MML_144-30-LS_(Manual操作说明书手册)

1ML144/30-S144 MHz 30 WATTLINEAR AMPLIFIERFEATURESDESCRIPTION30 WATIS OUTPUT POWER.This 144 MHz solid state linear amplifier,MML 144/30-LS has beenSUITABLE FOR 1 OR 3 WATTTRANSCEIVERS.introduced as a result of the advent of the many popular I and 3LINEAR ALL MODE OPERATION.watt 2 metre transceivers currently availableSTRAIGHT THROUGH OPERATION WHEN TURNEDWhen used in conjunction with such equipment this linearOFEamplifier will provide an output power of 30 watts.An internalULTRA-LOW NOISE RECEIVE PREAMPLIFIER -FRONTattenuator,controlled by a front panel mounted switch,allows bothPANEL SELECTABLE1 and 3 watt input levels,thereby affording maximum versatility.EQUIPPED WITH RF VOX AND MANUAL OVERRIDE.Several other switches controlling the internal switching circuitry,LED STATUS LIGHTS FOR POWER,TRANSMIT ANDallow the unit to be left in circuit at all times.The linear powerPREAMP ON.amplifier and low-noise receive preamplifier can both beindependently switched in and out of circuit.In this way,all fourSPECIFICATIONoperational combinations are possible.By means of an RF vox circuit the linear will automatically switchLinear Amplifieron to transmit,when 144 MHa drive is applied to the input socket.Itis possible to override this facility by the connection of an earth toPower output30 watts±1dBthe phono socket located on the rear panel.This connection isPower input1or 3 watts for full outputcompatible with all current transceiver PTT lines.The RF vox hasFront panel selectableswitched delay times for SSB and FM modes.Frequency bandwidth144-146 MHz at -1 dBPower requirements13.8V DC at 4 AmpsThe inclusion of the latest state of the art power transistor (rated atQuiescent current800mA (with zero drive)65W dissipation)guarantees highly reliable and ultra-linearperformance,thus making the unit ideal for all modes of operation.Receive Preamp(SSB,FM,AM CW).The PA transistor is thermally trackedagainst temperature variation and operational temperature rise.Overall gain12 dB typicalOverall noise figureBetter than 1.5 dBThe receive preamplifier uses one of the latest dual gate FETs in aFrequency bandwidth144-146 MHz at-1 dBnoise matched configutation.This technique,together with carefulReceive current200mAoptimisation of overall gain,makes the preamplifier ideal for useahead of any popular 2 meter transceiver.The sensitivity of currentGeneral2 metre transceivers is such that a preamplifier gain of 12 dB isRF connectorssufficient to ensure an excellent overall system noise figure.AS0239Size205x115x55mmpreamplifier with gain in excess of this figure will prove undulyWeight1.5Kgdetrimental to the strong signal-handling performance of thetransceiver.All circuitry is constructed on high quality glass-fibre printed circuirboard and protection is included against reverse polarity.The unit ishoused in a highly durable extruded aluminium enclosure,RFconnectors are located on the rear panel together with the powerlead and PTT phono socket.All necessary plugs are supplied.AMI