ASTRO-PHYSICS GTO KEYPAD 부록 - 페이지 4

{카테고리_이름} ASTRO-PHYSICS GTO KEYPAD에 대한 부록을 온라인으로 검색하거나 PDF를 다운로드하세요. ASTRO-PHYSICS GTO KEYPAD 10 페이지. Plus supplemental information for customers outside of north america and the revised gto quick star drift method of polar alignment

페이지 인쇄

Eastern Longitudes and Time Zone 12

There●is●an●additional●minor●remaining●issue●with●the●3=Get●Time/Loc●FrMnt●command,●but●it●should●be●of●no●consequence●

to●anyone●that●we●are●aware●of.●●●If●you●happen●to●be●in●time●zone●12●east●and●observe●daylight●savings●time●giving●an●

offset●to●GMT●of●local●time●–●13●hours,●AND●you●are●using●a●GTOCP1●or●2,●you●cannot●use●this●command.●●●Again,●all●data●

sent●to●the●mount●is●fine;●you●just●can't●have●the●keypad●poll●the●mount●for●your●time●and●location●data.

Eastern Longitude Limit

(see pp. 14-16)●●●●The●last●issue●will●only●affect●people●in●the●Fiji●Islands●and●in●far●north-eastern●Siberia.●●●Because●of●the●

longitude●issue●outlined●above,●an●eastern●longitude●above●178°●59'●00"●should●not●be●used.●●●At●this●time,●we●know●of●no●

one●who●is●affected.●●●

The International Date Line

The●region●on●either●side●of●the●International●Date●Line●(IDL)●has●the●potential●to●pose●some●problems.●●●●First●of●all,●the●

IDL●is●not●a●straight●line●at●exactly●180°●from●the●Prime●Meridian.●●●There●are●Pacific●Islands●(Tonga,●parts●of●Fiji,●Chatham●

etc.)●whose●longitudes●would●be●measured●as●West,●but●who●are●in●an●eastern●time●zone.●●●Likewise,●many●of●the●western●

Aleutians●are●actually●in●eastern●longitudes,●but●have●western●time●zones.●●●●The●keypad●will●not●allow●a●time●zone●greater●

than●12●or●a●longitude●higher●than●180°●either●east●or●west.●●●●Fortunately,●we●again●know●of●no●customers●in●these●

locations,●but●you●never●know...●●●This●is●where●we●would●have●to●trick●the●system.●●●●

Let's●say●you●have●taken●your●Mach1GTO●on●a●South●Pacific●Dream●Vacation●in●Tonga●at●175°●08'●West●Longitude,●but●at●

13●hours●east●time●zone.●●(Thank●goodness●there's●no●DST●in●Tonga!)●●●Since●you●want●to●begin●with●some●solar●observing●

you●decide●to●use●the●Daytime●Polar●Alignment●Routine●which●requires●accurate●time,●date●and●location●information●to●be●

successful.●(The●mount●must●know●the●exact●LST●to●know●the●RA●and●Dec●values●for●the●Park●Positions.●●(See●pp.●23-28)●●●

The●key●to●successfully●tricking●your●mount●is●to●remember●that●your●DATE●must●be●backed●up●by●one●day●if●in●a●western●

longitude●with●an●eastern●time●zone,●and●it●must●advance●by●one●day●if●in●an●eastern●longitude●with●a●western●time●zone.●●●

For●my●Tonga●example,●let's●assume●it●is●Feb.●15th,●and●local●time●is●3:15pm●(15:15:00).●●●●You●already●entered●the●correct●

longitude●of●175°●08'●15"●W●and●the●correct●latitude●of●21°●10'●47"●S●and●then●entered●the●time●zone●as●24●–●13●=●11●hours●

west.●●(The●keypad●will●assign●the●west●time●zone●because●the●longitude●is●west.)●●You●check●the●GMT●by●pressing●the●

4=Time/LST●button●and●see●that●it●correctly●reads●02:15:00.●●●The●problem●is●that●your●mount●will●be●calculating●LST●one●

day●off●amounting●to●about●●+4●minutes●of●LST●error●or●about●1°●off●(west)●in●your●Daytime●Polar●Alignment●Routine.●●●●To●

correct●this,●just●set●your●keypad's●date●back●to●Feb.●14th,●wish●everyone●Happy●Valentines●Day●once●again,●and●proceed●

with●polar●aligning●and●observing.●●●

Fractional Time Zones

There●is●no●provision●in●the●keypad●firmware●at●this●time●for●fractional●time●zones●as●are●found●in●Central●Australia,●Iran,●

Afghanistan,●India,●Nepal●and●several●other●locations.●●●To●get●proper●function●from●your●keypad,●you●will●have●to●adjust●

the●keypad's●clock●to●a●time●value●that●does●not●match●the●clock●on●your●wall.●●●The●important●thing●is●that●the●keypad●

calculates●the●correct●GMT.●●●

COMMAND LANGUAGE / TROUBLESHOOTING UPDATE

The●following●information●relates●to●servocontroller●issues●and●the●Astro-Physics●Command●Language.

Motor Stalls in GTOCP1 and GTOCP2s with the E1 or KE1 Chip

In●the●Troubleshooting●section●of●the●v.4.12●keypad●manual●dated●March●7,●2008,●on●page●69●under●the●"Motor●Stall"●

entry,●please●add●the●following●note●to●the●"Solution"●paragraphs:●●A●problem●was●discovered●in●the●E1●and●KE1●chips●(in●

GTOCP1●and●GTOCP2●control●boxes)●●that●makes●recovery●from●a●motor●stall●a●bit●more●problematic.●●This●ONLY●applies●

to●the●E1●and●KE1●chips.●●Initiating●movements●with●the●direction●buttons●does●not●always●fully●reset●the●stall●condition●

with●these●two●chips.●●If●you●experience●a●motor●stall●with●the●E1●or●KE1●chip,●it●is●recommended●that●you●power-cycle●the●

mount.●●The●mount●will●NOT●be●lost●if●the●scope●has●not●been●moved●by●hand.●