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Kenwood TR 7800 User Manual
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Kenwood TR 7800 User Manual

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TR 7800
TRIO
KENWOOD
VHF
TRANSCEIVER

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Summary of Contents for Kenwood TR 7800

  • Page 1 TR 7800 TRIO KENWOOD TRANSCEIVER...

  • Page 2: Installation

    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.
  • Page 3 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.
  • Page 4 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.

  • Page 5: Controls And Terminals

    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.
  • Page 6 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).
  • Page 7 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.

  • Page 8: Priority Oper Switch

    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.
  • Page 9 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.

  • Page 10: 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).
  • Page 11 3-2 Memory Input The TR-7800 has two different memories; normal memory and split channel memory (including priority memory channel). 1. Normal memory (CH 0-12) Example: To store 145.950 MHz ( — 600 kHz shift) in CH 5. (1) Set the KEY/M.SEL switch to the KEY position (——). (2) Set the MEMORY channel selector (16) to the CH 5 position.

  • Page 12: Memory Scan

    (4) Store the receive frequency in memory. Press the ( ) key. A continuous tone will sound, indicating transmit frequency is ready to be accepted Note: 1. The tone will sound intermittently until the transmit frequency is stored in memory. 2.

  • Page 13: Tx Offset And Reverse

    3-4 PRIORITY OPER Switch To call up the frequency stored m the priority "14" channel depress the PRIORITY OPER switch (19). 3-5 TX OFFSET and REVERSE After setting channels by the number keys on the keyboard. press the [+] or [-] key. The transmit frequency will be switched up or down 600 kHz from the receive frequency and the TX shift indicator (3) will illuminate.

  • Page 14: Section 4 - Additional Information

    SECTION 4 - ADDITIONAL INFORMATION 4-1 General Information Your TR-7800 has been factory aligned and tested to specification before shipment. Under normal circumstances. the transceiver will operate in accordance with these operating instructions. If your transceiver fails to work, contact the authorized dealer from which you purchased it for quick, reliable repair All adjustable trimmers and coils in your transceiver were preset at the factory and should only be readjusted by a qualified technician with proper test equipment Attempting service or alignment without factory authorization can void the transceiver's warranty.
  • Page 15 Kenwood TR 7800 Frequency range: 144-146 MHz (Europe) / 143.900-149 MHz (USA) Mode: FM RF Power output: Hi: 25W, Lo: 5W - Impedance: 50 ohms, SO-239 Voltage: 13.8 VDC Current drain: RX: 0.4-0.9 A, TX: Max 6 A Dimensions (W*H*D): 175*64*206 mm Weight: 2.1 Kg...
  • Page 16 MODIFICATIONS FOR THE KENWOOD TR-7800 TR-7800 Loss of Memory Intermittent loss of memory may be corrected by adding one resistor at the microprocessor on the control unit. Procedure: Remove bottom cover, 4 screws. From the Control unit X53-1180-xx unplug the rear mounted connectors 8-11.
  • Page 17 TR-7800/TR-9000 Optional Ceramic Filters FM Adjacent channel rejection in either unit may be improved by installing an optional narrow ceramic filter. Filter Part No. -6db Bandwidth -70db Bandwidth Retail CFK-455F L72-0304-05 +/- 6 kHz +/- 12 kHz $ 33.50 CFK-455G (CFK-455G)* +/- 4 kHz +/- 10 kHz...
  • Page 18 TR-7800 Tone pad conversion for 4th column function Users who desire ABCD control functions may be accommodate by an alteration to the Control unit and to the REV switch. This switch will then perform dual functions. Procedure Remove top and bottom covers, 4 screws each. To free the front panel remove 4 screws securing the front panel bracket to the side frame.
  • Page 19 TR-7800 Pulse noise Low level Pulse Noise reported in high power TX, or as a buzz from the speaker during TX, may be reduced or eliminated by the following steps. Procedure: If not already present, install a shield (F11-0781-04) and two 1000pF capacitors (C52-1710-26) at the final amplifier module M57733 as shown.
  • Page 20 TR-7800 Optional continuous charge for internal batteries The internal batteries for memory back-up charge only when the radio is on. If the radio is used less than 2 hours a day, the internal batteries may not charge sufficiently to retain memory if the main power is disconnected. This optional change may be made to continuously charge the internal batters from the main power source, whether the radio is on or off.
  • Page 21 Memory Channel 7 Indicator Erratic When Memory Channel 7 is selected, the LED may fail to indicate the number 7, although frequency is correctly recalled and all other operations are normal. Cause is incorrect voltage level at Q16 & Q17, and is related to individual differences between these IC's.
  • Page 22 TR-7800, TR-7850 Memory Improvements TR-7800 & TR-7850 memory retention may be improved by the following changes on the control and RX units. Procedure Control unit X53-1180-xx If not already present, add a 470 Kohm ½W resistor (RD14BB2B474J) (R54) on the foil side of the board from connector 11 UP line to ground.

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