Plowboy's export Radio Swing mods
EPT 3900, EPT 6900,
PC999, PC833,
EPT069610Z, PC965, and PC893 boards.
New!! For Cobra 200GTL click here

You may have seen a different version
of this mod using R238 (or R264). While
that mod does produce some swing, it doesn't
swing up very high. The mod on this page works
much better, allowing you to set the dead
carrier to whatever you want.

The radio shown in the mods on this page
is a GAlaxy 77, but it works with
any export radio that has either the
EPT3600, EPT6900, PC833 or PC999 boards.
If you're not sure what board your radio has,
just look at the foil side of the board for
the number, as shown in the pic below:

EPT 3600 board swing mod

This mod only requires a 1N4001 diode,
some good electrical solder,a 25 watt iron,
and some thin wire.
The first step is to locate R240 and unsolder
and remove it. Save R240 as will be re-used.
For the EPT 3600 boards, the pictures below
show you what point to unsolder







There's not enough room to solder in a diode
and the resistor back in the empty holes
where R240 was, so get 2 pieces of thin wire
about 6 inches long and solder the wire into
the empty holes. The get R240 and solder it
to the banded end of the diode. Solder the
diode and resitor to the wires exactly as
shown in the drawing. Wrap tape around the
diode and resistor so they don't short out.
Now you can set the dead carrier with VR-13,
I like to set it 2 watts and you should have
about 10-20 watts of swing.

EPT 6900 Swing mods

This mod only requires a 1N4001 diode,
some good electrical solder,a 25 watt iron,
and some thin wire.
The first step is to locate R266 and unsolder
and remove it. Save R266 as will be re-used.
For the EPT 6900 boards, the pictures below
show you what point to unsolder





There's not enough room to solder in a diode
and the resistor back in the empty holes
where R266 was, so get 2 pieces of thin wire
about 6 inches long and solder the wire into
the empty holes. The get R266 and solder it
to the banded end of the diode. Solder the
diode and resitor to the wires exactly as
shown in the drawing. Wrap tape around the
diode and resistor so they don't short out.
Now you can set the dead carrier with VR-14,
I like to set it 2 watts and you should have
about 10-20 watts of swing.

PC999 board swing mod

This mod only requires a 1N4001 diode,
some good electrical solder,a 25 watt iron,
and some thin wire.
The first step is to locate R262 and unsolder
and remove it. Save R262 as will be re-used.
For the PC999 boards, the pictures below
show you what point to unsolder





There's not enough room to solder in a diode
and the resistor back in the empty holes
where R262 was, so get 2 pieces of thin wire
about 6 inches long and solder the wire into
the empty holes. The get R262 and solder it
to the banded end of the diode. Solder the
diode and resitor to the wires exactly as
shown in the drawing. Wrap tape around the
diode and resistor so they don't short out.
Now you can set the dead carrier with VR-13,
I like to set it 2 watts and you should have
about 10-20 watts of swing.

PC833 board swing mod

(AX-144, 146-GTL)

This mod only requires a 1N4001 diode,
some good electrical solder,a 25 watt iron,
and some thin wire.
The first step is to locate R212 and unsolder
and remove it. Save R212 as will be re-used.
For the PC833 boards, the pictures below
show you what point to unsolder





There's not enough room to solder in a diode
and the resistor back in the empty holes
where R212 was, so get 2 pieces of thin wire
about 6 inches long and solder the wire into
the empty holes. The get R212 and solder it
to the banded end of the diode. Solder the
diode and resitor to the wires exactly as
shown in the drawing. Wrap tape around the
diode and resistor so they don't short out.
Now you can set the dead carrier with VR-10,
I like to set it 2 watts and you should have
about 10-20 watts of swing.

swing mods for other radios: