Codan-radio MT-4E Paging Manual de usuario descargar pdf (Pagina 51)

MT-4E PAGING SYSTEMS | USER GUIDE

Chapter 5: Technical Information Page 43

CONFIGURING CODAN MT-4E PAGING SYSTEMS

Codan MT-4E Paging Systems are typically pre-conﬁ gured for the customers’ application at the factory.

It is important to contact the Codan Service section before changing jumpers or adjusting levels. The

MT-4E transmitter and CI-PM-3 paging modulator are conﬁ gured as a matched pair and should only

be tuned together.

Setting the internal reference carrier frequency

When the CI-PM-3 paging modulators on-board OCXO is used as a stand-alone frequency reference, the

centre frequency of 10 MHz is factory-adjusted. Although altering this adjustment is not recommended,

if it is necessary, ensure that the instructions provided in the CI-PM-3 Instruction Manual are carefully

followed.

The transmitter requires that a kit is installed (A-PK-PM3) that adds a reference connector from the

front panel REF OUT SMA connector on the CI-PM-3 paging modulator to the REF IN SMA connector

on the transmitter.

Setting the 2-level or 4-level deviation

The CI-PM-3 sets these deviation levels by allowing different operational ampliﬁ er circuits to be pre-set

up to offset the carrier for the speciﬁ c deviation levels. The incoming digital signal (paging data) from

the paging encoder will turn the operational ampliﬁ er circuits on and off, allowing the carrier to be offset

at the speciﬁ c deviation levels.

Deviation levels for POCSAG are set at +/-4.5 KHz for wideband and +/-2.25 KHz for narrowband.

FLEX™ 2-level deviation is set at +/-4.8 KHz for wideband and +/-2.4 KHz for narrowband. FLEX™

4-level deviation adds +/-1.6 KHz for wideband and +/-0.8 KHz for narrowband. Multitone Mark IV / V /

VI and VII uses a deviation level of +/-4.5 KHz. Golay Sequential Code uses a deviation level of +/-5.0

KHz.

Conﬁ guring the external frequency reference

When a higher stability paging signal is required (for Simulcast operation), an external GPS or WWV

referenced signal is connected to the front panel REF IN SMA connector on the CI-PM-3 paging

modulator. This will discipline the on-board phase-locked loop OCXO oscillator.

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Codan-radio MT-4E Paging Manual de usuario Pagina 51