Sigtronics Sport 200 Installation and Operating Instructions
The Sigtronics Sport 200 is a voice actuated intercom with “transmit through
the aircraft radio capability” using your push-to-talk switch. Three controls are
provided:
Power Switch
— Turns unit on and off.
Volume Control
— Controls the intercom volume.
Squelch Contro
l — Allows the setting of voice actuated (VOX) operation of the
intercom for variations in background noise levels and differences in headset
microphones.
OPERATING INSTRUCTIONS
I. INTERCOM MODE
A. Put on headset/s and position the boom mic close to the mouth, as is the
practice with a hand-held mic. Voice clarity is best when mic is at one side
of the mouth and 1/4” from the lips.
B. Set audio panel to “Headphone” position, if applicable.
C. Turn power “on” and set Volume Control to a low level. (1/4th to 1/3rd open
for best signal to noise ratio).
D. To adjust the intercom SQuelch for voice activated operation (VOX), it is helpful
to have some background noise present. Turn intercom SQuelch control all
the way counter-clockwise. Now, without speaking, rotate the SQuelch control
clockwise until you hear the background noise in your headset. Next, rotate
it counter-clockwise a small amount and wait (approximately 1 second) until
the background noise disappears. Finally, make small adjustments until
your voice triggers the unit at comfortable speaking levels. This procedure is
necessary because the squelch is a “Fast-on, Slow-off” system.
For applications where voice activated (VOX) intercom operation is not
desired, see
PUSH-TO-INTERCOM INSTRUCTIONS.
Once set, the intercom stays silent until someone speaks in their headset
microphone (mic). Then it instantly turns on and relays the conversation. After
about a second of no conversation, the intercom goes silent again.
Minor readjustment of the SQuelch may be necessary if the background noise
level changes significantly (such as from taxi to take-off power conditions).
II. RADIO TRANSMIT MODE
— Transmitting from both pilot and co-pilot positions
is possible on a one-at-a-time basis. The transmitting mic disables the other mic.
When you are ready to talk to ATC, depress the transmit switch on your yoke and
your voice is automatically transmitted via the aircraft radio. (You will hear your
own voice when transmitting via the aircraft radio side-tone return, If the radio
does not have side-tone, then you will not hear your voice). (See SIDETONE
MODIFICATION sheet to modify the intercom to simulate side-tone).
III. RADIO MONITORING
— Radio monitoring is automatic. The radio monitor
circuit is always active; even with intercom power switch “off”.
IV. SOLO FLIGHTS
— Since the intercom is not needed during solo flights, it may
be turned off. The pilot will still hear the aircraft radio, since this circuit is always
active, and the pilot may transmit to ATC via his push-to-talk switch. (Co-pilot
position cannot transmit when intercom is off).
V. BACK-UP
— If a problem is suspected in the intercom, simply turn it off. You will
still receive the aircraft radio and will be able to transmit from the pilot’s position.
The hand mic may also be used, however, the intercom should be turned off
and you should unplug your boom mic from the mic jack. (Leave headphone
plugged in for radio reception).
CHASSIS INSTALLATION
The Sigtronics Sport 200 has been designed to mount either horizontally or
vertically in your aircraft panel. All necessary mounting hardware has been supplied
for a 2-way installation. (A round faceplate is also available from Sigtronics to fit a
2 1/4” round instrument hole).
HARDWARE SUPPLIED
• Headphone Output Jacks — Accept standard .250” aircraft headphone
plugs ............................................................................................................2
• Microphone Input Jacks — Accept standard .206” aircraft microphone
plugs (i.e. amplified dynamic or electret). (U93 plug compatible jacks
can be used in place of the jacks provided).................................................2
• Mic Jack Insulating Washers: ........................................(2) shoulder, (2) flat
• Panel: Lettered on both sides ......................................................................1
• Control Knobs ..............................................................................................2
• Switch Nut ....................................................................................................1
• 4-40 Screws .................................................................................................2
• Template: Hole size pattern for drilling aircraft panel ...................................1
• Aircraft / Intercom interface cable (4 feet long) ............................................1
The location selected requires a minimum front panel area of 2-1/2” by
1-1/16”. Depth required behind panel is 4-3/16” plus cable access.
Caution: Move aircraft flight controls through limits of travel while observing
selected area to make sure rear of intercom and cable will not interfere with
aircraft control components.
PANEL PREPARATION:
1. Position adhesive template on aircraft panel in selected area.
2. Center punch each hole at cross lines. (The five holes are in straight line and
equally spaced 0.4” apart.)
3. Drill 1/8” pilot hole all five places.
4. Enlarge holes to 1/4” and 3/8” per template.
MOUNTING CHASSIS: See Figure 2.
1. Remove nut from Sport 200 ON-OFF switch bushing.
2. Remove knobs from Volume and Squelch controls.
NOTE: DO NOT REMOVE
NUTS
from Volume and Squelch control potentiometers.
3. Remove two 4-40 panel screws and remove panel from Sport 200 chassis.
4. Insert Sport 200 from rear of aircraft panel with appropriate arrow pointing
upwards.
5. Install panel and lightly thread nut on to ON-OFF switch. Nuts and washers on
Volume and Squelch controls should fit inside the 3/8” diameter holes.
6. Select two 4-40 screws through holes in intercom panel. Tighten ON-OFF switch
nut.
7. Install knobs on Volume (VOL) and Squelch (SQ) control shafts using .050” Allen
wrench.
continued
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Figure 2
Figure 3
Microphone Jack
Figure 1
