Subject: More TH 78 Mods Hello all, This is again the TH-78 mods i archived, original is from PE1ACG @ ON4UBO i received on packet. If you have other mods, please send them to me to complete my archives, THANKS. Frederic, FC1JSO @ stna7.stna.dgac.fr ------------------------------------------------------------------ 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 Copied from the QRZ! Windows Ham Radio CDROM