DIODES	RX	RX	TX	TX	Default	RX	RX	TX	TX	Default	2m Offset	70cm Offset	Tone 1750	Skycommand & Remote	VHF Narrow	REMARKS / 118-136MHZ
OXXX	136	174	136	174	144	400	480	400	480	430	+/-5.7	+/-10	?	?	?	CHINA / N
XOOO	144	146	144	146	144	430	440	430	440	430	.6	1.6, -7.6	Yes	No	Yes*	EUROPE GENERAL / N
XOOX	136	174	136	174	144	400	480	400	480	430	.6	1.6, -7.6	Yes	No	Yes*	EUROPE EXPANDED RECEPT./Y
XOXX	136	174	144	146	144	400	480	430	440	430	.6	4.6, -7.6	?	?	?	EUROPE EX. REC. UK/Y
XOXO	136	174	144	146	144	400	480	432	438	432	.6	1.6	?	?	?	DENMARK/N
XXOO	136	174	144	146	144	400	480	432	438	432	.6	1.6	?	?	?	DENMARK EXPANDED REC./Y
XXXO	144	146	144	146	144	430	440	430	440	430	.6	5	?	?	?	TAIWAN/N
OOOO	136	174	144	148	144	400	480	430	450	440	.6	5	No	Yes	No	USA - CANADA/Y
OOOX	136	174	142	152	144	400	480	420	450	440	.6	5	No	Yes	No	USA - CANADA MARS MOD/Y
OXXO	136	174	136	174	144	400	480	400	480	440	.6	5	No	Yes	No	USA-CANADA EXPAND TX +/Y
OXOX	136	174	142	152	144	400	480	420	450	440	.6	5	No	Yes	No	USA-CANADA MARS MOD +/Y
OXOO	136	174	144	148	144	400	480	430	450	440	.6	5	No	Yes	No	USA-CANADA ?????/Y
OOXO	144	148	144	148	144	430	440	430	440	430	No	5	No	No	No	OVERSEAS GENERAL /N
OOXX	136	174	136	174	144	400	480	400	480	430	No	5	No	No	No	OVERSEAS GEN. EXPAND TX/Y
XXOX	136	174	144	148	144	400	480	430	440	430	.6	5	No	No	No	AUSTRALIA/Y

*TH-D7E Hardware Required for this function

The above changes to diode configurations can change a TH-D7A to a TH-D7E or vice-versa.

(Note: In my opinion, surgery on your radio may bust it, but only if you screw up. If you are a screw up, then surgery on your radio will probably bust it.)

However, Bob WB4APR writes:

Here is what I have gathered from a varitey of sources. This is at your
OWN RISK. Surgery on your radio will probably bust it and make it out of
warranty. But if you must tinker, here is what some people have figured
out...

Compare this to previous posts, there may be minor differences...

In general, the TH-D7A/E can be modified to all configurations.... But
the hardware is different between D7E and D7A because the UHF SAW
filter frequency is different and the narrow deviation filter are
different.

The D7A uses a 438-450 SAW filter for UHF and wide band LC filter
for 400-438 and 450-480MHz.

The D7E uses a 430-440 SAW filter for UHF and wide band LC filter
for 400-430 and 440-480MHz.

Skycommand and Remote access are only in the USA modes.
The Narrow deviation circuit is only in the TH-D7E hardware.

If you want to modify the TH-D7E to the USA type, and you want to use
UHF, you have to replace the SAW filter or the radio becomes deaf around
430-435MHz. But you DO get Skycommand and Remote Access in exchange for
deaf 430-435MHz.

If you want to modify the TH-D7A to a non USA type, and you want to use
UHF band, you have to replace the SAW filter. Otherwise, the radio
becomes deaf around 445-450MHz. You can use the 1750 tone burst and you
will see the VHF narrow menu (but it does not switch to narrow, since the
hardware is not there).

de WB4APR, Bob