User manual

RF Technology WinTekHelp User Manual Page 21
WinTekHelp User Manual 3.2.1.4 No Tone Period
frequency of the last IF stage before the discriminator. To “invert” a code before transmission, click on
the checkbox marked “Invert”.
.3.2.1.4 No Tone Period
Generally, at the end of transmission, an exciter will remove the tone from being generated before the
transmission is stopped. In this way, the receiver, if it has tone squelch, will kill its Squelch before the
RF ends, to stop the acoustic impulse caused by the step response of the audio circuit when there is a
sudden cessation of the Carrier. The length of this No Tone Period can be entered into this field.
The user can enter the number of milliseconds that they wish to use, or they can click at the top or the
bottom of the “Spin button” to the right of this field, in order to increase or decrease the value in
milliseconds.
.3.2.1.5 Tx Tail
In some repeater applications, it is useful to have an exciter remain keyed up for a period after PTT or
Loop has been released. This period can be entered into this field. The field is in units of seconds, but
fractions of a second can be defined with a decimal point, eg “2.2 seconds”.
The user can enter the number of seconds that they wish to use, or they can click at the top or the bottom
of the “Spin button” to the right of this field, in order to increase or decrease the value in seconds.
.3.2.1.6 Maximum Deviation
Exciters are required to limit the peak frequency deviation of the Carrier to any applied audio signal. The
level of this deviation is a function of the channel spacing and the frequency band.
Each exciter is factory configured with maximum deviations that range from 1.5Khz to 5.0kHz in 500Hz
steps. One can select the maximum 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 maximum deviations, from
which the user can select one.
Fig 12