Diversity Reception - Ten-Tec Orion 565 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, 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 - this output is ALC
controlled and is adjustable from +5 to +15
dBm by using the PWR and MULTI control
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 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. 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.

DIVERSITY RECEPTION

Because the ORION 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.
565 manual
Part #74279
Printed in USA
565 TRANSCEIVER
RX ANT
(Split
antenna
mode)
XVRT RF
XVRT KEY
September 2003
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 are more copyable
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 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.
Figure 4-8. Diversity reception with both
receivers on VFO A. Main receiver and
transmitter are utilizing ANT 1. Subreceiver
on VFO B 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
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