User manual
RF Technology WinTekHelp User Manual Page 9
WinTekHelp User Manual 3.1.1.2 Battery Level
If both the MSN and the LSN have values below 9, then they define the channel number as a two-digit
BCD number, with values from 00 to 99. For example, jumpers on “80”, ”10”, “02”, and, “01” defines
channel 93.
If the MSN is greater than 9, then the channel number is derived from the formula 16*MSN + LSN where
the LSN and the MSN are now hexadecimal numbers. This formula defines channel numbers 160 to 255
If the MSN is less than 10 and the LSN is greater than 9, then the channel number is defined by the
formula, 10*LSN + MSN. This defines channels 100 to 159.
.3.1.1.2 Battery Level
This is the voltage supplied to the exciter. It should be 28 +/- 0.5V. If this voltage falls below the Low
Battery Alarm Level, a low battery alarm will be generated. The Low Battery Alarm Level is a parameter
defined in Section 3.3.1, and it defaults to 24V.
.3.1.1.3 Ref Volts
The Analogue to Digital converters and the Digital to Analogue converters use a voltage reference, which
is nominally 4.096V at 25C. The calibration procedure performed on the units at the factory, sets the
actual reference voltage, which is stored in non-volatile memory. It is displayed here so that one can
convert voltages displayed, to actual DAC and ADC values.
.3.1.1.4 Firm. Rev.
This is the “Firmware Revision”. It has three fields. The first is the firmware revision itself expressed as
three numbers, in the form GG.RR.rr. These three numbers are referred to as the firmware’s Generation,
Release, and Revision. After this, the field contains the time and date when the firmware was actually
compiled.
.3.1.1.5 Model.
This field contains the Model name. This name is assigned at the factory, and cannot be changed, and
identifies what type of Exciter you have.
.3.1.1.6 Serial No.
Each Exciter is given a unique serial number, which is used to identify each unit. This is assigned at the
factory, and cannot be changed.
.3.1.1.7 Control Input Status.
This is a group of four buttons, referred to as Loop Detect, PTT, PTT Test, and PTT Microphone. These
buttons represent the physical state of the three separate Press To Talk (PTT) inputs and the Loop Detect
input (on the Line 1 Audio input). If any of these buttons has a tick mark, it indicates that the associated
physical input is asserted. Note that one or more of these buttons may be “ticked”.
If the current channel has been “programmed” (See Section 3.2), and it has a valid frequency for the
Power Amplifier attached, and if one of its control inputs are asserted, the exciter will “key up” (begin
transmission). In some alarm conditions, it is possible to have one or more of these buttons “ticked”, but
the Exciter may not “key up”.
.3.1.1.8 RF Output (Exciter).
There are four fields in this section, which describe the state of the RF pre-amplifier in the Exciter itself.
The button called “Transmitter On” is “ticked” if the Exciter is “keyed up”. In the “keyed up” state, the
Voltage Controlled Oscillators (VCOs) are turned on, the RF synthesiser output is enabled, a bias voltage
is applied to the first stage of the Exciter’s RF pre-amplifier, and the T/R Relay output is asserted low.
The frequency of transmission is selected by a combination of the Current Channel (see 3.1.1), and which
control input is asserted. Asserting PTT can generate a different frequency than that generated when any
of the other Control Inputs are asserted. The actual frequency being generated, is displayed in the field
referred to as “Frequency”.
The Exciter has a simple peak detector on its output, which it can use as a means of measuring the power
launched to the Power Amplifier. The peak detector cannot distinguish between Forward and Reverse
powers, so it is only an indication of the launched power. This simple power measurement is displayed in
the field referred to as “Pwr Out”.