User's Manual Part 3

166 Mercury Reference Manual 05-4446A01, Rev. D
The tables below outline the minimum lengths of RG-214 coaxial cable
that must be used with common GE MDS omnidirectional antennas in
order to maintain compliance with FCC maximum limit of +36 dBi. If
other coaxial cable is used, make the appropriate changes in loss figures.
NOTE: The authority to operate the transceiver in the USA may be
void if antennas other than those approved by the FCC are
used. Contact your factory representative for additional
antenna information.
*Refer to Table 5-4 on Page 170 for allowable transceiver power set-
tings for each antenna type.
1/2 inch HELIAX 0.92 dB 4.6 dB 9.16 dB
Unacceptable Loss
7/8 inch HELIAX 0.52 dB 2.56 dB 5.12 dB
Unacceptable Loss
1-1/4 inch HELIAX 0.40 dB 1.92 dB 3.8 dB 19 dB
1-5/8 inch HELIAX 0.32 dB 1.6 dB 3.2 dB 16 dB
Table 5-2. Length vs. Loss in Coaxial Cables at 3600 MHz
Cable Type
10 Feet
(3.05 m)
50 Feet
(15.24 m)
100 Feet
(30.48 m)
500 Feet
(152.4 m)
Table 5-3. Feedline Length vs. Antenna Gain*
(Required for Regulatory Compliance)
Antenna
Gain (dBd)
Antenna
Gain (dBi)
Minimum Feedline
Loss (dB) that must
be introduced for
compliance
EIRP Level @
Min. Feedline
Length
Maxrad Antenna
Part No. (For 900
MHz Operation)
Unity (0 dB) 2.15 dBi No minimum length +32.15 dBm Omni #MFB900
3 dBd 5.15 dBi No minimum length +35.15 dBm Omni # MFB900
5 dBd 7.15 dBi 1.2 dB +35.95 dBm Omni # MFB900
6 dBd 8.15 dBi 2.2 dB +35.95 dBm Yagi # BMOY8903
9 dBd 11.15 dBi 7.15 dB +35.25 dBm Yagi # Z941
15.2 dBd 17.4 dBi 12 dB +35.4 dBm Andrew
DB878G90A-XY