Verifying Receiver Performance In Tta Operation - Motorola ASTRO 25 GTR 8000 Manual

b Increase the generate level to -47 dBm.
c Wait for Branch A to fail. Alarms may be generated during testing.
1 This can take up to two (2) minutes.
2 CSS Channel tab Time to Failure (sec) field controls the time to fail.
d Repeat step 8.
10 If no further testing is needed, place the base radio into Normal Mode, as follows:
a Click Change to Normal Mode.
b At the confirmation screen, click OK.
The base radio halts activity in the current mode and switches operation to the requested
mode.
11 Remove and restore the following connections to the base radio:
a Remove the service monitor GEN port connection from the base radio Antenna Port.
b Restore the antenna connection to the Receive Antenna Port.
5.11.4

Verifying Receiver Performance in TTA Operation

This procedure explains how to verify receiver performance in a system where a Tower Top Amplifier
(TTA) is present.
Consult with any documentation that is specific to your system for the value of TTA Reserve Gain. If no
information is available, use the following guidelines:
• For most situations, the TTA Reserve Gain should be in the 5 dB to 10 dB range.
• In the absence of guidance specific to your system, 7.5 dB is a useable value for TTA Reserve
Gain.
NOTICE: This procedure for TTA testing is valid only for FDMA operation. An entirely different
procedure for TTA testing is required for TDMA operation. Contact your system administrator
for guidance, then contact your Motorola Solutions representative for assistance.
The Receive path attenuators must be configured before performing this part of the procedure.
The Rx path to the Rx antenna on the tower must be complete.
When and where to use:
Use this procedure to verify receiver performance in a system where a Tower Top Amplifier (TTA) is
present.
Procedure:
1 Perform test setup:
a Configure the analyzer to generate an STD1011 pattern.
b Connect the Analyzer Gen port (3900) or the RF Generator Out port (S412E) to the TTA Test
Port using a TNC-m (3900) or N-m (S412E) to BNC-m test cable with known loss. Record the
cable loss value on the T tab, Test Cable #4.
c Configure the TTA so that the Antenna port is terminated in a 50 Ω load. If the TTA controller
has a time out feature for the termination, make sure you periodically reset the TTA
termination as needed.
2 Connect to the transceiver module in Configuration/Service Software (CSS) through an Ethernet
connection. See Connecting Through an Ethernet Port Link on page
3 If the base radio is not in service mode perform the following, otherwise go to the next step.
Chapter 5: GTR 8000 Base Radio Optimization
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