Table of Contents
Advertisement
H E A D S
U P
T E C H N O L
RG Type
(Mil-C-17)
142
400
316
178
When multiple receiver LRUs are installed, the cable loss between the receivers does not
need to be considered when they are in close proximity. In cases where the LRUs are
mounted several feet apart, more detailed cable loss analysis is required to insure all
receiver LRUs receive the correct antenna gain.
3.4.2
Interference from VHF and SATCOM Transmitters
Mount the antenna no closer than 36 inches to VHF-Comm transmitters of 15
•
Watts or less. For more powerful transmitting antennas, XM separation should be
a minimum of 48-inches. Installation pre-testing (see note below) should be
performed if the separation is less than 60-inches.
If an XM/VHF-Comm combo style antenna is being installed and replacing the
operation of an existing approved antenna installation, the existing separations
are acceptable.
SATCOM antennas transmit at 40 Watts and should be separated by the largest
•
distance possible, or a minimum of 36-inches.
When routing the XM antenna cable, the maximum possible separation from
•
transmitter antenna feed cables must be considered, especially with SATCOM
and other high power transmitters. Antenna feed cables of VHF transmitters of 15
Watts or less should only require a minimal separation.
Receive only antennas such as ADF and GPS do not produce interference and
•
require little separation. The XM antenna should be placed as close as possible
to these types of antennas to gain separation from transmitters.
XMR-3
Rev. C, 04/05/06
O G I E S
Table 1 - Cable Length Chart
Loss Rating
Length Range (Ft.)
(dB/100-Ft.)
@ 8 - 12dB Loss
@ 2.339GHz
20.6
38.8 – 58.3
23.41
34.2 – 51.3
40.87
19.6 – 29.4
68.82
11.62 – 17.4
NOTE:
XM Radio
Installation Manual
Page 16 of 31
Advertisement
Table of Contents
