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Subject: More TH 78 Mods



          Hello all,



This is again the TH-78 mods i archived, original is from

 PE1ACG


If you have other mods, please send them to me to complete my

archives, THANKS.



Frederic,

                FC1JSO


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





          SECRET FUNCTION MANUAL OF THE KENWOOD TH-78x PORTO



TH-78E RX EXPANSION (ON)



 Press PTT + VFO, then POWER ON.

 New RX ranges after this modification:

 VHF Band  50 - 136 Mhz only AM)

          136 - 174 Mhz (only FM)

          320 - 390 Mhz (AM + FM) see note below.

 UHF Band 405 - 510 Mhz (only FM)

          800 - 950 Mhz (only FM)



 VHF Band:



           _________      _____      _________

     ---->I AMATEUR I====I AIR I--->I 320 Mhz I_____

     I    I_________I    I_____I    I_________I     I

     I______________________________________________I





 UHF Band:



           _________      _________

      --->I AMATEUR I--->I 900 Mhz I_____

     I    I_________I    I_________I     I

     I___________________________________I





 Note:Receiving mode of the 340 Mhz Band can be switched fr{m FM to

       AM by press and hold VFO key then POWER ON.





TH-78E RX EXPANSION (OFF)           _____

 Reset your TH-78E by pressing the I  M  I key, when powering ON

                                   I_____I



TH-78E TX EXPANSION



 Remove the diode D6 from the control unit.

 New TX ranges after this modification:

 VHF Band  136.000 - 174.250 Mhz (FM)

 UHF Band  400.000 - 493.000 Mhz (FM)





TH-78E UHF BAND 432-438 Mhz LIMITED RANGE



 Remove the diode D3 from the control unit.





TH-78A/E EXTENDED FUNCTION



 You can change the frequency range and use various secret function of

 the TH-78A/E by changing his destination. A secret funcion is

 available without modification.





Destination modification



 The destination is determined by diodes D2,D3,D5, and D6. Change the

 destination with reference to table 2. For information about setting

 the destination by diode, see the destination column of table 2.



 The diodes are protected by a shield plate. Remove the shield plate,

 then remove the appropriate diodes.



 Refere to your schematic diagram TH-78A/E 2/2

 Control Unit Board X53-342X-XX A/5





 __________________  Cupper shield plate

:                 :/                      Table 2

: ___________     :            ____________________________

:I           I    :           I            I   I   I   I   I

:I   CPU     I    :           I DestinationID2 ID3 ID5 ID6 I

:I   IC 7    I    :           I------------I---I---I---I---I

:I           I    :           I 0-00 (J)   INo INo INo IYesI

:I___________I    :           I------------I---I---I---I---I

:                _:_           I 0-11 (K)   IYesIYesIYesIYesI

:               I_:_I D1       I------------I---I---I---I---I

:               I_:_I D2       I 0-21 (M)   IYesINo IYesIYesI

:               I_:_I D3       I------------I---I---I---I---I

:               I_:_I D4       I 0-22 (M2)  IYesINo IYesINo I

:               I_:_I D5       I------------I---I---I---I---I

:________________I_:_I D6       I 0-71 (X)   INo IYesINo INo I

                                I------------I---I---I---I---I

     Control unit               I 2-71 (E)   INo IYesIYesIYesI

                                I------------I---I---I---I---I

                                I 2-72 (E2)  INo IYesIYesINo I

                                I____________I___I___I___I___I



Secret functions after modification

 The following functions are added if you modify the destination. See

 the appropriate description for details.



Frequency range change

 Change the diodes (D2,D3,D5, and D6) as shown in the destination

 column of Table 2.





Cross-band repeater       _____                                _____

 Remove D4 and press the I  F  I key for one second, then the I  0  I

 key, to turn this       I_____I function ON or OFF.          I_____I



Answerback function (during paging reception)

                _____

 Hold down the I Mhz I key and switch the POWER ON to turn this

 function      I_____I ON or OFF.





300-Mhz band AM/FM switching

                _____

 Hold down the I VFO I key and switch the POWER ON to switch between

 AM and FM.    I_____I





VHF expansion band

            _____                                ______

 Press the I  F  I key for one second, then the I BAND I key,to change

 the band. I_____I                              I______I





UHF expansion band

            _____                                ______

 Press the I  F  I key for one second, then the I BAND I key,to change

 the band. I_____I                              I______I





Channel display mode

                _____

 Hold down the I  3  I key and switch the POWER ON to change te

 frequency     I_____I display to the memory channel.

 # If you remove D1, only the channel is displayed. Normally, leave D1

 # in.





Clone function  _____

 Hold down the I  0  I key and switch the POWER ON to use this

 function.     I_____I





Secret function available without modification.(Game function)

                _____       _____

 Hold down the I  M  I and I PTT I key and switch the POWER ON to use

 this function.I_____I     I_____I





Cross-band repeater

 When one band becomes busy, the cross-band repeater function retrans-

 mitts the received signal on the other band. As soon as the BUSY

 signal for the receiver band goes low, the transceiver enter receive

 mode on both bands.

 Note 1:DTTS and paging are not checked.

 Note Y:If TONE of the transmitter is on, a subtone is output.

 Note 3:If the transmitter does not output a subtone, CTCSS is

         checked.





Cross-band repeater ON/OFF

 You can turn the cross-band repeater ON and OFF by pressing the

  _____                                _____

 I  F  I key for one second, then the I  0  I key.

 I_____I                              I_____I

 The dot indicating Mhz on the frequency display (both bands) flashes

 while the cross-band repeater function is on.

 Note 1:The cross-band repeater does not turn on during dual watch.

 Note 2:If you enable the cross-band repeater when the bell function

         is on, the bell function is turned off and the cross-band

         repeater function is turned on. You can turn the repeater on

         only if the bell function for the operation band is off.

 Note 3:A dedicated jumper is used to select whether to use the

         cross-band repeater.

 Note 4:The timeout timer is set to three minutes.





Cross-band repeater operation



 Operation band BUSY                band:change            band:change

                   _____________________:_______}______________:______

                                        :                     :

                      ______    _       :_____________         :_

 Non)operation band  I      I  I I      I             I        I I

 BUSY              __I      I__I I______I             I________I I____



                      ______    ___      _____________          ___

 Operation band      I      I  I   I    I             I        I   I

 transmission      __I      I__I   I____I             I________I   I__



                             ->I---I<-                       ->I---I<-

                               500 ms                          500 ms



Answerback function

 If the transmitter pages a receiver, it does not know whether the

 receiver has received the paging signal. When the answerback function

 is ON, the receiver returns a code automatically if the paging code

 matches to indicate that it has received the paging signal. The

 transmitter can thus confirm that the code it sent was actually

 received.



Operation

 If the paging code matches and the busy signal goes low, the receiver

 returns a code. If the paging code does not match, the receiver does

 not return a code. The answerback function is related to the bell

 function:if you turn the bell function on when the answerback

 function is on, the answerback function works; If you turn the bell

 function off, the answerback function does not work. If the answer-

 back function is off, only the bell function can be turned on or off.

 To turn the answerback function on and off, hold down the  _____ key

 and switch the POWER ON.                                  I Mhz I

                                                           I_____I



 Note :This function is available only if reception is

        modified.



__________                                      ______________________

BUSY      I                                    I

          I____________________________________I

Receive   :   _   _   _   _   _   _   _       :

code      :  I I I I I I I I I I I I I I      :

__________:___I I_I I_I I_I I_I I_I I_I I______:______________________

          :  :                        :     :

          :  :      Paging code       :     :

          :  :<----------------------->:     :

        ->:---:<-250ms(450/750ms for shift, split channel)

                                               :

                                               :

          .....................................:

          :

__________:                                       ___________________

TX     ON I                                       I

          I_______________________________________I

          :   _   _   _   _   _   _   _

          :  I I I I I I I I I I I I I I

__________:___I I_I I_I I_I I_I I_I I_I I_____________________________

Transmit  :  :                        :

code      :  :      Paging code       :

          :  :<----------------------->:

        ->:---:<-250ms(450/750ms for shift, split channel)

______________                           _____________________________

Microphone OFFI                         I

              I_________________________I





VHF expansion band

 You can change the reception of AMATEUR band, AIR band, and POLICE

 band by pressing the   _____  key for one second, then the  ______

                       I  F  I                              I BAND I

                       I_____I                              I______I

 key, when the VHF band is VFO.



  _______________________________________________

 I                   I        Police band        I

 I===================I===========================I

 I        Step       I    10, 20, 12.5, 25 Khz   I

 I-------------------I---------------------------I

 I  Frequency range  I   300.000 -- 399.995 Mhz  I

 I-------------------I---------------------------I

 I Initial frequency I        340.000 Mhz        I

 I___________________I___________________________I





UHF expansion band

 You can change the reception of AMATEUR band and CAR TELEPHONE band

 by pressing the  _____  key for one second, then the  ______ key,

                 I  F  I                              I BAND I

                 I_____I                              I______I

 when the UHF band is VFO.





  _______________________________________________

 I                   I       Car telephone       I

 I===================I===========================I

 I       Step        I        12.5, 25 Khz       I

 I-------------------I---------------------------I

 I  Frequency range  I  800.000 - 949.987.5 Mhz  I

 I-------------------I---------------------------I

 I Initial frequency I        800.000 Mhz        I

 I___________________I___________________________I



 Note 1:Program scan cannot be performed over bands. It can only be

        performed within each band.

 Note 2:You cannot change the band in MR and CALL modes.

 Note 3:The AIR band frequency range is shown below. It is contiguous

        in the VHF amateur band frequency range.

 Note 4:The initial step is the same as the VHF amateur band step.

 Note 5:If the AIR band is received as the UHF subband, FM reception

        is performed.

 Note 6:The step is the same as the VHF band step.

  _________________________________________________

 I                   I             Air             I

 I===================I=============================I

 I        Step       I 5, 10, 15, 20, 12.5, 25 Khz I

 I-------------------I-----------------------------I

 I  Frequency range  I     50.000 - 135.995 Mhz    I

 I___________________I_____________________________I



Channel display mode

 Select the channel mode by cutting D1 on the CONTROL UNIT.





 If you cut D1 on the CONTROL UNIT, you can use channel display mode

 only. You cannot change it to normal display mode from the panel.

 If you do not cut D1 on the CONTROL UNIT, you can change between

 channel display mode and normal display mode by holding the  _____

 key and switch the POWER ON.                                I  3  I

                                                             I_____I



 Note :Memory channels for both bands must contain frequencies. If

       nothing is stored in memory, an error occurs.











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



Have fun...



Bye










SOURCE: The QRZ Windows Ham Radio CDROM



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