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Test sensitivity
In the Test sensitivity mode, the test box outputs a modulated signal on VHF channels 6, 13, 16,
67, 18 and 28 as default. Using Futronic MKll Manager,
Sensitivity
tab,
the default channels can
be set to any number between 00
– 28 and 60 – 88, 2006, 2019, 2020, 2024 – 2028, 2078,
2079, 2084, 2085 respectively. With an external attenuator (not supplied with the test box) this
test can be used to check the sensitivity of a ship's VHF radio. The modulated signal can be
heard and checked in the radio’s speaker as a 1 kHz tone.
Use the setup below. It is very important to use coax cables for the connection of the
equipment.
Select
“Test Sensitivity”
and press
“OK”
. CH 06 will appear as the default channel in the
display. Other channels can be selected by pressing
↑
or
↓.
At the desired frequency, press
“OK”
and the test box will keep sending the modulated signal.
To stop the transmission, press
“EXIT”
.
For reference, the test box RF output level is approx -45 +/- 2 dBm. In order to match with the
sensitivity of a ship’s radio (approx. -115 dBm), the attenuator to be used should be approx
-70 dB.
To simply check if the 1 kHz-modulated signal is well received over the air, use this setup:
VHF RECEIVER
ATTENUATOR
ANT.
VHF RECEIVER
ANT.
Summary of Contents for Futronic MKII
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