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Speaker
Select
Program-
mable
Control
Sidetone
Adjust
and sleeve. If the user wishes to add a keyer
as part of the Arduino programming, both tip
and ring connections are accessible to the
processor for the paddle inputs.
3.2 Sidetone Level Adjustment
A sidetone level adjustment potentiometer can
be reached via an access hole on the left side
panel (visible in the photo at the beginning of
this manual).
3.3 User-Programmable Potentiometer
An additional internal potentiometer is avail-
able for user programming (e.g., CW keying
speed), and is accessible via a second access
hole on the left side panel.
506 / Rebel Users Manual
Part #74482
Printed in USA
Processor
Connections
4. 506 Internal Adjustments and
Connections
(Refer to the photo above)
4.1 40/20 Meter Band Selection
To select the desired band, the user must move
five (5) jumpers located in the right rear area
of the main PC board. The outer pins of the 3-
pin headers are labeled "20M" and "40M" to
indicate the proper position of the jumper. Be
sure that all five jumpers are in position for
the desired band before applying power.
4.2 Speaker/ Headphone Selection
A 2-pin header and jumper for speaker/head-
phone selection is located in the left rear por-
tion of the PC board. The jumper is placed
Release 1.00 – August 2013
8
Band
Select
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