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World of Ham Radio 1997
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WOHR97_AmSoft_(1997-02-01).iso
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th78a_3.doc
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1997-02-01
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TH78A.3
These are modifications for the Kenwood TH-78a hand held dual band radio.
They were recieved from Kenwood and through the grapevine.
CROSSBAND REPEAT:
The user manual claims the unit will cross band repeat out of the box, this
is not true. For the TH-78a to cross band repeat you must remove diode
D4. Unfortunately you need to reset the CPU which will clear your preset
memories. Write down what you have programmed into the TH-78a and then
hold down the "M" key and power up the unit. All LCD segments should light
up. The CPU is now reset and to use crossband repeat hold the "F" key for
longer than 1 second, then press the "0" key. The decimals in the displayed
frequencies will flash indicating crossband repeat.
EXPANDED FREQUENCY COVERAGE:
The TH-78a will recieve far beyond it's factory settings. It will also
transmit outside it's normal range to some extent (of course thats not legal,
now is it?). By removing diode D5 the frequecy tuning will be expanded. New
ranges include:
121-170 Mhz transmit and receive
400-500 Mhz transmit and receive
300 Mhz receive and 800 Mhz receive only
To get 300 & 800 Mhz coverage place the TH-78a in VFO mode. Press the
"F" key for longer than one second, then press the "BAND" button.
To open the radio remove the battery, then remove the 3 #0 phillips screws
from the back, and the one from the side. Flip over the radio and press up
on the inside of the back cover. Be carefull with the LEDs on top. On the
front portion of the radio you'll find a circuit board with a copper or
brass shield. Depending on the version of the radio the shield may have a
1/2 oval cutout on the lower right side. The memory expansion unit fits
just to the right of the diodes which are under the oval cutout. If there
is no cutout then you must CAREFULLY remove the shield.
CONTINUED IN TH78A.4