KB2LJJ Radio Mods Database and Manuals
Vertex VX-110 & VX-150 Mods www.r6-ru4montesecchieta.it
IZ5CCV
MARS/CAP modification only for VX-150R 140-174 MHz
Open the Radio by taking the battery off lift the black cover off the one say's ni-cd disposed of properly then take the 2 silver.
Things and then the one black one one the top left not the under the belt clip then the 2 nuts under the knobs pull the knobs and rubber things and the ANT off, gently slide the top cover off.
Remove R1275 (see picture)
Then put the radio back together and go be careful and not get a solder bridge!!!!
Expanded Transmit for the Vertex VX-110 & VX-150
Remove the antenna, belt clip, battery, and top volume & squelch/knobs
Remove the the black sticker (the one with the Ni-Cd battery disposal warning) and the small "sub-board". See Fig 1 *removing the sticker/ sub-board reveals two small Phillips screws. http://www.kb2ljj.com/data/yaesu/vx-150r.htm (1 di 5)08/09/2009 23:02:38
Fig 1 - Sub-Board
KB2LJJ Radio Mods Database and Manuals
Remove the two screws that were under the sticker and sub-board, and remove the top LEFT screw - leaving the right
Screw alone. See Fig 2
Fig 2 Remove screws
Remove the rubber grommets under the volume & knob controls, and using a pair of hemos or small needle-nose pliers, remove the nuts for the volume & squelch/knob.
*Photo shown with nuts and case removed
Carefully slide the front and back case apart and remove the rubber piece around the mic element.
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KB2LJJ Radio Mods Database and Manuals
Fig 3
Fig 3
For Mars/Cap(140-174Mhz TX) remove R1275, and solder it to the blank solder pads labeled R1274 - Fig 3.
For Free band (100-200Mhz TX) remove R1275 - Fig 3.
R1274 R1275 Transmit Coverage http://www.kb2ljj.com/data/yaesu/vx-150r.htm (3 di 5)08/09/2009 23:02:38
KB2LJJ Radio Mods Database and Manuals
Blank
Soldered
Blank
Soldered
Blank
Blank
144-148Mhz (Factory Config)
140-174Mhz (mars/Cap)
100-200Mhz* (Free band)
*The VX-110 & VX150 can be opened for 100-200Mhz, but the radio's circuitry is not wide-banded enough to cover the entire 100-200Mhz spread. When the radios display starts flashing/blinking, this means the radio's VCO is out-of-lock and no receive or transmitting is possible. A typical radio should RX/TX from approx. 125-180Mhz when the free band mod is performed.
Reassemble the radio carefully. Most of the time resetting the radio is NOT necessary, but have a backup of your frequencies just in case, because the radio will reset itself most of the time after a modification is made.
Info:
I have noticed a major bug in the memory channels. This bug has to do with memory channel #1. Example: Lets say you program: ch. #1 with
147.000, and ch #2 with 154.570, and the last channel (I will call ch # 200) in your memory bank with 144.000
So!!!!!
CH 200 144.000
CH 1 147.000
CH 3 154.570
Now, go to memory channel 1, and it will be 147.000, but rotate the knob to memory channel 2 (154.570) and back to 1, and the memory contents from CH 2 are now in CH1, which is 154.570 on memory channel 1(should be 147.000). The same thing will happen if you go to memory channel 200, and rotate knob one click to to memory CH 1, the contents from CH 200 will be on CH 1. This bug does not rewrite the memory contents in CH 1. This bug basically moves the frequency from the memory channel below CH 1, and above CH 1 to memory CH 1 while your rotating the knob through the memory channels. Scanning seems OK, and is not affected by the memory CH 1 bug.
Solution......
Solution #1 for this is to make CH 200, CH 1, and CH 2 all to the same frequency. OR
Solution #2 set the "edge beep" to on. <---thanks goes to Susie for this info!! http://www.kb2ljj.com/data/yaesu/vx-150r.htm (4 di 5)08/09/2009 23:02:38
KB2LJJ Radio Mods Database and Manuals
My VX-150 with the LCD display LED changed to Blue. The original LED was removed and replaced with a blue SMT LED (1206 size).
R1239 (220Ohm) was removed and replaced with a 0 Ohm resistor.
ATTENTION
The KB2LJJ takes no responsibility for any damage during the modification or for any wrong information made on this modification.
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