How Much Output Power Can Be Used - GE MDS iNET 900 Reference Manual

05-2806A01, Rev. J
order to maintain compliance with FCC maximum limit of +36 dBi. If
other coaxial cable is used, the appropriate changes in loss figures must
be made.
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.
Table 4-2. Feedline Length vs. Antenna Gain*
(Required for Regulatory compliance)
Antenna Antenna
Gain (dBd) Gain (dBi)
Unity (0 dB) 2.15 dBi
3 dBd 5.15 dBi
5 dBd 7.15 dBi
6 dBd 8.15 dBi
9.2 dBd 11.34 dBi
*Refer to Table 4-3 for allowable power settings of the transceiver for
each antenna type.
NOTE: There is no minimum feedline length required when a 6 dBi
gain or less antenna is used, as the EIRP will never exceed 36
dBm which is the maximum allowed, per FCC rules. The
transceiver's RF output power may only be adjusted by the
manufacturer or its sub-contracted Professional Installer.
The MDS iNET-II Transceiver is factory set to +29 dBm
power output to maintain compliance with the FCC's Digital
Transmission System (DTS) Part 15 rules. These rules limit
power to a maximum of 8 dBm/3 kHz, thus the iNET-II Trans-
ceiver is factory set to +29 dBm. When calculating maximum
transceiver power output for iNET-II installations, use +29
dBm if antenna gain is 6 dBi or less. See How Much Output
Power Can be Used? on Page 135 for power control of higher
gain antennas.

4.1.6 How Much Output Power Can be Used?

The transceiver is normally supplied from the factory set for a nominal
+30 dBm (+29 dBm for iNET-II) RF power output setting; this is the
maximum transmitter output power allowed under FCC rules. The
power must be decreased from this level if the antenna system gain
exceeds 6 dBi. The allowable level is dependent on the antenna gain,
feedline loss, and the transmitter output power setting.
iNET Series Reference Manual
Minimum Feedline EIRP Level @
Length (Loss in dB) Min. Length
No minimum length +32.15 dBm
No minimum length +35.15 dBm
3.1 meters (1.2 dB) +35.95 dBm
9.1 meters (2.2 dB) +35.95 dBm
25 meters (5.34 dB) +36.00 dBm
Maxrad Antenna
Part No.
Omni #MFB900
Omni # MFB900
Omni # MFB900
Yagi # BMOY8903
Yagi OGB9-915
133