Maxon Electronics Australia Pty. Ltd. MM-5500SU Manuel D’Utilisation

 

Frequency synthesizing part is composed of the first local RX IF synthesizer which is single mode 

PLL synthesizer and the internal Tx IF and Rx IF synthesizer which are in RFT3100 and S1M8656A 

chip. These parts generate the first local oscillation frequency, Rx IF frequency and Tx IF frequency. 

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First local frequency Synthesizer : 1372.08 MHz ~ 1419.54 MHz 

PLL loop is composed of single PLL synthesizer, Loop filter, VCO and VC-TCXO 

It generates transmission and reception frequency of 9551372.08 MHz ~ 1419.54 MH 

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Rx IF synthesizer : 367.2 MHz 

Rx IF PLL loop is consisted of PLL synthesizer in the PLL module, VCO built in S1M8656A, loop 

filter and VC-TCXO(Crystal oscillator 19.2 MHz). It oscillates twice the intermediate receiving 

frequency of 367.2 MHz and then generates 183.6 MHz, Rx IF frequency. 

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Tx IF Synthesizer : 267.2 MHz 

The configuration of PLL loop is composed of PLL Synthesizer, VCO which is internally installed, 

loop filter and VC-TCXO(19.2 MHz). It oscillates twice of the transmission intermediate 

frequency of 267.2 MHz and then generates Tx IF frequency of 138.6 MHz through the PLL loop. 

The frequency of 19.2 MHz generated from the VC-TCXO is the main clock of each the frequency 

synthesizer part. PLL frequency stability is determined by the stability of oscillator of VC-TCXO. This 

prevents maximum frequency variation from exceeding  ±2.0PPM. 

 

VCO

1372.08~1419.54MHz

TX_I &Q

VCTCXO(19.2MHz)

183.6MHz

AGC

267.2MHz

AGC

Quad

modulation

TX PLL

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Quad

Demodulation

I&Q

LPFs

ADCs

RX I&Q Data

367.2MHz