Yaesu FT-990 Operating Manual page 5

Accessories
&
Optio11s
SP-6 Loudspeaker w ith Audio Filters
and LL-5 Phone Patch Option
Selectable audio
high-
and
low pass
filters
with
a
large lOudspe'*er oomplement the
superb
audio
characteristics of
the IT-990 w ith
your choice of 12
different
a.udio
filtering combinations. Two input
terminals
are provided for multiple transceivers,
with a front panel
switch
to
select
between
them. A
phone
jack is
provided on
the front
panel to
ta)<e
advantage of
the
audio filters
wit· b
headphones.
With the optional LlrS
Phone
Patch
Unit instal-
led
·in
the SP-6, the FT-990
can
be. patched to the
public telephone network. The
LL-5 includes a hy-
brid
ttansformer circuit
to
assure proper
imped-
ance matches, andga
in
controls
and
level
meter to
set
proper au.dio levels on
the
' t elephone line.
YH-77ST Lightweight Headpl1011es
Dual samarium-cobalt transducers
with
sensi-
tivity of 103dB/mW ( 2dB, @1 kliz, 35!1) provide.
the
perfect
matCh
for
the
FT-990,
taking full advan-
tage of the spectacular audio performance.
page4
DVS-2 Digital Voi(:e System
Serving as either a
continuous receiver recorder
ior instant pushbutto·n playback, or 1nicropbone
audio recori:.fer for multiple on air playback, the
DVS-2 appli.es
the
advantages of random-access
solid-state digital memory
fo serious
oornmunica-
tions. All data
is
Stored electronically,
with
no mov-
ing parts except your finger and tne pushbutton.
More infonnation is on page 36.
FIF-232C CAT System Interface
To control the FI' -990
from an RS-232C serial
pc:Jrt of an
external pet$()nal computer,
use
thErFIF·
232C to
con vert the
TT" levels r¢quiied
.Qy
the
transceiver
to
the
RS-232C levels required
by
the
serial port. A cable is included for connection be·
tween the
transceiv:er
and the
Fli"-232C
(the cable
\0
t,heeqtnpu ter must
be provided
separately), The
Fl~·232C
includes its own ACpower supply.
IF Crystal Filter Optio11s
For extra CW receiver
selectivity,
the XF-455I<-
251-01 8-pole 250-Hz crystal
filter . m ay
be installed
in
the
455-kHz
3rd
1Fof ihe FT-990,
to cascade with
U1e
500-Hz 2nd lF filter ((actory,lnstalled in theAC
ver.sion, or optional in the DC version).
Als<J, for $SB
reception under
difficult
condi-
iions,
the XF-10.9M-202-0,
&-pole
2-kHz crystal fil.
~r
may be inst(llled in the 10.9-kHz
2nd IF, and
switched in
from
the
front panel
when
needed.