DRAFT
DRAFT
3
2 OPERATING THE HT50 VHF HANDHELD RT
2.1 This Service Manual only contains operating instructions for those features of
the HT50 that are not normally available to the end user. For details of normal
operation please refer to the HT50 Operation Manual, E0XXXX.
2.2 Power ON Combination Functions. There are several functions available
which can only be accessed by pressing and holding down certain key
combinations and switching the radio on. These functions and their method of
activation are described below.
Second Mode. Second Mode (alternative country) – hold down Volume key
and press On.
First Key Beep. When a key is first pressed a beep can be generated. This
function can be toggled on and off by holding down the Squelch key and
pressing the On button. NB. This function can be disabled by
reprogramming the NVM, Section 7 refers.
Programme Mode. The radio is placed in Programme Mode for
programming and reconfiguration utilising a programming kit and a PC. Hold
down SCAN, UP and DW keys and press On. NB. This mode can only be
exited by switching the radio off and whilst in programming mode the radio
will not transmit or receive.
LCD Test Mode. Tests all legends – hold down Volume, Squelch, 16 and
Lights keys and switch On. As each key is operated the appropriate legend
appears. The radio will not transmit or receive in this mode and must be
switched off to exit the mode.
ATIS / DSC Test Mode (only available on special radios). Tone test
mode is activated by holding down the Volume and Scan keys and switching
on. Whilst in this mode the radio receives and transmits on channel 16.
Tests are initiated by pressing keys as follows:
SCAN Radio transmits a continuous ‘0’ tone (2100Hz) Display shows ‘00’
D/W Radio transmits a continuous ‘1’ tone (1300Hz) Display shows ‘11’
LITES Radio transmits alternating ‘010101’ tones Display shows ‘10’
16 Radio receives on channel 16 Display shows ‘16’
Battery Cycle Test Mode (only available on special radios).
The radio can be placed in this mode by holding down the UP & DOWN
keys. While in this mode the radio operates on channel 16 and performs as
follows
• 6 seconds receive at full volume unmuted
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