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loop to assure proper sequencing of the
keying between the radio and the amplifier.
To use the ORION with a full break-in linear
amplifier incorporating a keying loop, use
the TX OUT 1 / TX EN 1 or TX OUT 2 / TX
EN 2 jacks as appropriate for an amp
connected to the ANT 1 or ANT 2 jacks.
Connect TX OUT 1 to the keying loop input
on your amp. On Ten-Tec amplifiers, the
corresponding jack is marked KEY IN.
Connect TX EN 1 to the keying loop output
on your amp. On Ten-Tec amplifiers, the
corresponding jack is marked KEY OUT.
Place the amp in QSK mode. The amplifier
will be used in all modes in the QSK
position.
Please note: To use a full break-in keying
loop, it must be enabled from the MENUS.
The keying loops are turned on and off via
the TX submenu in the MENUS (see the TX
MENU description in Chapter 3). If the loop
is turned on, and no connections are made it
will prevent the ORION from transmitting.
TUNING UP AN EXTERNAL LINEAR
AMPLIFIER
The TUNE button on the front panel can be
used for initial linear amplifier tune-up. If an
automatic antenna tuner is installed in your
ORION, go into the TX MENU and disable it.
Pressing the TUNE button will provide
approximately 20 watts of keydown CW
carrier output to be used for an initial tune-
up of your linear.
It may be desirable to increase the keydown
power output when tuning your amplifier. To
do so, press the PWR button after pushing
the TUNE button. Power output will move
from the low power setting to whatever level
the PWR control has been set at with the
MULTI knob. Repeat operation will require
pushing TUNE then PWR again for the
higher output value.
FACTORS THAT AFFECT THE SOUND
OF SSB TRANSMIT AUDIO AND THEIR
ADJUSTMENT
One of the features of ORION is a lot of
flexibility afforded the operator for the
desired sound of SSB transmit audio. Many
possible settings are available so that
operators with different styles (or
philosophies) can adjust the radio the way
they want it to sound. Obviously, the
565 manual
Part #74279
Printed in USA
operator who favors rich, full-sounding
transmit audio is not going to have the same
needs as the DXer who wants maximum
"oomph" to try and break an SSB pileup.
There are several controls that interact on
ORION for SSB transmit audio. Every
operator is different; we use different
microphones, the timbre of voices are
different, distance from the microphone will
vary. What we intend below is to describe
what is used to tailor transmit SSB audio,
and then encourage the operator to
experiment with the settings to find the
sound they want.
A monitor function (button marked MON) on
the front panel has been provided for the
operator to listen to the sound of actual
transmitted SSB audio. We recommend
using headphones while using the MON
circuit to prevent microphone/speaker
feedback. See the description of (18) MON
in Chapter 2.
There are five radio controls used for SSB
transmit audio. 1) Transmit bandwidth,
which is adjusted using the TX Filter BW
control in the SSB menu. 2) Low frequency
rolloff, adjusted with the L.F. Rolloff control
in the SSB menu. 3) Transmit equalization,
labeled TX EQ, which is adjusted in the
AUDIO submenu found by pushing the
AUDIO button on the front panel. 4) Mic
gain, adjusted via the front panel MIC
button. 5) Speech processing, adjusted via
the front panel SP button.
Transmit bandwidth is both the frequency
response of the transmitted signal and the
amount of spectrum occupied by that signal.
Typical communications-grade audio for
SSB is in the 2.4 to 2.7 kHz range. Some
"hi-fi" SSB enthusiasts have been
experimenting with larger transmit
bandwidths in an effort to improve the
quality of audio transmitted, and ORION has
been provided with the ability to transmit on
SSB with a maximum bandwidth of 3.9 kHz.
Please see the note toward the end of this
section about wide SSB transmit bandwidths
and their potential ramifications.
Set the TX Filter BW in the SSB menu to an
appropriate value based on your operating
preferences. For communications- grade
audio, we recommend starting the ORION
transmit bandwidth at 2.55 kHz (2550 Hz).
September 2003
39
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