Tx/Rx Test - Furuno DS-30 Operator's Manual

TX/RX Test

4 TVG: ON/OFF
TRACKING MODE key turns on/off the TVG (Time varied
Gain) which is applied to the received echoes displayed in
item 3.
When the TVG is ON, propagation attenuation of sound in
water is compensated so that echoes from targets with the
same property are displayed in the same intensity irrespective
of depth where the targets are located.
5 SHIFT: 10
Shows gain for echoes displayed in item 3. Use the
TRACKBALL to change the gain.
The TX/RX checks the transceiver circuit and the transducer for each
beam.
When the speed readings measured by DS-30 are abnormal and
echoes shown in the continuous test seem weak for a particular beam,
the transceiver circuit or the transducer for that beam may be defective.
Conduct the beam test.
In beam FORE-STBD test, the ship's speed is measured by using the
fore beam and starboard beam, without using port beam. Likewise, in
beam STBD-PORT test, the fore beam is not used, and in beam
FORE-PORT test, starboard beam.
If, for example, the speed readings are normal in beam FORE-STBD
test but abnormal in beam STBD-PORT and FORE-STBD test, the
transceiver or the transducer for the port beam is faulty.
10-3
4 5
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