IFB Transmitter
FRONT PANEL CONTROLS AND FUNCTIONS
OFF/TUNE/XMIT Switch
OFF - The unit is powered off.
TUNE - Enables the up and down frequency buttons and
inhibits the transmitter section.
XMIT - Normal operation. In this position of the switch the
unit is transmitting a modulated signal to the corre
sponding receiver and the FREQ buttons are
locked out.
-20
0
XMIT
AUDIO LEVEL
OFF
FREQ
IFB TRANSMITTER
TUNE
POWERUP SEQUENCE
T5 Front Panel
When the unit is switched on (to TUNE or XMIT), the display cycles to:
1. “TEST MODE” momentarily illuminates all display segments (8.8.8.8.)
2. Momentarily shows firmware version number, (i.e. 4.0)
3. Displays frequency in MHz.
DISPLAY INTENSITY
The LED display brightness may be adjusted from 1 to 15, 15 being the highest intensity. To adjust the display inten-
sity, turn the power off then hold the FREQ up button while turning the unit back on. The display will show the current
setting. Use the FREQ up and FREQ down buttons to adjust the brightness setting. When finished turn the unit off,
wait until the display extinguishes (about 4 seconds), then turn the unit back on.
FREQ Buttons (Up and Down)
The transmitter frequency is changed with these momentary buttons. Each push will change the frequency in 100 or
25 kHz increments. The FREQ buttons are enabled when the OFF/TUNE/XMIT switch is in the TUNE position. They
are inoperative in the OFF and XMIT positions. When held in for more than 5 seconds, the speed of change increases
to about five channels per second. When the highest or lowest frequency is reached, the unit will wrap around and
continue in the same direction at the other end of the range. The T5 will “remember” the last channel used when
powered off and will come on at that frequency.
AUDIO LEVEL Control
Used to adjust the audio input level for proper modulation. The gain range is +/-15dB. The reference for this control
can be changed with the rear panel MODE switches. See the INSTALLATION AND OPERATION section for more
information on the MODE switches.
-20/0 LEDs
These modulation LEDS indicate the proper setting of the MIC LEVEL control.
-20 LED - Flickers or glows when sufficient audio is present.
0 LED - Lights up when the input level is high enough to cause limiting. The input limiter has a very high
overload threshold. Generally speaking, some limiting is desirable in normal operation to improve the
signal to noise ratio of the system. The limiting action is not audible and does not create distortion.
LED DISPLAY
For normal 100 kHz frequency spacing, this 4-digit display indicates hundreds of MHz to the nearest 0.100 MHz.
When the unit is programmed for 25 kHz spacing, the display indicates the six digit channel frequency which the unit
is tuned to by shifting digits. The display will normally indicate frequency to the nearest 0.1 MHz, the four most
significant digits and a decimal point. (example: 685.3) Frequency to .01 MHz resolution (fifth digit) is displayed by
pressing the FREQ UP or DOWN button. The display will shift out the first (100 MHz) digit on the left and shift in the
fifth (.01 MHz) digit on the right. (example: 685.3 shifts to 85.32 to indicate 685.325 MHz) The 5 kHz (.005 MHz) digit
(sixth digit) of the 25 channel spacing is not displayed but is determined from the 10 kHz digit. (example: 685.30 =
685.300, 685.32 = 685.325, 685.35 = 685.500, and 685.37 = 685.375)
The display LEDs indicate low input power by blinking continuously on and off when the input voltage drops below 11.0
volts. The transmitter will shut off when the input voltage drops below 8.0 volts.
Rio Rancho, NM – USA
5
(12 pages)
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