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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
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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.
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Have fun...
Bye
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