Enhanced vox ticks, Enhanced vox telephone line transmit timer, Enhanced vox receive recovery delay – GAI-Tronics MRTI 2000 (No. PL1877A) Microprocessor Radio Telephone Interconnect Installation & Service Manual User Manual
Page 35: Enhanced vox delay, Vox detection threshold, I0 db extra gain for phone audio
PL1877A Microprocessor Radio Telephone Interconnect
PC Programming
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Enhanced VOX Ticks
If enabled, short attention-getting “ticks” are sent to the landline party upon initial access on mobile
originated calls. These ticks allow time for the mobile operator to inform the landline party that they
cannot speak while the mobile is speaking. It is applicable only when Mode of Operation is Enhanced
VOX.
Enhanced VOX Telephone Line Transmit Timer
Limits the continuous, uninterrupted talk time from the landline to mobile to 30 seconds. This allows the
mobile to maintain control of a simplex radio patch. Its use is required by Federal rules in most cases.
Consult applicable regulations before disabling.
It is applicable only when Mode of Operation is Enhanced VOX. The default for the Enhanced VOX
Transmit Timer is enabled.
Enhanced VOX Receive Recovery Delay
Determines "dead time" between station transmit and receive mode. This is necessary to allow time for
the station receiver to fully recover after PTT is released (the landline user pauses). An insufficient
delay time may cause false carrier detects to the interconnect. It is applicable only when Mode of
Operation is Enhanced VOX.
Enhanced VOX Delay
The time telephone line audio is delayed before being presented at the TX audio port. Delay time may
be set to the minimum time that will ensure no loss of syllables due to transmitter turn-on times and/or
delays. Normally, it is set to 500 ms. It is applicable only when Mode of Operation is Enhanced VOX.
The valid range is 0–500 ms.
VOX Detection Threshold
Alters the Enhanced VOX detection threshold. The threshold is the minimum level required to activate
the transmitter PTT. High is –30 dBm; low is –45 dBm. It is applicable only when Mode of Operation
is Enhanced VOX.
I0 dB Extra Gain for Phone Audio
This can be selected to boost the phone audio level, if necessary. Applicable only when Mode of
Operation is Enhanced VOX.