Front Panel Controls - Yaesu FT-990 Operating Manual

Controls & Connectors
Front Patrel Controls
I ll
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7
II
12
This chapter dt>scribes each control and connec-
tor on the PT-990. You can just read through
quickly
now,
but some of the descriptions will
be
more meaningful if you first work through the
Getting Stt1rted Tutorial
at the beginning of the Ofl·
era lion chapter, and then
return
to
this chapter with
the set powered up,
as
questions arise during op-
eration. Some controls and switches are disabled
under certain conditions.
(1) POWER
This
bullon turl'S the transceiver on and off.
(2)
2-Position Ptlsltbutton Switcltes
IU AN T
When this switch is in the undepressed {a)
position, the antenna connected to the main
ANTsocket is used for receive (it is always used
for
transmit). When this
switch is depressed
(- ), the IU ANT IN l OUT
jacks
on the rear
panel are activated, with either
a
receive-only
antenna, external receiver or in-line receiver
accessory. See the schematic
on page 27
for an
idea of how this works.
HOX
This button may be
used in place of
a
micro-
phone
P'lT
switch or CW key to manually
activa te the transmitter. It must be in U1e on-
depressed (.-) position for reception.
vox
Enables automatic voice-actuated tr<msmilter
switching in voice modes; and semi break-in
keying in CW mode. The controls aiJ'ecting
VOX operation
are in the lop access panel.
An
Press this button when receiving on a noisy
band or when strong signals are present. This
inserts
a
20-dB
attenuator in the front end to
protect the receiver from overload.
(3)
PHONES
This Y,-inch,3-contact jnck accepts either mon-
aural or s tereo headphones with
a
2- or <l-eon-
tact p lug . When
a
plug is inserted, the
loudspeaker is disabled. Audio
Is
supplied to
both channels of
a
stereo headphone.
(4) M ETER
Selector
This selector detemllnes the function of the
mullimeter during transmission.
The
mean-
ings of the abbreviations are as follows:
PO RF Power Output (watts)
IC
Final amplifier collector current (Amps)
SWR Standing Wave Rallo (forward :reflected)
COMP
IU?
~peech
compressor
level (in
dB,
for SSB modes only)
ALC relative Automatic Level Control voltage
vee Final amplifier collector voltage.
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