Chapter 11
Using EV-DO Signal Analyzer
JD700B Series User’s Guide
401
Setting limit for RF tests
By default, test limits specified in the standard are set for you. You can change thresholds if you desire.
Procedure
1
Press the
LIMIT
hot key.
2
Press the
RF Test Limits
soft key.
3
Select the test item(s) and set the limit(s) depending on your selected measurement mode:
To set the limit for
Select
Set
Channel power
Channel Power
High Limit, Low Limit
Occupied bandwidth
Occupied BW
High Limit
Spectrum emission mask
Spectrum Emission Mask
(On/Off only)
ACPR
ACPR
(On/Off only)
Multi-ACPR
Multi-ACPR
(On/Off only)
Spurious emissions
Spurious Emissions
(On/Off only)
4
Optional
. You can enable alarm sound that goes off if the measurement falls outside of the limit.
Toggle the
Beep
soft key between
On
and
Off
to enable or disable the beep sound.
5
Optional
. Go to
SAVE/LOAD > Save
, and then select
Limit
to save the limit settings.
See “Using save” on page 35 for more information.
Conducting power vs. time measurements
The Power vs. Time (Idle Slot and Active Slot) in EV-DO Signal Analyzer verifies that the transmitter output
power has correct amplitude, shape, and timing for the EV-DO format.
◼
Idle Slot: Slot with no data in traffic channel.
◼
Active Slot: Slot with the loaded data in traffic channel.
Forward link of 1xEV-DO is a frame structure and each frame consists of 16 slots. The frame period for
1xEV-DO is 26.667 ms, which is also the period of one pilot channel. Each frame is divided into 16 slots of
1.666 ms. 1xEV-DO uses CDMA modulation scheme, but unlike its previous systems the Pilot, MAC (Media
Access Control), and Data (Traffic) Channel are not transmitted simultaneously; instead they are transmitted
in TDM (Time Division Multiplex).
Power vs. time (idle slot)
The Power vs. Time (Idle Slot) measurement provides the idle slot that includes the Pilot and MAC channels
with the masks in all regions.
After configuring test parameters as described in the “Configuring test parameters” on page 389, your
measurement result is displayed on the screen as like the following example,