Yaesu VX-6R TX Mod
just discovered what appears to
be the "free band" mod for the
US version of the VX-6R. It
requires the removal of one
Here's the procedure:
Turn off the radio and
remove the battery.
Remove the stick-on plastic
cover that fits over the
cutout where the SU-1 goes.
You will see two rows of
solder pads, one row of
eight (with two pads
soldered) and to its right,
one row of five (with no
Counting from the left on
the row of eight pads, go to
the fourth pad and remove
the solder from it.
Replace the SU-1 cover and
replace the battery.
Reset the microprocessor.
The radio will now transmit
from 137 - 174, 222 - 230,
and 420 - 469. The TX LED
lights up in many other
ranges but I have not
checked power output
anywhere but in the ranges I
73, Jim K5QL
|Free band mod for
VX-6R USA version
Click here to view
The 'free band' mod on the
I live in SE Asia, and bought the rig new last week.
Out of the box, it is a TRIPLE band (50/144/430MHZ) rig, and, as stated
in other posts, comes complete with the same 'top blob' antenna as my
VX-7R (the 'top blob' is the screw-on top section for 6m)
After removing solder bridge No.4, it now TX's across a very wide range
of frequencies, including 222 MHz.
A word of caution though!
If you accidentally (or otherwise) TX on a ridiculously high frequency
(500MHz or so) or in the FM broadcast band, the radio shuts off
It will then NOT POWER UP at all, until the DC
adaptor/charger is attached!
I thought I'd killed the rig, and had to wait 8 hours until I got home
to plug in the adaptor.
This 'shut down' also has the very strange effect of completely
discharging the battery (any ideas?).
With regard to non filtering outside of the official bands, this is not
a huge concern in Cambodia, where 147.000 MHz is the 'Icom' band
(Cambodian CB!), and 7-7.100MHz is used by shop owners and others to
talk to relatives around the country and in Vietnam.
You can even buy the Thai 245-246 MHz 5w FM CB HT's here for less than
$50 (80 channel, maybe mod-able to 222 MHz?).
So, in summary, do the mod by all means, but be careful of TX on some
And don't panic if your radio shuts down, just be prepared for a 2-3
wait for the radio to charge again.
I would welcome any ideas on why the battery would completely discharge
Gud DX to all.
The KB2LJJ takes no responsibility for any damage during the modification or for
any wrong information made on this modification.