2 INSTALLATION MECHANICAL HF SSB TRANSMITTER T2130
26190
Fig. 2. Nominal values of the Vbattery, Vforward maximum.
FUNCTIONAL DESCRIPTION OF THE CALIBRATION
A Vbattery = 24,000 Volt must be present at the ‘+’ and the ‘-’ 24 Volt battery terminals on the Connection
Board (6).
The Service Programme for calibrating ensures that the two tone RF-signal is present at the internal
dummy load in the T2130. The level of the two RF-signal is now increased by use of the keyboard on the
RE2100 until specific requirements for the intermodulation is just fulfilled.
At this point the TX-processor is ordered to measure the actual battery voltage and the actual Vforward
voltage. When this is done some calculations take place.
Concerning the Vbattery an offset is calculated. This offset is the difference between the nominal Vbattery
and the meaured Vbattery.
Concerning the Vforward an offset is calculated. The offset is mentioned in the subsection above as
Vf_max2.
Vf_max2 is the difference between the nominal value of Vf_max1 at Vbatt = 24,000 Volt and the measured
Vforward.
MEASURING THE BATTERY VOLTAGE
As the battery is galvanic isolated from the ground it is not possible for the TX-processor to measure the
battery voltage direct.
The TX-processor (3) is measuring the voltage ‘+24V Sense’ and an offset is added. The offset added
is a result of the calibration described in section 2.3.3.5. CALIBRATION OF THE T2130.
In the Power Supply (4) the ‘+24V Sense’ is generated.
The DC to DC converter in the Power Supply is working after the ‘Pulse Width Modulation’ principle. The
peak voltage on the secondary turn of the isolation transformer is then proportional to the voltage switched
on the primary turn. The ‘+24V Sense’ is then proportional to the battery voltage.
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PAGE 2-35
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