2 INSTALLATION MECHANICAL HF SSB TRANSMITTER T2130
- When the handset key is released after a transmit period.
- When the T2130 is ready to transmit after the ‘TX’ and ‘Tune’ keys have been activated.
- When the ‘Enter/Stop’ key is pressed while the Automatic Power setting or the tuning of the AT2110
takes place.
OPEN AERIAL
This command sets the relays in the AT2110 so that the aerial is disconnected from the HF SSB
radiotelephone.
SERVICE
This command is always given associated with a service subcommand. There are several service
subcommands, each corresponding to a given Service Programme. The answer consists of option (A) or
(B) followed by 5 ASCII characters which are displayed in the lower part of the display in the RE2100.
2.3.3.2 AUTOMATIC POWER SETTING
MOTIVE FOR THE AUTOMATIC POWER SETTING
The automatic setting of the power level is done to ensure the maximum RF-level out of the transmitter
T2130, regardless of
- variations in the RF-level out of the RE2100 exciter,
- RF-loss due to long cables between RE2100 and T2130,
- variations in the gain in the Power Amplifier from one to another,
- variations in the gain in the Power Amplifier due to the frequency,
- variations in the loss in the Output Filter module from one to another,
- variations in the loss in the Output Filter module due to the frequency,
- battery voltage supplying the Power Amplifier.
(variations in the DC loss in the Power Supply).
PRINCIPLES FOR THE AUTOMATIC POWER SETTING
The RF-level out of the RE2100 exciter is increased in steps until a predetermined maximum allowable
Vforward level out of the Output Filter (2) is reached.
EVENTS FOR STARTING THE AUTOMATIC POWER SETTING
The automatic power setting is done because of one of the following events:
- The TX-frequency is changed and the key on the handset has been activated.
- The TX-Tune key on the keyboard is pushed.
- The time elapsed since latest automatic power setting is more than approx. 4 minutes.
NECESSARY SIGNALS AND PARAMETERS
- Vforward.
The RF-level is measured by SWR-detector circuitry on the Output Filter (2) and is mentioned as
‘Vforward’. Vforward is measured by the TX-processor (3) by means of an analog to digital converter.
9315
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