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transmitted signal is 200 Hz on the low end
to 3200 Hz at the high end. Moving L.F.
Rolloff to 100 Hz would move the transmit
passband to 100 Hz to 3100 Hz for a 3000
Hz bandwidth. The available values are a
minimum of 50 Hz to a maximum of 300 Hz.
TX Audio Source allows the radio to have
audio input through either the front panel
mic jack or via the AUX input on pin 1 of the
rear panel AUX I/O connector. The
available choices are MIC, AUX or BOTH.
H/W Mic Gain is used for giving the
transceiver additional pre-A/D converter mic
gain if needed. Some microphones, like
dynamics, have relatively weak output and
require more gain to function with the
ORION II than a comparable electret
condenser. There is 18 dB of range usable
with this control in 0.5 dB steps. Because
this mic gain setting is before the A/D
converter it is much easier to overdrive the
radio and send it into distorted SSB transmit
than with the DSP mic gain control. We
recommend using a modest amount of gain
with the H/W Mic Gain control and using
DSP mic gain for adjustment of exact
desired level. Please note that the proper
setting of overall mic gain (hardware plus
DSP) if this control is used will also depend
on where the DSP mic gain control is set –
also see (35) MIC.
Please also see FACTORS THAT AFFECT
THE SOUND OF SSB TRANSMIT AUDIO
AND THEIR ADJUSTMENT in Chapter 4.
(FILTR) FILTER MENU
Figure 3-5 Filter Menu
566 manual
Part #74410
Printed in USA
Please refer to the discussion of filtering in
Chapter 1. ORION II provides for up to
seven available mode-appropriate I-F
roofing filters, not to be confused with
traditional bandwidth filtering as provided for
in DSP. Optional roofing filters of 1.8 kHz,
600 Hz, and 300 Hz in the ORION II need to
be activated to be used by the operator.
Please note: If you activate an optional filter
position and no filter is installed, the radio
will mute on receive!
Activating the optional filters is simple. For
each of the 1.8 kHz, 600 Hz, and/or 300 Hz
optional filters that you have installed, use
the MULTI knob to change the setting from
"no" to "yes".
Roofing filters can automatically be selected
by the radio or the operator has the option of
override to select one specific filter to be
used at all times. The available choices are
20 kHz, 6 kHz, 2.4 kHz, 1.8 kHz (if installed),
1 kHz, 600 Hz (if installed), 300 Hz (if
installed).
For automatic selection of appropriate
roofing filters, put the Xtal Filter setting on
AUTO. When using the DSP BW filtering in
the ORION II (see description of (41) PBT
B/W ENCODER in Chapter 2), as a
threshold for each filter is crossed, the
roofing filters will automatically be selected.
Example: After selecting AUTO, press
MENUS to exit out of the menu system and
return to normal radio operation. As the
DSP bandwidth is narrowed, the filters will
be selected or de-selected at the value of
the roofing filter. For example: the threshold
where the 6 kHz filter switches out to the 2.4
kHz filter in AUTO mode is 2400 Hz. On the
screen, the roofing filter is represented by a
horizontal line on top of the DSP BW filter
shape. The line will widen or narrow as the
roofing filters switch in and out.
It is possible to override the AUTO setting
and use one specific filter at all times. To do
so, turn the MULTI knob while Xtal Filter is
is highlighted in the menu and pick a roofing
filter. Regardless of DSP BW setting, this
selected filter will be in use as the roofing
filter. Remember: optional roofing filters,
must be installed and enabled. Selecting a
non-installed filter will mute the receiver. If
selecting an installed optional filter that is
Version 4 – October 2006
35
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