Intek H-520 PLUS Owner's Manual page 9

16. SP (Speech Processor) Key
The ESP (Electronic Speech Processor) is a unique feature available in some INTEK two-way CB radios. ESP means
Electronic Speech Processor, in other words electronic modulation processor. This audio processor is microprocessor
controlled and it is also called COMPANDER (Compressor-Expander). It works as a modulation compressor in transmit
mode and as a modulation expander in receive m ode. The ESP allows to obtain a stronger, clear and clean audio signal
and it is a great help in noisy areas and in case of weak signals or in long distance communication. The efficiency of
ESP is even greater when both stations use this device. The 2nd generation ESP allows to enable only the TX
compressor, only the RX expander or both systems.
To enable or disable the ESP functions, press the SP key (16), as follows :
1) Press the key once to enable the TX modulation compressor. The ESP C (M) icon will appear on the LCD.
2) Press the key again to enable the RX modulation expander. The ESP E (M) icon will appear on the LCD.
3) Press the key again to enable both the TX modulation compressor and the RX modulation expander.
The ESP C E (M) icon will appear on the LCD.
4) Press the key once again to disable all systems.
ESP performance
of the modulation
in RX and TX modes
17. LOCK Key
Press the LOCK (17) key for a few seconds to enable the keypad LOCK function. Press the key again to disable.
18. SCAN Key
Turn the SQL (2) control clockwise until the background noise is cut, otherwise the automatic SCAN function cannot
start. Press the SCAN (18) key to start the automatic channels scanning. The SCAN (H) icon will appear on the LCD.
SCAN will automatically stop when a signal is detected on one channel, in order to listen to the communication and
SCAN will re-start when no more signal is detected on that channel. Shortly press the PTT (21) key within 5 seconds if
you want to stay on that channel, otherwise SCAN will re-start. If you have no interest on the communication on that
channel, just press the UP (9) or DN (10) keys and SCAN will immediately re-start upward or downward. To exit the
SCAN mode, shortly press the PTT (21) key. You may also SCAN the memory channels only, just recall one of the
stored memory channels (refer to ME Key), then enable and start the SCAN function.
19. LIGHT Key
Press the LIGHT (19) key to backlight the LCD display, press the key again to switch OFF backlight. Select the desired
LCD display backlight mode as indicated at item 7. LCD Display Backlight Setting.
Controls, Indicators and Operation
Modulation without ESP
100%
0%
100%
- 7 -
Modulation with ESP