K1EL_AMR-75_使用说明书手册_2017

K1EL75 Meter AM Phone ReceiverAMR75FeaturesDescription.3.8MHz Amateur Phone Band ReceiverThe AMR75 is an experimental AM phone。100 KHz Tuning Rangeband receiver which makes use of a TDA7642Wideband Hi-Fi AM mode receptionTRF receiver IC along with a conventionalSingle Sideband mode with on board BFONE602 first mixer stage.The design providesUses single chip TRF TA7642 ICa wide bandwidth Hi-Fi output which isLow impedance 8 ohm speaker outputsuitable for listening to the AM groups that areMain tuning with separate Bandspreadpopular on 75 meters.The radio was designed.RF Gain and AF Gain controlsas a nostalgic callback to vacuum tube.9-12 VDC operationreceivers of the 1950s with main tuning,bandspread,455 KHz IF,BFO,and plenty of audio.Varactor Diode tuning◆NE6021 st Mixeroutput.This radio is called experimental sincethe builder may want to tailor the radio's.455 KHz IF with ceramic filterperformance by adjusting component values..TDA7052 audio amplifier ICAlso the builder needs to supply a suitableOn board 6 volt regulatorenclosure or open chassis platform.3NOHd WSL 73LXooOANT-Z CLO OOOHIR12Figure 1-Assembled AMR75 BoardAM75 Datasheet-A.36/112017Page 1