SOCIETA’ ITALIANA COSTRUZIONI ELETTRONICHE S.r.l.
VIA TAZIO NUVOLARI, n° 53 - 55061 CARRAIA - (LU)
W e b s i t e : w w w . s i c e t e l e c o m. i t
ISCRIZ. TRIBUNALE LUCCA N. 8661 - C.C.I.A.A. N. 103668
P. IVA 00871160461 - Tel. 0583 980787 - Fax 0583 981495
E - M a i l : i n f o @ s i c e t e l e c o m. i t
Note:
If it is required to modify the Modem parameters, because not all Modulation Indexes MI (QAM
values) are supported in all Channel Spacing CS (for CS = 14 and 7 MHz the max MI supported is
256QAM), to avoid that the modification commands are refused for some transition it is recommended to set
up or modify MI (QAM) first and afterwards modify with a second <Apply> the CS.
Note:
When enabled the Radio Loopback cuts the link operation. A WARN indication is set on Status LED.
Tests with RF Loop should be enabled with fixed modulation and QAM≤256.
2.8.1
Radio Frequency Seeker
For Unlicensed Bands (RADIOLINK EVOLUTION 917 and 924) a radio frequency seeker tool is available to
help the operator to determine the optimum working conditions for a link (i.e. frequency
selection where interference from other systems is minimum). The tool is specifically designed
to be used at the system installation and/or when it is required during the life of the link to re-
optimize its operating conditions This tool can be started clicking on the <Radio Frequency
Seeker> button in the Frequency area of the Radio Interface window: the dedicated pop-up
window of Fig. 2.7 will open.
Important: run the tool only in „Administrative status‟ UP (ATPC function OFF).
Figure 2-6: Radio Frequency Seeker window for Unlicensed Bands
Step1)
A set of TX and Rx frequencies is initially manually configured in the two terminals using
the
Frequency
area allowing the system to start to communicate, even if in a non-optimal
condition.
Step 2)
It is possible now to perform a scan, searching for possible interferences along the
available RX bandwidth. During this process transmitters are switched off and no traffic
flows. The equipment will analyze and record in both stations the received power level for
each channel. The bar show the progress of the scan process up to the end (100%).
Step 3)
At the end of the scanning process, the system will turn on transmitters and it is possible
to display the results of the scan for both the terminals (A=Local – B= Remote) of the link
either as a graph (click on
Show Graphics)
or as a Table (click on
Show Tables).
Step 4)
In the
Found Frequencies
fields the tool suggest the pair of frequencies (Tx and Rx)
where the analyzer recorded the lower interference power level. It is now possible to
