Radyne OM20 Specifications download pdf (Page 40)

OM20 Universal Outdoor Modem OM20 Theory of Operation

MN-OM20– Revision 5 4–2

4.1.1 OM20 L-Band Printed Circuit Card

The L-Band Printed Circuit Card consists of an analog modulation function, an analog complex

downconversion, and two wide-band digital synthesizers. The block diagram of the L-Band

Assembly is shown in Figure 4-2.

In the modulator, analog in-phase (I) and quadrature (Q) signals are generated on the Digital

Baseband Printed Circuit Card, routed to the L-Band/IF Printed Circuit Card, and modulated at

the desired frequency. The L-Band modulated signal is then passed through a microprocessor

controlled variable attenuator providing gain control of the output signal.

In the complex downconverter, the signal for demodulation is amplified and sent through a

variable wideband attenuator for AGC. The gain-controlled signal is then passed through a

complex downconverter to a low IF.

Quadrature

Demodulator

IF Board Connector (40-Pin Header)

Demodulator I

Demodulator I Inv.

Demodulator Q

Demodulator Q Inv.

AGC

L-Band

Synthesizer

(950-1750)

PDA

Analog Q Inv.

Analog I Inv.

L-Band

Synthesizer

(950-1750)

Quadrature

Modulator

Analog Q

Analog I

Q AA

Filter

I AA

Filter

Switch

RxLB

TxLB

L-Band

Coupler

DCSA

L-Band

Figure 4-2. L-Band Card Block Diagram

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Radyne OM20 Specifications Page 40

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