Table of Contents
Advertisement
(29) RF GAIN
The RFGAIN control is selectable
independently for each receiver. Press
RFGAIN and adjust the MULTI knob for a
value between 0 and 100%. RF gain is
used to limit receiver sensitivity to minimize
extraneous noise under large-signal
conditions.
Selecting RF GAIN and turning value down
using the MULTI knob will limit overall
receiver sensitivity for both the analog and
DSP receiver stages.
DSP receiver gain alone can be limited via
the menu system by the use of the threshold
function in programmable AGC, if desired.
See the section in Chapter 4 of this manual
titled "Optimal Uses of ORION Receiver
for Weak-Signal DXing and Contesting"
and the description of (RX) RX MENU
elsewhere in this manual.
(30) SPOT
ORION II is equipped with adjustable CW
sidetone and autotracking CW offset. This
value can be adjusted in the menu system
or via the front panel.
Pressing and holding the SPOT button will
produce a tone at the value set by the
operator (default is 700 Hz). This tone can
be matched to the received tone of an on-air
CW signal to achieve zero beat. Press and
hold the SPOT button while tuning in a CW
signal. When the tones match, you are on
the proper frequency.
The SPOT value can be adjusted by
pressing and holding the SPOT button while
turning the MULTI knob. It is adjustable
from 300 to 1200 Hz. This value is also
adjustable via the menu system. See the
description for (CW) CW MENU in
Chapter 3.
(31) STEP
The tuning step size for each receiver is
adjustable in seven different steps, 1, 10,
100 Hz and 1, 5, 10, and 100 kHz.
566 manual
Part #74410
Printed in USA
Press STEP. A submenu with the seven
values will appear, use buttons 28 through
34 to select a particular value. STEP size is
adjusted per receiver depending on which of
the MAIN RX or SUB RX buttons located
between the two main tuning knob is lit.
There is also a quick step size jump feature
accessible by pressing a lit MAIN RX or
SUB RX button (see (55) SUB RX and (56)
MAIN RX).
(32) SWEEP
The main receiver on the ORION II is
equipped with a real-time band sweep
display. A separate adjustment in the
menus allows for the sweep range to be
adjusted in five different increments; the
default is 72 kHz. See the description in
Chapter 3 under (RX) RX MENU.
Press the SWEEP button. A display of
activity will appear at the bottom of the
screen, updating several times per second.
The center of the sweep scope has "0"
above it to indicate kHz offset from center
where a signal appears. The other numbers
appearing at the top of the sweep scope to
the left and right of the "0" are the distance
in kHz from the dial frequency.
To tune to a signal seen on the spectrum
scope, turn the main tuning knob on the
main receiver towards the signal seen on
the scope. If the signal is to the left on the
screen, turn the knob counterclockwise
(downward in frequency). If the signal is
shown to the right, turn the knob clockwise
(upward in frequency). The sweep will
hesitate or run slower as the main tuning
knob is turned toward the signal of interest.
(33) AGC
ORION II has five selectable AGC settings
that can be used independently on each
receiver. The available options are OFF,
SLOW, MED, FAST, and PROG.
To select AGC setting, press the AGC
button to cycle through the available
choices.
AGC settings of SLOW, MEDIUM, FAST,
and PROGRAMMABLE have a number of
parameters that are user adjustable to place
Version 4 – October 2006
15
Advertisement
Table of Contents
