18
3.6.6 Info functions and signal quality monitoring
Four displays with parameters from the receiver can be displayed, namely the actual receive
frequency, the signal status, the battery status and the current vector. These will be described
below.
Actual frequency display
The actual frequency display shows the frequency to which the receiver is tuned with a
resolution of 1 Hz. This information might be valuable when troubleshooting.
Figure 3.15. Displaying the actual receive frequency.
The actual frequency display can be accessed as follows:
Step 1.
From the
receive
mode first enter the
menu
function by pressing the “
”
button a few seconds.
Step 2.
Press the “
▲
” button once so that the
info
submenu is selected (
figure 3.7
).
Step 3.
Hit the“
” select button and the actual frequency is shown (
figure 3.15
).
Step 4.
Press the “
” button twice to return to the normal receive mode display of
figure 3.1
.
Signal status display
The signal status display gives us an average Frame Error Rate (FER)
3
and Instantaneous
Frequency Deviation (IFD). The FER gives us an indication of the quality of the received
signal, while the IFD might be used in the case when strong RF interferers mess up the received
signal. Their purpose is thus mainly for troubleshooting.
Figure 3.16. Displaying the signal status, the frame error rate (FER) is 3 %,
the instantaneous frequency deviation is -11 Hz.
3
The FER is averaged over 128 frames, thus over 100 seconds. The FER is the percentage of frames
which contain an error.
