Curry_kits_EXP-1750A_user操作说明书手册_1999

EXP1750aAGROOVY"SSB/CW TRANSCEIVER FOR THE 1750METER LONGWAVE BAND:160 KHz-190 KHz.Today's new technology provides use with the means of exploring our radio hobbywith far more case and success.Implementing this technology allows us to overcomemany of the limitations which had previously discouraged potential LOWFERS (LowFrequency radio cnthusiasts)from achicving successful results.I won't fool you.1750meters is not for the faint hearted!This band can be very noisy.filled with static,manmade interference.and carricrs.Add to this the FCC (part 15)regulations that limitour transmitter DC INPUT power to I Watt and the transmitting antenna length.including fecd line.to 50 fect.What to do?Why go to the troublc?Newer.bettertechnology overcomes many of these roadblocks and will provide you with the pearl inthe oy ster:a truly great band.well worth your effort.1750 Meters is fun.It has amazing ground wave propagation that allows cven lowpower levels such as these to travel surprisingly far (several hundred miles).When the band is quict.its REAL quict (you can hear a pin drop).All of this.andlicense free too.If you enjoy building clectronic kits.and "getting on the air".thenthis may suit your taste.In my opinion:this is irue Amateur Radio!WHO CAN YOU TALK TO?Currently there is quiet a few beacon stations across the country that send repetitivemessages and/or call signs.Call signs are usually created from the last three letters ofa Ham call sign.or your initials.Beacons are very helpful in determining bandconditions and propagation.SSB communication on the other hand has not been asquick to catch on.which leaves a gapping hole in terms of practical communicationSingle sideband is the best mode for voice communication.and works quiet well on1750 Meters.An example of this is the 9AM Saturday morning contact I enjoy withmy buddy.Randy Seden (call sign ELU)on 183.5 KHz.for the past 14 years.Talkabout regular contact!Recently.a growing number of new stations have joined ourlocal "nct".including DJL in Thousand Oaks (40 miles).and SB in Santa Barbara (90miles).It helps to have "radio"friends who live a reasonable distance from you tobecome involved in this project.thus insuring successful two-way communication.Distances in the 100 milc range are not uncommon for voice (SSB)communication.with (W (Morse code)casily doubling the distances of SSB.which is limitedprimarily by local noise.transmitting power.and more importantly:Your AntennaSrsiem'A key factor in successful operation is the use of a resonant antenna.Youmust use a resonant VERTICAL antenna for transmission or your signal will goNOWHEREI