MFJ-464 Instruction Manual CW Keyer/Reader
18
The Paddle
Using the MFJ-464 with a Paddle
Plug an iambic or single lever paddle into the Key Input jack of the MFJ-464. A _-inch stereo
phone plug and a two-conductor shielded cable should be used. If separate shielded cables are
used, the two shields should be tied together and connected to ground. The dot wire should be
connected to the tip of the plug and the dash wire to the ring. Begin sending code using the
paddles. If you would like to change speed, sidetone or weight, see the sections pertaining to
these commands.
The iambic paddle has a unique feature that the single lever paddle does not have. Notice that
the two paddles are independent and can be squeezed together. Both the dot and dash contacts
touch the chassis, therefore ground. The MFJ-464 senses this happen and uses it as a separate
keying mode.
Iambic keying has two modes: A and B. When a squeeze is released during an element (dot or
dash), iambic B adds an opposite element. Iambic A just finishes the element in progress and
does not produce a following alternate element.
The dot and dash memories make sending easier. The memories allow the user to key a dot
before the completion of a dash and vice versa. This feature can be checked by setting the keyer
to the lowest speed and tapping first the dash lever and then the dot lever before the completion
of the dash. The keyer will provide both the dash and the dot. The dash memory can be checked
in a similar manner. The dot insertion feature allows the user to insert a dot by tapping the dot
lever while holding the dash lever in. The dash insertion feature allows the user to insert a dash
while holding the dot lever in. The iambic operation allows sending alternate dots and dashes
when both levers are squeezed. The first lever contacted will determine whether a dot or dash
occurs first.
Note: It is recommended the Farnsworth mode be disabled when sending with the paddle.
When Farnsworth mode is enabled, the paddle will send code at the Farnsworth speed,
not the overall speed.
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