Genesys GDR- COM Series, Installation Manual, Page: 32 / 62

GDR-XXXX NAV/COM INSTALLATION MANUAL
CHAPTER 2 – SYSTEM INSTALLATION
64-000109 Page 32 of 62
Table 8: List of Extended Range VHF COM Antennas
Vendor Part Number Maximum Airspeed Freq. Range
Dayton Granger VF10-347 600 knots "Blade" 116-150 MHz
Harris DM C60-17 Not specified "Blade" 118 -152 MHz
Comant CI-108-1 Not specified "Blade" 118-153 MHz
Harris DMC50 Mach 0.89 "Blade" 118-156 MHz
Harris DM C50-17 Not specified "Blade" 116-156 MHz
Sensor Systems S65-8280-18 Mach 0.85 "Blade" 116-156 MHz
Table 9: List of Combined VHF & UHF COM Antennas
Vendor Part Number Maximum Airspeed Freq. Range
Sensor Systems S65-8282-512 Mach 0.85 "Blade" 108-512 MHz
Cooper Antenna 21-50-99 Mach 0.95 "Blade" 100-400 MHz
B. NAV Antenna
The GDR requires a 50 Ohm horizontally polarized navigation VOR/LOC/GS
antenna meeting TSOs TSO-C34e, TSO-C36e, and TSO-C40c. Some possible
antennas are listed in Table 10.
•
An external diplexer for VOR/LOC and GS signals is not required for a
combined NAV and GS antenna. The GDR contains an internal diplexer to
split the GS signal from the VOR/LOC signal.
•
Use RG-400 or equivalent, not to exceed 2 dB of signal loss.
•
The antenna must be mounted symmetrically with the centerline of the
airframe and should have a clear line of sight in front of the aircraft.
•
In multiple GDR installations, a splitter may be used for the VOR/LOC and
GS signals to route signals to both GDR inputs. A Sensor Systems P/N
SSPD-113-10, or equivalent is recommended for this splitter.
•
When using a splitter, the coax from the antenna will be routed to the
“REC” port of the splitter and the coax from each GDR will be routed to one
of the “ANT” ports of the splitter.
•
Avoid sharp bends of the coax.
•
Maintain at least a 2 foot distance between NAV and COM coaxial cables
when routed parallel to each other.
Table 10: List of NAV Antennas
Vendor Part Number Maximum Airspeed Freq. Range
Dayton Granger VT10-56-6/15960 108-118 & 329-335 MHz
Harris DMN4-17N Mach 1 "blade" 108-118 & 329-335 MHz
Comant CI 205-3 300 knots "towel bar" 108-118 & 329-335 MHz
Comant CI 120-400 300 knots "blade" 108-118 & 329-335 MHz
Comant CI 120 G/S 600 knots "blade" 108-118 & 329-335 MHz