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1.4 Internal Connections
With the cover removed, several additional
connections are accessible:
The chipKIT Uno32 Arduino processing card
has an on-board mini-USB connector, accessi-
ble at the rear of the PC board.
On the main PC board are the band selection
jumpers, the speaker enable jumper, and four
pin-type connector blocks that provide access
to interface and monitoring functions of the
processor card.
2. 506 Front Panel
(Refer to the photo above)
2.1 Basic Radio Controls
The power switch is located at the upper left
of the front panel. DC power from the external
power supply is switched to the radio circuit-
ry. The radio is protected from reverse voltage
polarity by protection diodes that are placed
between the power source and switch.
The VOL (volume control) knob at the lower
left of the front panel operates in a typical
manner, controlling the audio level of the
506 / Rebel Users Manual
Part #74482
Printed in USA
headphones or speaker.
At the lower right is the RIT (Receiver
Incremental Tuning) knob, which controls the
frequency offset in the receive mode. The RIT
control has an adjustment range of approxi-
mately ±0.5 kHz, which allows the operator to
tune the receiver to signals that are slightly off
frequency, without changing the transmit fre-
quency. When the indicator on the knob is
centered — aligned with the "I" of RIT — the
radio has a normal receive offset of approxi-
mately 800 Hz.
2.2 SELECT and FUNCTION Pushbuttons
Three functions, and three settings for each
function, are selected using the front panel
FUNCTION and SELECT pushbuttons.
Green, yellow and red LEDs indicate which
function or setting is currently selected.
Using the FUNCTION button, the user may
choose among the following:
BW:
I.F. filter bandwidth
STEP: Tuning step size
USER: User-programmed functions
The SELECT pushbutton chooses the pro-
grammed setting for each function:
Release 1.00 – August 2013
4
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