ADTRAN 2 x E1 user manual Setting the Transmitter Power, GHZ, 1 Watt Transmitter Option

61280004L2-1C

Section 2 Installation

The nominal received signal level is -60 dBm. For help in link planning, use the path loss calculation worksheet below.

-	89 dBm / -87 dBm	Minimum Signal Power for 2.4 GHz / 5.8 GHz
+	_______	Transmitter Feedline Loss
-	_______	Transmitter Antenna Gain
+	_______	Path Loss
-	_______	Receiver Antenna Gain
+	_______	Receiver Feedline Loss
+	_______	Required Fade Margin
=	_______	(dBm) Transmitter Power Setting

SETTING THE TRANSMITTER POWER

The FCC specifies the maximum transmitter power that may be used for antennas of a given gain. FCC rules Part 15, Subpart 247 allow for a maximum power of 1 watt into antennae of a gain less than or equal to 6 dBi. For every 3 dB of gain over 6 dBi, the transmitter must be reduced by 1 dB. The following table lists the maximum transmitter power for given antennae gains. For the 5.8 GHz band, there is no reduction in transmitter output power required for antenna gains greater than 6 dBi.

Antenna Gain	Power
6 dBi	30 dBm (2.4 GHz, 1 watt output option)
12 dBi	28 dBm (2.4 GHz, 1 watt output option)
18 dBi	26 dBm (2.4 GHz, 1 watt output option)
24 dBi	24 dBm (2.4 GHz, 1 watt output option)
30 dBi	22 dBm (2.4 GHz, 1 watt output option)
36 dBi	20 dBm (TRACER, 2.4 GHz, 100 mw output option)

The transmitter power is set by way of a momentary switch on the front panel of the BBP or via the configuration page of the VT100 interface. The RFC must be attached by way of the IF cable during this operation. Attach an RF power meter to the N-type antenna connector on the RFC, and adjust the power by way of the front panel switch or VT100 until the desired transmitter power is obtained. If a mastmount RF converter is used, the transmitter power adjustment should be made before the RFC is installed on the mast.

2.4 GHZ, 1 WATT TRANSMITTER OPTION

The 2.4 GHz TRACER model is offered with a standard +20 dBm power output or optional 1 watt power output option. The 1 watt option provides an add-on amplifier that is installed in the rackmount RFC chassis. This amplifier is connected to the transmit cable of the RFC module and amplifies the +20 dBm output power to a maximum level of +30 dBm (1 watt), factory set to +27 dBm. The output power is proportional to the output level from the RFC module. The level is adjusted via the Baseband Processor front panel or VT100 terminal.

Because the 1 watt amplifier is frequency specific, the frequency plans can not be manually changed by swapping the TX and RX cables in the RFC chassis as described in the following section. If a frequency reversal is required, the rackmount RFCs will have to be relocated to the opposite ends of the microwave path. The 1 watt option is only available for the 2.4 GHz, rackmount RF converter.

TRACER 2 x E1 User’s Manual 17