Kenwood TR 7800 Скачать руководство пользователя страница 28

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Содержание TR 7800

Страница 1: ...TR 7800 TRIO KENWOOD VHF TRANSCEIVER ...

Страница 2: ...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 ...

Страница 3: ...r 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...

Страница 4: ...vailable 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 ...

Страница 5: ...ally 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 pres...

Страница 6: ...put 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 ...

Страница 7: ...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 i...

Страница 8: ...ft 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...

Страница 9: ...e 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...

Страница 10: ... 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 equip...

Страница 11: ... any other key unitill the correct frequency is input e The transceiver holds the previous frequency until the new frequency is input 4 Input the shift mode Press the key the indication changes from S to 5 Store the frequency in the memory Press the M key A tone will sound indication data entry Change the channel and input other frequencies in the same manner Note 1 If you wish to change the shift...

Страница 12: ...16 4 Changing memory frequencies If you wish to change memory frequency store a new frequency using the above procedures The old frequency is erased when the new frequency is stored 3 3 SCAN Busy stop Operation The SCAN operation is classified into keyboard scan memory scan and priority channel scan For SCAN operation the squelch control should be advanced to the threshold point See 3 6 Squelch KE...

Страница 13: ... the TX shift indicator 3 does not alter the indication 3 6 SQUELCH To eliminate the noise at no signal condition turn the squelch slowly clockwise until the noise disappears and the BUSY indicator goes off threshold point Turn to an empty channel The BUSY indicator will light and the speaker will operate when a signal is received The squelch control is also used for scan operation control If the ...

Страница 14: ...ehicle battery or when jump starting a dead battery ALWAYS disconnect the power lead from the back of the transceiver 4 4 Ordering Spare Parts When ordering replacement or spare parts for your equipment be sure to specify the following Model and serial number of your transceiver Schematic number of the part Printed circuit board number on which the part is located Part number and name if known and...

Страница 15: ... 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 ...

Страница 16: ...ove bottom cover 4 screws From the Control unit X53 1180 xx unplug the rear mounted connectors 8 11 Remove 6 screws from the board Swing the unit forward Install a 470K ohm 1 8 watt or larger resistor from connector 11 UP pin to ground microprocessor pin 35 PA2 port Space is limited Be certain not to create a solder bridge when installing the resistor Reverse steps 4 1 for reassembly ...

Страница 17: ...it X55 1270 10 part L10 or TR 9000 RX unit X55 1260 11 part CF1 To install desolder the original filter and clear the second set of holes for the optional filter Solder the new filter in place Be sure all pins are actually soldered and that there are no solder bridges between pins or across the printed circuit board Clip the pins flush to the board and reinstall the circuit board Note Squelch oper...

Страница 18: ... Remove and save R51 22 Kohm located between IC s Q19 and Q28 Q28 pin 5 Resolder this 22 Kohm resistor to Q28 pin 5 and solder another 22 Kohm resistor to Q28 pin 9 Using a short piece of hookup wire extend these connections t the REV switch as shown Connect a line from the center switch contact to the original feed point of R51 which is the B3 line To reassemble reverse steps 4 through 1 To opera...

Страница 19: ...e 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 On the RX unit X55 1270 10 add three additional 1000pF caps c52 1710 26 and one additional 470pF cap C52 1747 16 as shown ...

Страница 20: ...Cut the foil at the input to Q27 and connect via a 3 4 lead to the BB terminal on connector 1 Battery charge current will be 15mA nominal Note The radio should be connected directly to the vehicle battery and not through the ignition switch Turn the radio off before connecting or disconnecting the power cable For early units Before closing the case check clearance from the back of the battery case...

Страница 21: ... level at Q16 Q17 and is related to individual differences between these IC s Correction is by changing one resistor value on the control unit On the control unit X53 1130 xx replace R38 from 3 9 Kohm to a 1 8 Kohm resistor RD14CB2E182J No adjustments are required This change should be perform only as necessary and applies to units before serial number 205xxxx Installation time for this procedure ...

Страница 22: ...2 40 4V 10 Zener Check D3 for leakage which would load the MB line voltage below it normal 5 2 V DC setting RX unit X55 1270 xx TR 7800 Change R94 from 56 ohm to 150 ohm W RD14CB2E151J TR 7850 Change R94 from 100 ohm to 150 ohm W RD14CB2E151J Cut the foil at the input to Q27 and connect Q27 input to the BB terminal Connector 1 for constant battery charge at Power switch Off and floating battery ch...

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Kenwood TR 7800, Руководство пользователя

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