th-78a (u.s.a. version) --> th78e (european version) mods.
if you bought a th78a in the usa you don't have the 1750 hz repeater tone access, but you can change that !
apart from the well-known six diodes, the new cpu has 2 green wires.
in order to use the th78a in eu, you must do the following:
first you have to remove d2 for the standard eu bands (144-146 and 430-440 mhz).
now control that the 2 green wires and the 5 other diodes are installed (d1, d3, d4, d5 and d6).
if you need band expantion and components location, please see the mods below.
although the th78a has a special bandpass filter for the us 70cm band, i could not notice a decrease in sensitivity in the eu part of the 70 cm band.
there is a function change for 3 knobs; please see below and also p. 6 and 7 of your instruction manual.
th-78a --> th-78e
---------------------------
lamp --> tone 1750 hz
call --> lamp
tone --> call
now, you can choice between the ctcss tones and the 1750 hz with the following sequence: f + lamp (the new tone !) and then the right rotary encoder to make your frequency choice.
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连接d1, d3, d4, d5 ， d6 即可改为th78e （英文版）。
