120 20110-100
Gemini/PD Installation Guide
15
4.4.4 Test
Functions
The following RIS functions and buttons are
used to carry out testing or trouble-shooting on
a connected unit:
•
Channels select
•
Show All Channel Frequencies
•
RSSI Indicator
•
TXON (Modulated)
•
TXON (Unmodulated)
•
Ping Address and Ping button
4.4.4.1 Channel
Selection
Select the radio channel on which you wish to
send a test transmission by clicking the relevant
available option button.
The program automatically detects which of
sixteen channels are present on the connected
unit. For each factory-set channel available, the
relevant round option button and channel num-
ber is enabled (black). For each unavailable
channel, the round option button and channel
number appears disabled (grayed-out). Only one
channel at a time may be selected.
Pressing the “Show All Channel Frequencies”
button opens a sub-window listing in tabular
form the radio frequencies programmed for each
available channel(s).
4.4.4.2 RSSI
Indicator
The Radio Signal Strength Indicator (RSSI) bar
graph usually displays in twin-columns the rela-
tive strength (in dBm) of an incoming RF signal
on the selected channel.
The left column indication, labeled "I", shows
the transceiver RX signal (rear mini-UHF con-
nector).
The right column indication, labeled "II", shows
the auxiliary RX signal (front mini-UHF con-
nector).
Meter precision is usually better than 3 dBm.
This indicator functions as a single column
"Power" (Watt) meter when pressing either of
the test buttons: "TXON (Modulated)" or
"TXON (Unmodulated)" with a range of 0 to 60
watts.
Precision is usually better than +/-3 watts.
4.4.4.3 TXON
tests
4.4.4.3.1 Unmodulated
Carrier
Unmodulated carrier gives a clear carrier and is
frequently used for checking:
•
Frequency error
•
Forward and reverse power
Press the TXON (Unmodulated) button to
transmit an unmodulated test signal on the
channel selected for 30 seconds or until pressed
again.
The time remaining to test transmit is displayed
on the status bar. The functions of all the other
buttons are inoperative during test transmis-
sions.
Power check:
1-
Connect an in-line power meter between the
radio and the antenna.
2-
Measure the forward (nominal 40W) and
reflected power levels by powering TX ON.
Never exceed 1W of reflected power.
4.4.4.3.2 Modulated
Carrier
Test transmission generates a carrier modulated
with 1kHz sinewave, at deviation level that de-
pends on model and network speed:
Table 3 - Carrier Modulation
Carrier Modulation
Full Channel
Network Speed
Typical Deviation
19200
± 4.0 kHz
16000
± 4.0 kHz
9600
± 3.0 kHz
Half Channel
Network Speed
Typical Deviation
9600
± 2.5 kHz
