— 5 —
Headphone Jack
The front-panel
PHONES
jack will accommodate stereo
headphones of virtually any impedance with a 3.5mm stereo
plug. When headphones are plugged in, the LCD menu will
automatically go to the
HEADPHONE VOL
screen, and the
front-panel knob will adjust the listening level. When you
have set the volume to a comfortable level, push the knob
to return to the previous menu.
Rear Panel Connections
ANTENNA
The rear-panel ‘F’ connector is a high
impedance antenna input. A short
whip or random wire should prove ac-
ceptable in a high-signal situation, such
as co-located with a transmitter. Oth-
erwise we recommend the optional
companion outdoor active loop antenna
available from Inovonics.
G +5 A C
These are alarm “tally” outputs for re-
mote indication of reception problems.
Designations are also noted on the rear
panel and stand for Ground, +5 DC
volts, Audio Loss and Carrier Loss.
The two alarm outputs are the collec-
tors of NPN transistors that saturate to
ground for an alarm condition. Up to
100mA may be ‘sunk’ by each of these
outputs to operate relays or LED indica-
tors using an external voltage source up
to 24VDC, which must be returned to
the
G
(Ground) terminal. The +5VDC
supplied on the
+5
terminal is current-
limited with a 100-ohm series resistor
and suitable only for optical couplers,
LED indicators or small reed relays.
The plastic connector body may be un-
plugged from the chassis to make con-
nection easier and for quick disconnect.
— 6 —
AES DIGITAL
AUDIO OUTPUT
The balanced, transformer-isolated AES
digital audio output has a fixed sam-
pling rate of 44.1kHz. 100% carrier
modulation equates to –3dBFS.
ANALOG LINE
OUTPUTS L/R
The active-balanced analog line outputs
are marked
LEFT
and
RIGHT
, but are in
fact dual
monaural
outputs. They pro-
vide a program level of +4dBu at 100%
carrier modulation and have a 200-ohm
source impedance.
+12VDC
POWER I/O
These two parallel connecters allow
‘daisy-chaining’ INOmini modules. This
allows one DC supply to power up to
three modules mounted in a single rack
adapter, provided that the rating of the
supply is not exceeded. Two short ‘pig-
tail’ cables are provided with each rack
adapter.
The Model 634 receiver draws 140mA.
Check the rating on the label of the
power supply to make sure it has
enough oomph for the modules it must
support.
These power connectors are not a lock-
ing type, and the mating plugs do pull
out rather easily. A Ty-Wrap® will se-
cure the cables to the plastic anchor
above the jacks if this is foreseen as a
problem.
