Effective Receiver Sensitivity; Verify Receiver Performance For Apco Tdma Operation; Verifying Receiver Performance (Analog Operation); Verifying Receiver Performance In Tta Operation - Motorola ASTRO 25 GTR 8000 Manual

MN003286A01-E
Chapter 5: GTR 8000 Base Radio Optimization
b In CSS, click Start RSSI Measurement.
c Record the CSS RSSI Value in the RSSI Level Antenna field of the FDMA Chan sheet.
d Click Stop RSSI Measurement.
This Rx Noise Level is a relative value.
11 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.
12 Disconnect the Analyzer from the TTA.
5.11.4.1

Effective Receiver Sensitivity

The result sheet calculates the Effective Sensitivity (ERS) as the maximum of Gen Lvl Desense no Tx
or Gen Lvl Desense w/Tx, – Test Cable #4 loss - TTA Test Port Cable Loss - TTA Test Port Coupling
Loss.
Be sure to discuss this actual value with your system administrator to verify that there are no impacts
to the system talk-in coverage. Channel-to-channel variations should be within ±2 dB.
If this site is utilizing two Rx antennas in a fallback (not diversity) configuration, perform all the steps in
Verifying Receiver Performance in TTA Operation on page 187
a second TTA, connect to the second TTA test port. Leave the 1st TTA test port disconnected. For a
Dual Diversity TTA, disconnect the A side from the receive distribution system so that no signal is
present at the Rx A connection on the rear of the GTR 8000 Base Radio or the junction panel of the
GTR 8000 Expandable Site Subsystem. Fail Branch A by applying a high-level signal to Branch B and
wait for Branch A to fail.
Create a second Chan Result sheet by copying the original and labeling it Chan x – x Fallback Rx.
Ensure that the ERS for Rx B meets the coverage requirements too.
5.11.5

Verify Receiver Performance for APCO TDMA Operation

See chapter 5 in the Dynamic Dual Mode for TDMA Operation Feature Guide manual for TDMA testing
using the Aeroflex service monitor.
To perform a self-test of the receiver's sensitivity, see
Method) (IV and D) on page
5.11.6

Verifying Receiver Performance (Analog Operation)

When and where to use:
Use this procedure to verify receiver performance by measuring the receiver sensitivity (SINAD) for an
analog base radio.
190
192.
to verify that Rx B is functional. If using
Checking Receiver Sensitivity (Self-Test