Manual

TECHNICAL NOTES
TECHNICAL NOTESTECHNICAL NOTES
TECHNICAL NOTES


www.qtech.co.nzTel033663713
TECHNICAL NOTES
TECHNICAL NOTESTECHNICAL NOTES
TECHNICAL NOTES
ThissectiondescribesthetechnicalaspectsofQ80Modulepowersupplyandmodeminterface.
Power Supply
Power SupplyPower Supply
Power Supply
The Q80Moduleis designed tooperate withaDC powersupplyvoltage of nominally12 volt. The Q80 Module
drawsapproximately80mAinStandby,100mAonReceiveand1.2AonTransmitat5Wattsoutput.
The DC power supply to the Q80 Module must be adequately smoothed and be free from noise and voltage
transients.WheretheDCsupplyisderivedfromtheACmains,orbatterieswithanassociatedACmainsbattery
chargerthesedevicesmustcomplywiththerequiredelectricalregulations.


LocationofPowersupplycircuitry.
The above diagramshowsthelocation of the Q80 Module powersupplycircuit located at thebottom right hand
side of the Q80 Motherboard as view with the front panel BNC RF connector to the right.  The power supply
connectorP1isa3wayconnectorlabelled‘PWR’onthebottompaneloftheQ80Module.Theconnectionstothe
powerconnectorare:
CTL PinNo1-TheremotepowerON/OFFcontrolinput.
+IN PinNo2-Thepositiveleadofthepowersupply.
G PinNo3-Ground,thenegativeleadofthepowersupply.


CircuitdetailsofPowerSupplyFrontEnd.
Inthe abovecircuitdiagram the15 volt zener diodeD1and the 2 ampfuseF1 protect theQ80 moduleagainst
reversepowersupplyconnection,overvoltageandtransientvoltages.Thefuseisaplug-in2ampTE5fuse.