2400 CASE MODEM CHECKS & TEST

A.Gabriel 9/11/95
Modem Information Modulation Demodulation us people modulate in analogue, for something to hear us it has to convert our analogue voice to Digital format before it can travel across digtal network, hence ADPCM comes into play to do this dogey task.
Analouge2Digtal Pcode Modulator.2MB of it at time. But still Digital can not tralvel on its own through the Air we breath, it needs someone to carry it, this is where RF amps watts frequency come in handy to create an RF platform for the Digital stuff to work on. Boom Boom Done
                     
2400 CASE MODEM CHECKS & TEST

CHECK TRANSISTOR LM2940CT:

LOOP BACK KRONE BLOCK:

Connect either A or B Modem TX RX Paths together to create loop

COMMS TEST:

Bring down the Rig Delete everything out, just type the password and enter
do not bring rig up just type COM for COMMS test.

2400 CASE MODEM CHECKS & TEST

Cicuit Board Fault

Using Electronic Multimeter

CHECK TRANSISTOR LM2940CT: (Power Regulator Transistor)

Lead Connector

LOOP BACK KRONE BLOCK: (Using Small Double Sided Connectors Link TX and Rx)

Connect either A or B Modem TX RX Paths together to create loop

COMMS TEST:

Brief

Bring down the Rig/Site Delete everthing out, or MAN the Rig/Site just type the password and enter do not bring rig/site up just type COM for comms test.

TXD and RXD Leds should flash rapidly.

MAN IN THE MOON (nudge nudge wink wink)

PASSWORD

COMM

Look at Modem Response Should see Flashing on LEDS CTS TXD RXD

@A.Gabriel Oct 95