ԽӢtwowayradioһ˫ƶͨŹߣڲҪκֵ֧£ͿͨûлѲԹ̶ƵͨĳϡԽĿǰࣺģԽֶԽIPԽ
ʷ
Խڷ঵ĶʮWestinghouseʵһλJohnKermodeԸŹֵķҡ쿪ʵԶּ죬ʱԵӼӦ÷ÿһ붼ʹ˸еǳ档뷨ŷԽǣԽеϢ˵ĵַ롣ΪKermodeĶԽʶƷǳļ򵥣һʾ֡1ʾ֡2ԴơȻַɻԪɵĶԽʶ豸һ(ܹⲢշ)ⶨźͿյķԵλȦʹòⶨķ
Kermodeõʱ·Ĺռ⡣աǿźţźš뵱ٶȵĵԪӦòͬǣKermodeôȦⶨ͡աһСһŶֽKermodeһоȦڽյաźŵʱһأڽյźŵʱͷſزͨ·ˣĶԽĶܴ󡣿һϵеļ̵ƣ͡ءɴӡŷϡַͨԽֱӶżзּ졣
˺󲻾ãKermodeĺDouglasYoungKermodeĻЩĽKermodeϢ൱ĵͣҺѱʮϵĲͬ롣Youngʹøٵ֮յĳߴ仯UPCԽʹĸͬճߴ硣µĶԽſͬСĿռһٸͬĵб룬Kermodeֻܶʮͬĵб롣
ֱ1949רвŵһNormWoodlandBernardSilverȫλԽŵļأ֮ǰרʼûжԽļ¼ҲûͶʵӦõNormWoodlandBemardSilver뷨KermodeYOungĴֱġ͡աʹ֮ɻ״ǳİӡͨɨͼεģܹԶԽŽ룬ܶԽŷĳ
רвϸĽĹУһλƻС˵Isaac-Azimovġ¶̫һнʹϢ·ʵԶʶʱǾôеĶԽſȥһӵ̣ǽĶԽרҵʿϻʶһάԽšȻ˶Խûз򡢶λͶʱȻʾǸϢܶȵֱ롣
ֱ1970IterfaceMechanisms˾ά롱֮󣬲˼۸۵ĶάԽĴӡʶ豸ʱάԽڱŰ̵ԶάԽӡֽϣɽһάCCDɨʶCCDĹֽϣÿض׼ֽĲͬÿظֽӡˢԽͬͼϲһܶϢͼַͬСĿռӡһһַΪKermode֮еһһʱϢҲڣǺġһϵͳг󣬰ӡʶ豸ڵȫ豸ԼҪ5000Ԫ
˺󲻾ãLED()΢ͼܵĲϷչӭµıʶ(ѧ)ӦõĴըǳ֮ΪԽҵҵûֱӽӴ׼ĶԽĹ˾ˡ
ԭ
ԽĹԭ£
1䲿֣
໷ѹVCOƵزźţŴ󣬼Ŵ󡢹ţƵʣߵͨ˲гɷ֣Ȼͨ߷ȥ
2ղ֣
ղֽƵķŴź໷Ƶʺϳ·ĵһźڵһƵƵɵһƵźšһƵźͨ˲һڵӲźš˲ĵһƵźŽƵоƬڶźٴλƵɵڶƵźţڶƵźͨһմ˲˳ɢźź󣬱ŴͼƵƵźšƵźͨŴ󡢴ͨ˲ȥصȵ·Ƶ·͹ʷŴŴõϢ
3źżƵ·
˵Ļͨ˷תƵĵź
4
CPUCTCSS/CDCSSźžŴѹеơռƵõĵƵźţһ־ŴƵĴͨ˲˲ΣCPUԤֵбȽϣƵźԤֵͬͬر

һʹ÷ʽϣΪֳ֡ء̶ʽм̡
ֳʽ߶Խ
һСᡢС߶ԽʺֳֻװڸЯннͨϵ书һVHFƵβ5WUHFƵβ4WͨžϵĿشʱһɴﵽ5ûʺϽĸֳԱ֮ͨϵߵ绰ϵУֳʽߵ硰ԽӦƷģԼռ80%ϡ
߶Խ
һܰװڳɻȽֱͨɳϵĵԴģʹóߵ߶ԽҪڽͨ䡢ȡָӵҵϴ󣬹ʲС10WһΪ25WΪVHFΪ56WUHFΪ50Wͨžɴﵽ20ϡ
м̨
м̨ǽյĳһƵεźֱͨķƵתȥ鲻ͬƵź໥Ӱ죬˵ܹûڲͬƵϽͨϵշͬʱ໥ŵȫ˫ص㡣
ͨŹʽϣͨŹĵ˫ͨŹ˫
ͨŹĵ߶Խ
ָͨͬһʱ̣Ϣֻܵд䣬˵˵ַͽֻܽ湤ͬʱߵԽ˫ָͨͬһʱϢԽ˫䣬ʹ绰һ˵ͬʱҲ˵
ӼϣģԽֶԽ
ߵԽƼ棬ɷΪģͨżƵģԽҲΪͳԽԼּƵֶԽ
ġ豸ȼϣҵߵԽרҵߵԽҵߵԽ
רΪߵ簮ʹöơߵԽԽֿɳΪҵĸߵҵ񣬸ҶרƵηҵߵ˶ʹáҹٵƵΪ144~146MHZ430~440MHZһҲһƵΡ200110Ϣҵߵַġл񹲺͹ߵƵʹ滮еĶҵߵ簮ߺҵҵר˵ҵҵ񣺹ҵߵ簮߽ѵ໥ͨźͼоߵͨҵҵߵ簮ϵָʽ׼ġߵ缼ȤˣȤϵ˰ö漰ıȡ󡣡ߵԽƵʷΧޣʹõĻʹҪרҵԽҵҪɫǣҪСɡҪȫɽƵɨ裬ֱƵʾƵʵ㡣似ָꡢ豸ȶԡƵȶԡɿԼҲרҵߵԽҪЩֱӽҵɱҲϵЩӦ˹Ҫ
רҵߵԽרҵߵԽʹߴȺŶӵרҵҵʹáˣרҵߵԽصǣܼʵáǶжͨŽӿڹûοƵʱộͨʹ޷ıƵʣʾֻŵֱʾƵʵ㣬ƵʵıԽϺãƵʵȶҲϸߣƵڳڹУȶԡɿԶϸߡ
塢ͨҵϣΪڶԽԽöԽöԽնԽ
ߵԽ
ڶԽ׳ΪöԽʹùڶԽ׼Ƶռ÷ѣͨѣκ˶ѡʹá๫ڶԽƵʡʼָ귽涼ȷĹ涨ΪڶԽ淶涨Խǰϲñ̲ܣĿǷֹûչƵʷΧ޸Ĺ涨ڶԽֻʾƵʾ乤Ƶʡͬʱ涨ڶԽʹõ300HZƵCTCSS׳Ʒ˽ߣԷֹͬƵʵĶԽĸš
߶Խ
߶ԽרΪ졢Ժ˾ȫءӡ侯˸ŽͨҵϵĶԽ
߶Խ
㷺Ӧˮˮ··ȼ͹ȡ𡢲涨λȹҵԶƵļ⡢ءϵͳСʹͲʮֹ漰񾭼ýķ棬Ⱥ͵ɵļأվļءˮĵˮ⡢ˮˮռйˮϵͳ⡢ˮϵͳء·ƼͨźŵƵļءվơ;ܼءܼءҵǱ߳Զ̵ˮ硢ٹ·ͨļءйĵȡ·źӦͨϵͳ·ˮпơGPSλGISϢ䡢רݴ䡢ļ⡢רжͨϵͳ֤ȯͨϵͳʵʱƱϵͳϵͳPOSֿļܡɽ桢̽ļ⡢ұ𻯹ϵͳĹҵԶơصȡЩϵͳ̨ͨԶ˲ɼʵʱɿط͵ģոĵĿָӶʵԶʵʱ͡ݴϵͳרõݴͨϵͳǲȱٵһ֣ںܶ£ǶʽװڸǱ豸нй
߶Խ
רںϺеں´Լ밶Ͻͨŵ߶ԽΪ߶ԽҲΪ̨
߶Խ
߶Խֽк̨רڵͷɻ֮䡢ԱԱ֮ͨϵģڱ֤заȫЧؽпнͨвȱٵͨŹߡ