User Manual

MM102225V1, Rev. B

6.3 TOWER TOP LOW NOISE AMPLIFIER (TTA) GAIN

MEASUREMENT (REQUIRED)

The purpose of this test is to measure the gain of the TTA. The method will be to inject a

test signal into the transmit jumper cable using a receive channel frequency. This signal

will be coupled from the transmit antenna to the receive antenna and a reference power

level measurement will be made with the TTA “On” and a second measurement will be

made with the TTA “Off”. This is a relative measurement and the difference will be the

TTA gain value.

STEPS ACTION

MISCELLANEOUS

Select the RF GEN screen and configure

the following:

RF Gen Freq: Set as appropriate for

any assigned receive

frequency per SDO

(TX Freq –45 MHz).

Amplitude: 0dBm

Output Port: Dupl

AF Gen 1 & 2: Off

Verify a test cable is still connected from

the transmit jumper cable (normally

connected to the Bird Power Monitor

output port) and the Duplex out port on

the HP 8920.

Disconnect the Jumper at the TTA

Control Panel RF output labeled “ TO

RECEIVER MULTICOUPLER”.

Connect a test cable between the TTA

Control Panel RF out port labeled “To

RECEIVER MULTICOUPLER” and the

Antenna In port of the HP 8920.

Verify that the Power Switch on the

front of the TTA Control Panel is in the

“On” position.