User manual

RF Technology WinTekHelp User Manual Page 22
3.2.1.7 Tone Deviation WinTekHelp User Manual
.3.2.1.7 Tone Deviation
Different tone panels and systems prefer CTCSS tones and DCS codes to be generated with different
deviations.
One can select the tone deviation to use by clicking on the button, with the upside down triangle, which is
to the right of this field. This opens a menu of available tone deviations, from which the user can select
one.
The actual tone deviation is set up at calibration to be a percentage of maximum deviation. Nominal
values of 15%, 14%, etc down to 3% are programmed into the exciter. As a consequence, the numeric
values shown are dependent on the choice of maximum deviation. For example with a maximum
deviation of 5kHz, the tone deviations will range from 150Hz to 750Hz in steps of 50Hz, but with 2.5kHz
maximum deviation, they will vary from 75Hz to 375Hz in 25Hz steps.
.3.2.1.8 High Gain
If the applied audio input signal is at a lower level than the usual 0dBm level, the user can switch in a
20dB-gain pad in the audio circuit. By clicking on this button, this extra gain pad will switch-in, when
this channel is selected, and the exciter keys up. (Note that this has no effect on tone signals, nor if the
microphone’s PTT button is pressed).
.3.2.1.9 Line Input
There are two transformer coupled audio Inputs, Line1, and Line 2. If these are enabled, then any audio
on one is summed (mixed) with the other.
These two inputs can be set to apply Pre-Emphasis to the audio signals, or to have a Flat frequency
response, or to be disabled altogether (eg if one is running the audio through the external tone input
instead). This selection is made by clicking on one of the three “radio buttons” referred to as “Pre-
Emphasis”, “Flat”, or “Off”.
3.2.2 Advanced Programming for the Exciter
If, from the dialog box shown in Fig 11, the user selected the button “Edit/Examine Channel Data with
Advanced features”, a dialog box such as that shown in Fig 13 would be shown.
.3.2.2.1 Channel No
See Section 3.2.1.1
.3.2.2.2 Both/Primary/Alternate
In the Advanced Menu, each channel can define two separate sets of data.
Normally, if the exciter keys up from PTT being asserted, it would generate the same frequency and/or
tone as it would if Loop was asserted. In this typical case, the “radio button” “Both” would be asserted.
If, though, one was to click on the “Alternate” button, one could define a different frequency, or tone
etc to use if PTT was asserted rather than Loop. When examining the data for such channels, the button
marked “Primary” would be “ticked” when scrolling through the channels, indicating that there is
Alternate Channel data, which can be viewed and edited by clicking on the “Alternate” button.
.3.2.2.3 Frequency
The user enters the frequency that the exciter will key up to in this field. This frequency must be between
25.0 and 50.0MHz, and it must be a multiple of 1.25kHz.
.3.2.2.4 CTCSS Tone or DCS Code
The user enters the CTCSS tone frequency that the exciter wishes to add to the audio, before modulation.
They can enter in the tone frequency in Hertz, or the EIA RS470 code. If no tone is entered, or a tone of
0Hz is entered, then no CTCSS tone will be generated.