwise

until the noise disappears and the BUSY indicator goes off (threshold level). For scan operation, this control must be set

to the threshold point.

3. TX Shift Indicator

+ (RED): By pressing the GD key on the keyboard (11). the indicator will light, indicating that transmit

frequency is switched up 600 kHz from the receive frequency. (Refer to the item FH key)

S (YELLOW): By pressing the S key on the keyboard #(11). the indicator will light, indicating that the

transceiver is operating in the simplex mode. (Refer to the item S key)

— (RED): by pressing the - key on the keyboard #(11). the indicator will light, indicating that transmit

frequency is switched down 600 kHz from the receive frequency. (Refer to the item - key)

4. Frequency Display

This LED frequency display indicates the operating frequency in 4 digits (MHz-kHz).

Example: 145.950 MHz is indicated as "5.950".

5. BUSY Indicator

This lamp will light when the squelch is open in receive mode.

6. S/RF Level meter

This LED level meter indicates receive input signal strength (S) or transmit output (RF).

7. ON AIR indicator

A light emitting diode (L E D) will light in the transmit mode.

8 CH Indicator

This LED indicator indicates the channel No (0 through 14) in 2 digits

9. HI/LOW Switch

This switch is used to set transmit output power to either 25W (high) or 5W (low).

Power is high at the normal out position, and is low at the in position.

10. MIC Connector (6-pin)

For connection of the supplied microphone.

UP 4

GND 5

NC 6

MIC connector (from FRONT PANEL)

11. Keyboard

The keyboard has the following functions (Refer to "SECTION 3. OPERATION"):

[1] – [0] (Number key):

Depress four keys to set the desired operating frequency.

Example: Depress the keys, [5].[9].[5] and [0] . The frequency display will indicate "5.950" (145.950 MHz).

[+] (+ shift key):

After setting the operating frequency, depress this key. The transmit frequency will be switched up 600 kHz from the

receive frequency.

[S] (Simplex key):

Depress this key and the transceiver will be set in simplex mode (transmit and receive frequencies are the same).

[-] (- shift key):

After setting the operating frequency, depress this key. The transmit frequency will be switched down 600 kHz from

the receive frequency

(M)(Memory key):

This is used to input desired frequencies (including ±600 kHz shift) to each channel for memory. Press the key and a

check tone will be heard.

[C] (Clear key):

By pressing this key. the frequency set by the number keys is cleared. In this case. the frequency display indicates the

frequency that was displayed before the number keys were pressed. Use this key you have mistakenly entered setting

this key is also used to release the scan operation.

[SC] (Scan key):

This is used for scan operation. Press the key when this SQUELCH (2) is ON. Auto-scan or memory-scan starts

according to the position of the KEY/M SEL switch and STEP switches.

12. KEY/M. SEL Indicator

This indicates the position of the KEY/M. SEL switch. The KEY indicator will light when the switch is

depressed, and the M. indicator will light in the out position.

13. KEY/M. SEL Switch

This switch is used to select the method of setting frequency, either by the keyboard or the memory. In the

depressed position the operating frequency can be set by the keyboard; in the normal out position, the operating

frequency can be set by using the MEMORY channel selector (16).

14. STEP Switch

Use this switch to select the steps 25kHz (button out). or 5kHz (button in) during frequency scan or microphone

UP/DOWN operation.

15. REV Switch

This switch is used to reverse the repeater shift (±600 kHz) and other transmit/receive frequencies (CH 13. 14). It

is a momentary non-lock type switch and returns to the normal out position when released.

16. MEMORY Channel Selector

This switch is used to select the desired memory channel. There are 15 memory channels. Of these, channels 0 ~

12 store frequencies including ±600 kHz shift. The other two channels. 13 and 14 are "ODD split" channels, storing

transmit and receive frequencies individually. Channel "14" is the priority channel.

17. PRIORITY ALERT Switch

This switch is used to check the priority "14" channel. Depress the switch and the priority channel can be

checked at about 6 second intervals regardless of the KEY/M. SEL switch position. Tone sounds when the priority

channel is in use.

18. PRIORITY OPER Switch

This switch is used to call up the priority ("14") channel By depressing the switch, the operating frequency is

switched to the priority channel.

19. TONE Switch

When this switch is pressed, the repeater control tone burst signal (1.750 Hz) is emitted for about 0.5 second at

the beginning of each transmission.

2-2. Rear Panel

20. ANT Terminal 2-3. Microfone

Antenna terminal. impedance. Connect an antenna of 50 ohms

21. DC Power Terminal

DC power input terminal. Connect the supplied power cord with plug. Input voltage is 13.8V DC.

Observe plus ( + ) and minus ( — ) polarity

22. EXT. BACK-UP

External power back-up terminal to retain the memories. For internal back-up operation, install four AA NiCd

batteries in the built-in battery case. Use this terminal to retain the memories for a long period of time (more than

1 week), or with the power cord disconnected.

23. EXT. SP Terminal

External speaker terminal. Connect an 8 ohms speaker using the supplied plug.

24. DWN Switch

This switch is used to step the operating frequency down during both keyboard and MEMORY Channel

operation. When pressing the switch, a tone will sound. When the DWN or UP switch is held. the frequency shirts

rapidly. Pressing both the UP and DWN switches simultaneously results in stopping the frequency control operation.

25. UP Switch.

This switch is used to step up the operating frequency in both keyboard and MEMORY channel operation.

When pressing the switch, a tone will sound.

26. PTT Switch

Press-to-talk switch used for transmission. This will also release scan operation.

SECTION 3

OPERATION

3-1 General

1. This transceiver uses a PLL synthesizer controlled by micro-computer. The operating frequency can be shifted in

either 5 kHz or 25 kHz steps.

2. Operating frequencies can be set by simply pressing the keys on the keyboard. Frequencies can also be stored in the

memory channels (15 channels).

3. Transmitter precautions

(1) The TR-7800 antenna impedance is 50 ohms. Be sure to connect an antenna of 50 ohms impedance.

(2) Check the transmit frequency before operating to insure that you do not interfer with other stations.

(3) By pressing the microphone PTT switch, the TR-7800 is set in transmit mode; the ON AIR Indicator will light

and the meter indicates transmit power. Hold the microphone about 5 cm from your mouth and speak.

4. Micro-Computer Reset (At first power-up)

If, at initial TURN-ON, an erroneous or incorrect readout is displayed, reset the MICRO-COMPUTER. This is not

an equipment malfunction.

To proceed:

(1) Disconnect the power plug from the DC power terminal (21) and after about five seconds reconnect the power

plug. Turn on the power switch (1).

(2) if BACK-UP BATTERIES INSTALLED

First remove the batteries, and reset the MICRO-COMPUTER as previously described. Reinstall the batteries.

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