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use the TX EN and TX OUT jacks. TX EN
on the transceiver is connected to KEY OUT
on the amplifier, TX OUT on the transceiver
is connected to KEY IN on the amplifier.
Place the amp in QSK mode. The amplifier
will be used in all modes in the QSK
position. The keying loop voltage and
current limits are 15 Vdc and 100 mA.
The keying loop in the OMNI-VII must be
enabled through the menu. For menu line
item KEYING LOOP, select ON. Please
note that if KEYING LOOP is turned ON and
no ability to complete the loop is present (i.e.
no connection, or a connection that is not
closing properly) the radio will not transmit.
OMNI-VII is equipped with a T/R delay
feature (EXT T/R DELY) accessible via the
menu that operates on both the AMP KEY
connection and the TX EN / TX OUT keying
loop. This gives the operator the ability to
have the amplifier keyed longer by the radio,
preventing drop outs between words of SSB
or CW operation.
Linear amplifiers can be used on either of
the ANT 1 or ANT 2 antenna jacks on the
rear panel.
IMPORTANT NOTE: The AMP KEY line
should not have applied to them more than
+100V (output inactive) nor should it draw
more than 250 mA (output active). Many
older linear amplifiers like those
manufactured by Collins, Drake, and
Heathkit have a higher voltage on the
keyline. Such amplifiers require a relay or
transistor switch between the OMNI-VII AMP
KEY jack and the amplifier PTT input. A
sample plug-and-play device that can be
used between OMNI-VII and your amplifier
is the Ameritron ARB-704 interface box. If
you are unsure if your amplifier is suitable
for use as-is with the OMNI-VII, please
consult the operator's manual for your
amplifier or contact the Ten-Tec service
department at (865) 428-0364 or
service@tentec.com
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
OMNI-VII, go into the menu and disable it
with the AUTO TUNER line item. Pressing
588 manual
Part #74409
Printed in USA
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.
INSTALLATION OF OPTIONAL
COLLINS™ MECHANICAL
FILTERS
Collins™ mechanical I-F filters for the 455
kHz I-F at 500 and 300 Hz bandwidth are
available as optional equipment.
To install optional filters: Turn transceiver
power off and remove DC power cable.
Remove the four side case screws.
Remove the 5 Torx screws from the rear
perimeter of the top cover. A Torx wrench to
remove them is supplied in the transceiver
packing kit.
Place the radio on the table with the front
facing you.
Slide the top cover of the radio just back
enough to get the metal lip out from under
the plastic face of the transceiver. Remove
the top cover by lifting SLOWLY to your right
– the cable running to the transceiver
internal speaker is attached to the underside
of the top cover. Pulling hard on the cover
or pulling to the left can break the speaker
wire. Set the top cover against the right side
of the open radio.
The filter slots are on the RF board – this
board is the center and left front of the rig.
The filter slots are 6 inches back from the
front of the radio near the left side and are
covered with a small metal shield attached
to two posts with screws. Using a Phillips
screwdriver, remove the screws and the
shield. The open slots on the board are
marked '500 Hz' and '300 Hz'. The filters
have three pins oriented in a slight V
pattern. Insert the filter pins into the sockets
on the board. Replace the metal filter
shield. Replace top cover and top cover
screws.
Second release – August 2007
28
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