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131.200MHz
e) Repeat for each comm transmitter.
f)
If the SL50/60 is susceptible to VHF comm transmitter interference, then better
isolation, or distance, may be required between the GPS and VHF antennas. With
some comm transmitters, a notch filter may be required in series with the VHF
comm antenna coax at the rear of the comm unit.
Note: Older VHF comm transmitters may emit higher levels of harmonic interference
causing greater problems and may be more difficult to deal with.
Interface Checks
The interfaces to other equipment, such as the SL40 or a moving map display, should be
checked. Refer to the SL50/60 user's manual for this part of the checkout. Make sure the other
equipment is connected and switched on.
To check the serial data output connections, verify the data from the SL50/60 can be displayed
on the other units, such as a moving map display or the SL40.
VHF C
C
OMM
HECKOUT
Receiver / Transmitter Operation
Tune the unit to a local frequency and verify the receiver output produces a clear and
understandable audio output. Verify the transmitter functions properly by contacting another
station and getting a report of reliable communications. Check the remote flip/flop.
Antenna Check
The antenna VSWR can be checked using an inline watt meter in the antenna coax using
frequencies near both ends of the band. The VSWR should be < 2:1, and is not to exceed 3:1.
A VSWR of 2:1 will cause a drop in output power of approximately 12%, and 3:1 causes
approximately a 26% drop.
Sidetone Level Adjustment
The sidetone volume was preset at the factory to a typical audio level. The level can be
adjusted using one of the built-in system functions. To adjust the sidetone level:
1. Press
, rotate the
SYS
2. Rotate the
LARGE
3. Rotate the
SMALL
range of 000 to 255, with 255 the highest level. The sidetone level can be adjusted during
transmit.
Comm Flight Test Check
A flight test is recommended as a final installation verification. The performance may be
verified by contacting a ground station at a range of at least 50nm while maintaining an
appropriate altitude and over all normal flight attitudes. Performance should be checked using
low, high, and mid band frequencies.
F
S
INAL
YSTEM
The SL50/60 GPS navigation functions should be complete at this time. The final check
includes checking database, entering a direct to waypoint, and checking the navigation
Apollo SL50 / SL60 Installation Manual
131.350MHz
(SL60)
knob to the "COM R
LARGE
knob to the "S
IDETONE
knob to adjust the sidetone level. The sidetone level is displayed in a
C
HECK
I
:" page, and press
ADIO
NFO
L
:" page.
EVEL
Installation
.
ENT
25
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