120 20110-142
Gemini
PD
Installation Guide
16
4.4.5.2
CTS signal is High indicator
The “Clear-to-Send” (CTS) indicator light, lo-
cated on the button bar (second indicator from
the left), is an RS-232 protocol port indication.
When lit, it indicates proper connection and that
the value is High. The DMP protocol used re-
quires that CTS be normally asserted.
4.4.5.3 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 number
is enabled (black). For each unavailable channel,
the round option button and channel number ap-
pears disabled (grayed-out). Only one channel at
a time may be selected.
Pressing the “Show All Channel Frequencies”
button opens a sub-window (see Figure 8) listing
in tabular form the radio transmitting and re-
ceiving frequencies programmed for each avail-
able channel(s).
To exit this sub-window, press the upper right
system box.
Figure 8 - Show All Channel Frequency
4.4.5.4
RSSI & Power Out Indicators
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 connec-
tor).
Meter precision is usually better than 3 dBm.
This indicator functions as a single column
"Power" (Watt) meter when using either of the
test functions: "TXON (Modulated)" or "TXON
(Unmodulated)" with a range of 0 to 60 watts.
Precision is usually better than +/-3 watts.
Note:
This internal wattmeter is designed for
use as reference only and is not a sub-
stitute for a quality external precision
measuring instrument.
4.4.5.5 TXON
tests
TXON test functions are selected by choosing
“Test” from the file menu, then “Modulated” or
“UnModulated” command or by pressing the
relevant button on the Toolbar.
4.4.5.5.1 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 trans-
mit an unmodulated 20-seconds test signal on the
channel selected or until the button is pressed
again.
The functions of all the other buttons are inop-
erative during test transmissions.
Power check:
1-
Connect an in-line power meter between the
radio and the antenna.
2-
Measure the forward (nominal 40W for UHF
model and 35W for 800MHz model) and re-
flected power levels by powering TX ON