[Elecraft] WM-2 / 100 mod ?

[Mike Harris]

G'day,

Heck of a load of cutting when one small toroid (true Elecrafter style),
one socket, a bit of wire and no cutting will do the -20dB trick.
However, I'm not going die in a ditch over it.

Small JPG available if anyone's interested.

Regards,

Mike VP8NO

<quote>
You will need a 62 ohm 2 - 3 watt resistor MOS or carbon comp type (you
can use a 51 ohm 2 watt and a 10 ohm 1/4 watt in series) and a chassis
mount BNC connector. Mount the chassis mount connector next to the SO239
connector on the back of the dummy load. Remove the circuit board and make
a cut in the circuit trace between the last resistor and the ground screw
at the back right of the board. Then make a cut in the trace between the
4th and 5th resistor from the back right. This will isolate 4 - 1K
resistors in parallel from ground forming a 250 ohm resistor with one side
connected to the dummy load that now has a value of 62.5 ohms. Connect the
62 ohm resistor across the BNC connector and run a short wire from the
isolated side of the 250 ohm resistor (the outside end of the last
resistor in the string on the right. This completes the mod. You now have
a pi network with a 62 ohm power resistor to ground and a 250 ohm resistor
in series with another 62 ohm to ground on the output. The input and
output is 50 ohms and a 20 db reduction in power.
<unquote>