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World of Ham Radio 1997
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WOHR97_AmSoft_(1997-02-01).iso
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mods
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kenwood
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th78_7.doc
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1997-02-01
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OWNER ASSUMES ALL RESPONSIBILITY FOR MODIFYING OR USING THESE MODIFICATIONS!
The following mods will provide for Crossband Repeat and Extended Receive/
Transmit on the TH-78A HT.
Diode #4 - Enables Crossband Repeat
Diode #5 - Enables Extended Receive and "out-of-band" TX.
Remove all screws and open radio as explained in the Kenwood manual for
installing the memory expansion module.
On the back cover you will find the memory expansion module socket and a
copper shield just to the left of the memory expansion module.
Under this shield their will be a row of SMC diodes which are unmarked in a
vertical configuration to the lower right portion covered by the shield.
"The original posting from Rich instructed you to remove the copper shield
at its four corners...on my 78 there was a cut-out that exposed the Diodes
therefore removing the shield was not necessary..."
Remove the shield at its four corners with a solder sucker and SMALL iron!
Carefully count down from the 1st Diode in the row to the fourth one and
remove it to enable the Crossband Repeat. "HINT" I found if you "BRIEFLY"
touch the iron to the right side lead while gently pulling up on the SMC
diode it should completely come off without needing to apply heat to the
other side and further risk board damage. I used a pair of right angle
surgical tweezers for this task.
Follow the same procedure as above with the fifth diode to enable the
Extended Receive and Transmit modification.
NOW...put the thing back together...Reset the CPU (yes you will loose all
of your programmed memories)...reset by pressing Function for more than one
second and then "0"..the above modifications are now complete.
Now that you have removed Diodes D4 & D5 the following transmit and receive
frequencies should be available to you:
RECEIVE TRANSMIT
VHF BAND
50-135.995 (AM (NA)
136-179.995 136-179-995
300-399 (AM & FM) (NA)
SUB-UHF
400-511.99 400-511.99
UHF BAND
400-511.99 400-511.99
800-949.9875 (NA)
SUB-VHF
50-179.995 (FM) 136-179.995
To utilize these "mods".......
Crossband Repeat....Press F for 1 second, then 0....the decimal point on
both vhf/uhf should start "blinking"......you can now crossband repeat...
repeat same sequence to disable. CAUTION....she'll get quite warm/hot!
Wideband RX VHF side: You must be in the VFO for this feature to work....
Press F for 1 second, then BAND...on the VHF side this yields 300-400 RX,
pressing F for 1 second and BAND AGAIN will yield 50-179RX.
Wideband RX UHF side: Again you must be in the VFO for this feature to
work..Press F for 1 second, then BAND...on the UHF side this yields 400-512
RX, pressing F for 1 second and BAND AGAIN will yield 800-950 RX.
300-Mhz Band AM/FM switching....hold down the VFO key and switch the POWER
on to switch between AM and FM..
You can also "Channelize" the display..ie...CH1, CH2 instead of the actual
frequency showing...hold down the 3 key...turn power on....
For those of you who use the Paging feature....Answerback feature (during
paging reception)...Hold down the MHZ key and switch POWER ON to turn this
function on and off.
Game function....Hold down the M and PTT key...switch POWER ON.
There are other versions of these mods in circulation...BE CAREFULL...I've
seen mods out there that looked right but further reading showed that the
mods mentioned were for the TH-78"E"....not sure that those mods would work
properly with the 78A...
Anyway...I hope this information will help...I've tried to be a brief as
possible but still get the point across...AGAIN...THIS IS INFORMATION THAT
I HAVE PULLED FROM A PACKET MESSAGE...I'VE CHANGED SOME OF THE WORDING AND
ADDED MY OWN THOUGHTS TO HELP CLEAR UP SOME OF THE CONFUSION THAT MIGHT
OCCUR..THESE MODS HAVE WORKED FOR ME BUT "NO GUARANTEES THAT THEY WILL WORK
FOR YOU"...THEY SHOULD BUT "PROCEED AT YOUR OWN RISK...OWNER ASSUMES ALL
RESPONSIBILITY FOR MODIFYING OR USING THESE MODIFICATIONS......GOOD LUCK!!
ROGER/N5IFH....