RF Technology R150 Betriebsanleitung PDF herunterladen (Seite 24)

Page 24 RF Technology T70/T150

7.4.19 T/R relay Driver 7 SPECIFICATIONS

7.4.19 T/R Relay Driver

An open collector transistor output is provided to operate an antenna change over relay

or solid state switch. The transistor can sink up to 250mA.

7.4.20 Channel Select Input / Output

Coding - 8 lines, BCD coded 00 - 99

Logic Input Levels - Low for <1.5V, High for >3.5V

Internal 10K pull down resistors select channel 00 when all inputs are O/C.

7.4.21 DC Remote Keying

An opto-coupler input is provided to enable dc loop keying over balanced lines or

local connections. The circuit can be connected to operate through the 600Ω line or

through a separate isolated pair.

7.4.22 Programmable No-Tone Period

A No-Tone period can be appended to the end of each transmission to aid in

eliminating squelch tail noise which may be heard in mobiles with slow turn off

decoders. The No-Tone period can be set from 0-5 seconds in 0.1 second increments.

The No Tone period operates in addition to the reverse phase burst at the end of each

transmission.

7.4.23 Firmware Timers

The controller firmware includes some programmable timer functions.

Repeater Hang Time - A short delay or “Hang Time” can be programmed to be

added to the end of transmissions. This is usually used in talk through repeater

applications to prevent the repeater from dropping out between mobile transmissions.

The Hang Time can be individually set on each channel for 0 - 15 seconds.

Time Out Timer - A time-out or transmission time limit can be programmed to

automatically turn the transmitter off. The time limit can be set from 0-254 minutes

in increments of one minute. The timer is automatically reset when the PTT input is

released.

7.4.24 CTCSS

CTCSS tones can be provided by an internal encoder or by an external source

connected to the external tone input. The internal CTCSS encoding is provided by a

subassembly PCB module. This provides programmable encoding of all EIA tones.

Some models encode certain extra tones. Tone frequencies are given in table 4.

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The reverse phase burst is usually sufficient to eliminate squelch tail noise in higher-quality mobiles.

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RF Technology R150 Betriebsanleitung Seite 24