TS-950sdx VOX Sensitivity Mod
Gotta Trigger dat VOOODOOOO!!!
Read this boring 'Stuff...
These modifications should be accomplished by qualified personnel who
have had enough knowledge and practice in SMD soldering techniques, at the owners risk.
WARNING - YOU DO THE MODIFICATIONS AT YOUR OWN RISK!
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mod errors, or possible mod misinformation via these pages.
The Radio modifications shown here are provided for properly licensed operators only.
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|3.3K ohm - 1ea Needed
1/6 watt Axial Resistor
Digikey - 3.3KEBK-ND ---- CFR-12JB-3K3
It was noted that the VOX Sensitivity was too low after the Transmitter Mods were accomplished on the TS-950sdx.
It was determined that the modified mic input mixer circuit consisting of the 2ea 3.6K resistors was
reducing the drive level to the VOX circuitry and not allowing the VOX to trigger.
By placing a 3.3K Ohm Resistor in parallel with R3 (4.3K) on the VOX Unit CB (X59-1080-01),
it will make the final resistance value 1.92K Ohm, which will increase the Gain of the Op Amp from 213 to 516.
This makes the VOX Gain Control track normally and VOX Sensitivity is back to normal.
Reference the pictures below to locate and add the Resistor on the VOX Unit CB.
This is the schematic for the VOX circuit with the added 3.3K resistor.
The VOX CB is located on the AF Unit
Note the Solder Pads indicated to install the 3.3K Resistor.
This is the resistor installed with the heat shrink.
Another real easy mod.
"TS-950sdx VOX Sensitivity Mod" page designed by the VOODOO GURU