ATS R4500CD, Руководство пользователя, Страница: 18 / 52

Advanced Telemetry Systems, Inc. R4500C Reference User Manual R10-12-A 18
antennas on several or all frequency channels even with no signal present; you may want to increase the Channel
Delay time. If noise pulses are present, and the multiple antenna scanning sequence does not start, the Channel
Delay time is set correctly.
Setting the Channel Delay time longer gives more time for the R4500C to set a new threshold and optimize
sensitivity while at the same time ignoring noise. Setting it longer than necessary means the additional delay will be
added to every frequency channel scanned also increasing the time for all channels to be scanned. Thus the goal is
to set the delay so most, but not necessarily all noise pulses on every channel are ignored. Occasionally high level
noise will still pass no matter how long the delay is made.
Example of scan times with no transmitters present: Number of antennas used = 2. Time out = 3 seconds. Scan
time = 10 seconds. Number of frequencies used in table scanned = 10.
If the noise level is higher than the noise threshold level the R4500C has set, the noise will produce signal pulses
and the receiver will think transmitters are present and then cycle through the individual antennas. With no
transmitters in the area, but with noise pulses indicating possible presence of transmitters, the time for a scan of the
complete frequency table will be: Scan Time of antenna 0 + Time Out of antenna 1 + Time Out of antenna 2 = 10 +
3 + 3 = 16 seconds. For the10 frequencies in the table, the total scan time will be 160 seconds. (When an individual
antenna is selected, the noise level decreases and there should not be any noise pulses produced)
When using the default Channel Delay of 1000 milliseconds and there are no noise pulses above the threshold nor
are any transmitters present; the time of the frequency table scan will be: Channel Delay time + Time Out of
antenna 0 = 1 + 3 = 4 seconds. For the10 frequencies the total scan time would be 40 seconds. With the Channel
Delay set correctly, scan times can be reduced by allowing time for the R4500C to set the correct noise threshold
level.
Enter a numeric number from 0 to 5000 and press “ENTER” .
Pressing “ENTER” or “ESC” will return the screen back to the “Setup Menu”.
2.5 Ext Data
This optional feature is used when you want to dump data out hourly through a serial port to another device. This
screen is used to select the type of device you want to dump to. For this feature to be activated it will need to have
been selected for in screen 6 of the Stationary Setup.
Enter a 1 or 2 for the type of device and press
“ENTER”.
2.5.1 RDP – Remote Data Platform