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adjustments for programmable AGC. This
will allow good copy of the weaker signals
but allow the AGC system to compress loud
signals and give uniform signal output for
both the weak and loud signals. Of course,
there are times when digging out the weak
ones is part of contesting as well, and the
prog AGC settings for weak signal DXing
may be of use, but setting the most optimal
AGC setting for any one signal is not always
the most practical during a contest. Setting
programmable AGC at 0.00 or 0.04 hang,
20 dB/s decay and 1 uV threshold is a
good starting point but individual operators
will want to vary them according to taste and
to account for what band you're operating at
the moment.
Where do I set the DSP NR? Obviously,
with signals coming in and out, if you choose
to use NR it should be at a higher setting
like "3" or "4" to allow very quick adaptation
of each appearing signal. Setting it very
high to start could result in signal distortion
(particularly on SSB), but setting the value
too low may not allow it to act quickly
enough on the weaker signals. There is
another choice, of course, and that is to
simply leave it off – and with the ORION II's
receiver capabilities individual operators
may find this to be the best choice of all.
Remember, like all adaptive DSP noise
reduction, sometimes it helps, sometimes
does nothing, sometimes hinders. It all
depends on signal and noise at that
particular moment. Each operator will use
or not use it to taste.
EXTERNAL CW OUTPUT PLUS CW
KEYER OPERATION FROM PADDLES
Some contest logging programs use
computer generated CW for transmission of
contest data (CQ's, reports, etc.) but do not
employ the ability to send CW through any
device other than input from the computer
keyboard.
It is useful in this situation to be able to have
both an external keyer (in this case, the
computer) and the internal keyer in the
ORION II both simultaneously available.
The "external keyer" is used for contest
CQ's and information, while a paddle
connected to the internal keyer can be used
by the operator for quickly repeating
necessary information.
566 manual
Part #74410
Printed in USA
Pin 3 on the AUX I/O connector on the
ORION II rear panel is a PTT connection.
In CW modes, this can allow the radio to be
keyed by an external device in CW mode.
There is a menu item located in the CW
MENU titled PTT in CW as. When this line
item is set to "key", a CW signal from an
external source can be injected into either
the mic jack or pin 3 on the AUX I/O cable
on the rear of the radio. Connect the output
of the external keyer to pin 3 on the AUX I/O
connector or the PTT connection on the mic
jack. Connect your paddle either to the
front panel or rear panel key connector and
use the SP button to enable the internal
keyer. ORION II will now transmit CW either
through the pin 3 input or using the paddles
and internal keyer.
DRAG ADJUSTMENT FOR MAIN TUNING
KNOBS "A" AND "B"
The two main tuning knobs have individual
drag controls. To adjust the drag on either
tuning knob, hold the silver skirt still while
rotating the knob about a quarter turn.
There will be a gentle "click" feel as each
knob is loosened or tightened. Counter-
clockwise twisting will loosen them and
clockwise twisting will increase the drag.
Loosen them up or increase the drag to your
preference.
INSTALLATION OF OPTIONAL CRYSTAL
ROOFING FILTERS
In addition to the four stock roofing filters of
20, 6, 2.4 and 1 kHz, there are three
optional roofing filters available for the
ORION II. 1.8 kHz (model 2000), 600 Hz
(model 2001) and 300 Hz (model 2002).
Field installation of these filters is relatively
simple.
Remove the top cover of the transceiver.
Facing the transceiver, the filters are located
at the top front left of the transceiver. There
is a metal shield in place over the filters held
by a single screw – remove this using a
Phillips screwdriver. The optional filters are
plug-ins and each filter location is marked.
The filters MUST be installed with the
correct orientation and with the supplied
insulator under each filter.
Two of the pins on the bottom of the filter
are grounded to the filter case; two are not.
Version 4 – October 2006
48
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