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DGPS MAX Reference Manual
98
F? Auto/Auto AA$
This menu displays the currently tuned frequency
(kHz) and modulation rate (bps) for the receiver’s
primary channel.
SS 54?SNR?26? ^
This menu item provides the signal strength (SS)
and signal to noise ratio (SNR).
The SS value is expressed in dB
µ
V and may be
considered a true signal strength as the calibration
factor of the CDA-2MAX antenna is 1:1. For
example, a 20 dB
µ
V signal level equates to a 20
dB
µ
V/m field strength due to the unity calibration
factor.
There is a direct correlation of signal strength and
signal quality, however, high signal strength may
not translate into good reception if there is
significant noise present. The SNR value is more
representative of signal quality.
The SNR is the height of the signal above the noise
floor, measured in decibels (dB). This value
effectively describes the reception quality, as a
signal is ‘louder’ if it is higher above the noise floor.
Interpretation of the SNR reading is discussed
further in Section 3.4.2.
MTP?100>?Q?25?
The menu item provides an indication of the
amount of successfully decoded differential data.
Two figures are provided – message throughput
(MTP) and quality (Q).
If reception is strong, all data will be decoded,
providing a 100% MTP. As reception becomes
Содержание DGPS MAX
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