GSM/GPRS/EDGE SIGNAL ANALYZER
60
JD7105B Base Station Analyzer
PREAMP:
Turns on or off the internal pre-amplifier. The pre-amplifier is to amplify a low-level
input signal. This soft key toggles between the
On
and
Off
. When it is turned on, the allowable
attenuation input range is 0 dB to 10 dB with 5 dB step. If user sets attenuation value beyond 10
dB, then the instrument will automatically turn off pre-amplifier to display low level signal properly
on the screen.
EXTERNAL OFFSET:
Sets an external offset value. An offset consists of a cable loss and a user
offset and the measurement result shows the value reflecting both offset values. When the
external offset value is set at 40 dB in the Spectrum mode, the measurement result compensates
40 dB at both the Spectrum Analyzer and Signal Analyzer modes.
Setting Sweep Mode
SWEEP
This hot key is used to set the sweep parameters. The user input window must be inactive first to get
the Sweep hot key function other than the number input.
SWEEP MODE:
Sets the sweep method. Toggle between
Continue
and
Single
.
Step
Description
1.
Set the sweep mode
SWEEP
[Sweep Mode]
Press the
SWEEP
hot key. It is the number 1 key in the
numeric keypad.
Press the
Sweep Mode
soft key. Toggle between
Continue
and
Single
.
Setting Trigger Source
TRIGGER
This hot key is used to select the trigger source among
Internal
,
External
, and
GPS
. It is the same
number 4 key in the numeric keypad functioning when the value input bar on the screen is inactive.
This key is not used in the Code Domain Power mode
.
Setting External Clock
To enhance the reliability of Code Domain measurements the JD7105B must be synchronized with the
Base Station. When an external clock is not supplied, the JD7105B works with a built-in internal high-
accuracy time base. In this case, some measurement results may exhibit inaccurate values. Therefore,