在网上找到一个79a改79e的，英文的，看的不太明白，哪位朋友指点一下呀。下面是英文原文
th-79 wideband-rx only
yeahh, this is the modification you all have been wating for !!!
recently i purchased a th-79a in the united states having the idea that is
was possible to convert it to a model th79e.
after some research i discovered that it was possible to make a th79e.
inspired by this succes i wanted to have the extra rx possibilities, and
after the so called 'green-wire' cut i had the wanted rx but also tx. because
of government regulations this extra tx it is not allowed in holland. so i
searched a little farther and fixed the job.
the following modification is called the e3 modification.
this modification gives you:
tx 430-440 mhz and tx 144-146 and rx for all built in frequencies that the
hardware of your radio is capable to receive.
what to do ?
find some one that can manage very tiny smd components. cut the green wire
and change your diodes under the cpu so that it looks like this:
x x - - x x x x x
r d d d d d d d r
5 3 3 3 3 3 3 3 4
0 0 0 0 0 0 0 0 0
2 2 3 4 5 6 7 8 2
x = component present
- = no diode here
r = resistor
d = diode
r 402 and r 502 are only displayed for reference.
hint ! in the schematic diagram you received with your radio there is also a
diode program diagram wich lists the e3 version and other versions also.
for example the k version is the american version. please note that in this
table d 302 and d 305 are not drawn, and have to be present.
background information:
i chose for the e3 type because i had a modification note of the tm 733.
in this note i read what the different type's (letters) had for operating
rx/tx frequency's.
so if you want to find out what the other types would do see if you can put
your hand on this tm 733 modification note.
warning:
the radio you purchased is very expensive, don't give me the blame if
something does not work.
if you diside to make this modification is on your risk only !!!
this is a specialist job be ware of the tiny components !!
for stations who live nearby i can give assistence.
remarks
only the normal th79e hardware is capable of receiving 900 mhz.
this is not possible for the other versions.
finaly
i hope you will enjoy these "hidden" options.
in case i do discover more of them, i will share them with you.
on the other hand, if you have further information on hidden options and/or
modifications i would be please to know them as well.
