Diversity Reception - Ten-Tec ORION II Manual

VHF/UHF
TRANSVERTER
V/UHF RX
COAX
V/UHF TX
XVRTR KEY
SHIELDED WIRE
Figure 4-7 Connecting a Transverter
Basic connection for a transverter is shown
in Figure 4-7. The receive side of the
transverter is connected to the AUX RX jack.
On ORION II, select VFO A for transceive
operation by pressing the TX and RX
buttons on the front panel in the VFO A
column under the S-meter. Select RX ANT
for MAIN RX/TX on the front panel.
The transmit side of the transverter is
connected to the XVRT RF jack. XVTR RF
provides a low level output RF output of
approximately +15 dBm (35 mW) - this
output is ALC controlled and is adjustable
from +5 to +15 dBm (3.5 to 35 mW) by using
the PWR and MULTI controls when the
transverter output has been activated in the
menus.
XVRT KEY is for the PTT connection of your
transverter.
It may be desirable to employ the use of a
sequencer for proper key sequencing of
transverter, radio, linear amplifier, etc.
ORION II can easily be used with a
sequencer. The last relay output to close on
the sequencer should be connected to the
TX EN 1 jack on the rear of the ORION II.
Go into the menus and turn on Keying
Loop 1. This keying loop will prevent the
radio from transmitting until a closure to
ground appears at the TX EN 1 jack. By
connecting the last relay to close on the
sequencer to the TX EN 1 jack, the operator
will have ensured that all required keying
connections have been closed prior to RF
appearing at the output of the XVRT RF
jack.
566 manual
Part #74410
Printed in USA
565 TRANSCEIVER
RX ANT
(Split
antenna
mode)
XVRT RF
XVRT KEY
Version 4 – October 2006

DIVERSITY RECEPTION

Because the ORION II has the ability to
have both receivers tuned by a single VFO
simultaneously, and because both receivers
can be split out to different antennas, a
world of possibilities for diversity reception
are opened.
First, a definition of "diversity reception":
Radio reception in which a signal is obtained
by combining or selecting signals, from two
or more independent sources, but which
may vary in their fading characteristics at
any given instant. Good examples would be
the use of one horizontal and one vertical
antenna or two horizontal antennas
separated by one wavelength or more.
It has been shown from studies that weak
and/or fading signals can be copied better
when they are heard from two sources
simultaneously rather than only one. As
signals fade, if another source is available to
simultaneously monitor the signal, the fading
effect can be somewhat compensated for.
This is useful not only for the weakest
signals when chasing DX, but for normal
communication where signal levels are fairly
readable but still subject to some QSB.
Because ORION II allows you to tune two
receivers with one VFO, diversity reception
is possible using the two receivers on two
separate antennas.
First, put both receivers on the desired
amateur frequency on VFO A. To do this,
merely press all three of the buttons in the
VFO A column directly under the S-meter.
Now both receivers and the transmitter are
tuned by the VFO A tuning knob. Press
ANT 1 for MAIN RX/TX and ANT 2 for SUB
RX. See Figure 4-8.
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