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the rate, but not the step size, of the RIT
encoder. The "fast" rate is 4x the "slow"
tuning rate.
If the optional model 302R encoder/keypad
is in use, POD Enc Rate can be used to
control the tuning knob rate. The "fast" rate
is 4x the "slow" tuning rate
LCD Display is used to toggle the radio
screen between a white background with
black alphanumeric information and a black
background with white alphanumeric
information. Turn the MULTI knob to toggle.
FSK Tx Data is used to to determine
whether the MARK tone in FSK operation is
on the high tone (2295 Hz) or low tone
(2125 Hz). The standard is for FSK to use
the low tone for MARK. See the description
for FSK OPERATION in Chapter 4.
(SSB) SSB MENU
Figure 3-7 SSB Menu
The SSB menu is used for adjustment of
SSB transmit options.
Aux Input Gain is used for adjusting audio
gain from an accessory device using the line
level aux input available on pin 1 of the rear
panel AUX I/O connector.
TX Filter BW controls the SSB transmit filter
bandwidth. The maximum bandwidth usable
by ORION is 3.9 kHz. Wider bandwidths
(above 3 kHz) have a more full-range sound
to transmitted SSB audio; narrower
bandwidths are "communications grade"
SSB audio. Typical communications audio
for TX Filter BW would be 2.7 kHz.
L.F. Rolloff refers to the point where low
end audio response starts for transmitted
SSB audio. For example, if TX Filter BW is
565 manual
Part #74279
Printed in USA
set to 3000 Hz and L.F. Rolloff is set to 200
Hz, the frequency response of the
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.
Please also see the description for setting
up SSB transmit audio in Chapter 4.
(FILTR) FILTER MENU
Figure 3-8 Filter Menu
Please refer to the discussion of filtering in
Chapter 1. ORION 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, 500 Hz,
and 250 Hz in the ORION 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, 500 Hz, and/or 250 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
September 2003
35
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