566 manual
Version 4 – October 2006
Part #74410
Printed in USA
44
Figure 4-8. Diversity reception with both
receivers on VFO A. Main receiver and
transmitter are utilizing ANT 1. Subreceiver
is utilizing ANT 2.
In the AUDIO menu, either combine the
audio outputs of the two receivers in both
headphones by selecting “Both” for Sub and
Main RX audio, or put one receiver in each
ear by selecting Main: Left and Sub: Right
The ORION II is now set up for diversity
reception with the main receiver and
transmitter on ANT 1 and the subreceiver on
ANT 2.
For low band DXing, it may be desirable to
combine the outputs of the two receivers
from two different receive antennas while
having the transmitter use a third antenna.
This is accomplished by connecting receive-
only antennas to both ANT 2 and the RX
ANT jacks on the rear panel, and using ANT
1 for transmitting. If desired, the ANT 2
connector can be inhibited from allowing a
transmit signal by enabling Keying Loop 2 in
the menus. See
(69) TX OUT 2 / TX EN 2
elsewhere in the manual.
Put the subreceiver on ANT 2, the main
receiver on RX ANT and the transmitter on
ANT 1 by pushing buttons on the front panel
so they light up as shown in Figure 4-9.
Again put both receivers and the transmitter
on VFO A.
Figure 4-9. Diversity reception. Main
receiver on VFO A is using RX ANT jack.
Transmitter on VFO A is using ANT 1.
Sub receiver uses a second receive antenna
connected to ANT 2.
Using this configuration, both receivers can
use independent receive antennas while the
transmitter uses a separate TX antenna, all
on the same frequency. Both receivers are
tuned simultaneously by turning the VFO A
main tuning knob.
WEAK SIGNAL DX RECEPTION,
CONTEST OPERATION AND ORION II
With most transceivers, an operator typically
would set CW for a low or comfortable
offset, select a narrow bandwidth filter (like
250 Hz), turn AGC to either “fast” or “off”,
use some setting for DSP noise reduction
and start listening for weak signals. Which
is fine –
except that “typical” settings like
this used for other radios simply won’t
use ORION II to its maximum capabilities.
An important point to ponder: There is
no
one setting for RX combination (defined
as roofing filter, DSP bandwidth filter,
DSP NR, and AGC together) that is the
correct one for ORION II
. There are good
places to start – and by understanding how
the operation of the high dynamic range
receiver in ORION II is different from other
transceivers will set you on the correct path
toward optimum use.
Let’s think this through logically. Band
conditions always vary, noise always varies,
signals always vary. If you set a transceiver
for one optimal setting to use it for variable
conditions, would it seem logical that the
operator would be using the transceiver to
its optimum capability each and every time?
Refer back to the definition of the use of a
crystal roofing filter. The roofing filter is
used for keeping strong closeby signals from
Содержание ORION II
Страница 58: ...566 manual Version 3 March 2006 Part 74410 Printed in USA 58 Figure 5 2 Subassembly Cabling...
Страница 59: ...566 manual Version 3 March 2006 Part 74410 Printed in USA 59 Figure 5 3 Plan View of ORION Chassis...
Страница 60: ...566 manual Version 3 March 2006 Part 74410 Printed in USA 60 Figure 5 4 Main Receiver Signal Path...
Страница 61: ...566 manual Version 3 March 2006 Part 74410 Printed in USA 61 Figure 5 5 Subreceiver Signal Path...
Страница 62: ...566 manual Version 3 March 2006 Part 74410 Printed in USA 62 Figure 5 6 Transmit Signal Path...
