REPLACING Transmitter Batteries Isit rainy Saturday morning looking three transmitters $75 pile new batteries thought occurs almost anyone can little right kind information help first thing know whether batteries NEED changed some guidelines 1 If have using some kind battery tester test time has dropped half what transmitter new its time change same true test equipment panel meter trans mitter 2 If transmitter comes off charge meter needle pointing usual place drops rapidly much lower value soon put transmitter service have least bad cell Further evidence situation will fact transmitter will operate long time meter pointing low reading might lead think meter defective youd wrong think 3 Your charger may get lot hotter usual shorted cell pack causes happen 4 The obvious test voltmeter Most trans mitter battery packs contain eight nickel-cad mium cells should read about 10 volts charged see 85 9 volts should check cell pack find thats shorted might find two did 5 If rare few keep log expect replace batteries after have charged about 250 times same fashion have bill sale look suspicion pack going its fourth year service OK youve decided change transmitter batteries Clear space workbench twice large need Put down folded towel protect face transmitter Select proper size screwdriver screws holding back transmitter warm up soldering iron Step 1 usually unscrew remove antenna Turn antenna counter-clockwise holding box steady will no good Kraft some other sets use antenna must pulled out case screwed place make con nection thats situation face pull up antenna screw place Step 2 check again set turned off very important open back transmitter ON can short-circuit some very expensive parts before get back off set safe place Step 3 remove screws holding cir cuit board have get out way remove battery pack another oppor tunity damage something usually find circuit board can folded out way unsoldering wires always put piece foam rubber between circuit board transmitter case tape board place keep moving around knocking something out line Set 4 identify battery box lead connected plus end battery pack Its usually red make sure Mark piece tape necessary Now time remove battery pack transmitter different As can see pictures 1971 Pro-Line packs two glued transmitter case Cannon Cox/Sanwa boxes held bolts screws what must carefully Open battery box Pro-Line taped shut Cannon held shut bolts Cox/Sanwa closed either adhesive melting some plastic tabs Whatever yielded some careful prying knife blade Disconnect wires soldered battery pack Remove pack WARNING pack have removed DANGEROUS Let get short-circuited piece metal such transmitter case screwdriver things will get hot very fast Chuck pack garbage can short circuit cat-food can youve got garbage fire heat may cause cells explode throwing sharp-edged bits 20 Model Aviation Fig 1 Cannon transmitter antenna back removed Note equipment piacea folded towel protection scratches stop small parts bouncing away Battarias have wired nose-to-tail will stowed battery box above Medicine bottle collects nuts washers etc. foam rubber protects printed circuit board its components damage Fig 2 Cox Sanwa transmitter battery box removed X-Acto blade stuck glued seam must pried apart order get batteries Four screws bottom case hold battery box place stainless steel over place avoid trouble take ordinary light bulb connect pack bulb wont light will take pack down zero volts safely short pack permanently soldering piece wire plus minus Now can throw garbage Its too bad throw-away society doesnt have way recycle expensive material find away letus know about nickel-cadmium batteries equal widely believed time write Sanyo cells best price What you cant get case used General Electric CR-T cells nine make up Cox/Sanwa replacement pack used Eveready CFl5T cells make up packs forthe Cannon Pro-Line sets differ ence Both AApencells GE cells slightly larger diameter longer EV wont fit Cannon Pro-Line battery box thing check before lay money down Stay away bargain batteries un known labels cheaper reason Most often theyve shelf too long Cells dry out lose capacity over period time Most manufacturers recommend unused cells discarded after ten years shelf greenish-white salt deposit around plus seal usually reliable sign cell over-age brown deposit means cell useless Ill get some complaints about statements thats what experiences tell Going back paragraph GE EV cells fast-charge types can charge usual 45-ma rate 14 hours 150-ma 4 hours Makes no difference batteries like fast-chargers transmitter doesnt care use either Now its time make up new pack bought cells solder tabs welded did have solder cells noseto-tail plus minus string fold string fit battery box usually tape together Ive got right config uration put pack slow 45-ma charger 24 hours discharge 11-volt per-cell level checking cells go down significantly faster others Mark culprits leave pack re Fig 3 Pro-Line single-stick transmitter opened up battery replacement two battery boxes has pried out glue held transmitter case George used silicone adhesive put back because holds well enough relatively easy get loose necessary charge again Discharge again Recharge again Discharge again culprit still giving trouble replace youve got pack cells working together put transmitter Soldering cells tabs risky can done Try minimize time spent heating cell best way to work clean hot iron clean cell surface Use 60/40 rosin-core solder plate athin layer cell same wire will put cell Shake excess solder off end iron Put wire tinned spot cell put iron top just long enough make connection cell starts hissing gets hot stays hot take out circuit because its no good youve got far follow instructions backwards restore things Hope info useful Keep letters coming George Myers 7OFroehlich Fa rmRd Hicks vile NY 11801 Fig 4 Lou Stauch shows us new Liberty Sport built Frank Bacus Sig kit OS 60 Blackhead engine silk-covered finished acrylic lacquer Impact added flexibility two machine guns cowl Hobart Fuelersone fill other vent January1980 21 FCC LICENSE REFUNDS Beginning January 1980 mu lions citizens-band-radlo op erators paid up $20 license fees between 1970 1976 may begin receiving re funds Several years ago court struck down fees FCC now getting around reimbursing CB RC li cense holders get special booklet need apply refund write FCC Fee RefUnd Program Box 1788 Hyattsville MD 20788
Edition: Model Aviation - 1980/01
Page Numbers: 20, 21
REPLACING Transmitter Batteries Isit rainy Saturday morning looking three transmitters $75 pile new batteries thought occurs almost anyone can little right kind information help first thing know whether batteries NEED changed some guidelines 1 If have using some kind battery tester test time has dropped half what transmitter new its time change same true test equipment panel meter trans mitter 2 If transmitter comes off charge meter needle pointing usual place drops rapidly much lower value soon put transmitter service have least bad cell Further evidence situation will fact transmitter will operate long time meter pointing low reading might lead think meter defective youd wrong think 3 Your charger may get lot hotter usual shorted cell pack causes happen 4 The obvious test voltmeter Most trans mitter battery packs contain eight nickel-cad mium cells should read about 10 volts charged see 85 9 volts should check cell pack find thats shorted might find two did 5 If rare few keep log expect replace batteries after have charged about 250 times same fashion have bill sale look suspicion pack going its fourth year service OK youve decided change transmitter batteries Clear space workbench twice large need Put down folded towel protect face transmitter Select proper size screwdriver screws holding back transmitter warm up soldering iron Step 1 usually unscrew remove antenna Turn antenna counter-clockwise holding box steady will no good Kraft some other sets use antenna must pulled out case screwed place make con nection thats situation face pull up antenna screw place Step 2 check again set turned off very important open back transmitter ON can short-circuit some very expensive parts before get back off set safe place Step 3 remove screws holding cir cuit board have get out way remove battery pack another oppor tunity damage something usually find circuit board can folded out way unsoldering wires always put piece foam rubber between circuit board transmitter case tape board place keep moving around knocking something out line Set 4 identify battery box lead connected plus end battery pack Its usually red make sure Mark piece tape necessary Now time remove battery pack transmitter different As can see pictures 1971 Pro-Line packs two glued transmitter case Cannon Cox/Sanwa boxes held bolts screws what must carefully Open battery box Pro-Line taped shut Cannon held shut bolts Cox/Sanwa closed either adhesive melting some plastic tabs Whatever yielded some careful prying knife blade Disconnect wires soldered battery pack Remove pack WARNING pack have removed DANGEROUS Let get short-circuited piece metal such transmitter case screwdriver things will get hot very fast Chuck pack garbage can short circuit cat-food can youve got garbage fire heat may cause cells explode throwing sharp-edged bits 20 Model Aviation Fig 1 Cannon transmitter antenna back removed Note equipment piacea folded towel protection scratches stop small parts bouncing away Battarias have wired nose-to-tail will stowed battery box above Medicine bottle collects nuts washers etc. foam rubber protects printed circuit board its components damage Fig 2 Cox Sanwa transmitter battery box removed X-Acto blade stuck glued seam must pried apart order get batteries Four screws bottom case hold battery box place stainless steel over place avoid trouble take ordinary light bulb connect pack bulb wont light will take pack down zero volts safely short pack permanently soldering piece wire plus minus Now can throw garbage Its too bad throw-away society doesnt have way recycle expensive material find away letus know about nickel-cadmium batteries equal widely believed time write Sanyo cells best price What you cant get case used General Electric CR-T cells nine make up Cox/Sanwa replacement pack used Eveready CFl5T cells make up packs forthe Cannon Pro-Line sets differ ence Both AApencells GE cells slightly larger diameter longer EV wont fit Cannon Pro-Line battery box thing check before lay money down Stay away bargain batteries un known labels cheaper reason Most often theyve shelf too long Cells dry out lose capacity over period time Most manufacturers recommend unused cells discarded after ten years shelf greenish-white salt deposit around plus seal usually reliable sign cell over-age brown deposit means cell useless Ill get some complaints about statements thats what experiences tell Going back paragraph GE EV cells fast-charge types can charge usual 45-ma rate 14 hours 150-ma 4 hours Makes no difference batteries like fast-chargers transmitter doesnt care use either Now its time make up new pack bought cells solder tabs welded did have solder cells noseto-tail plus minus string fold string fit battery box usually tape together Ive got right config uration put pack slow 45-ma charger 24 hours discharge 11-volt per-cell level checking cells go down significantly faster others Mark culprits leave pack re Fig 3 Pro-Line single-stick transmitter opened up battery replacement two battery boxes has pried out glue held transmitter case George used silicone adhesive put back because holds well enough relatively easy get loose necessary charge again Discharge again Recharge again Discharge again culprit still giving trouble replace youve got pack cells working together put transmitter Soldering cells tabs risky can done Try minimize time spent heating cell best way to work clean hot iron clean cell surface Use 60/40 rosin-core solder plate athin layer cell same wire will put cell Shake excess solder off end iron Put wire tinned spot cell put iron top just long enough make connection cell starts hissing gets hot stays hot take out circuit because its no good youve got far follow instructions backwards restore things Hope info useful Keep letters coming George Myers 7OFroehlich Fa rmRd Hicks vile NY 11801 Fig 4 Lou Stauch shows us new Liberty Sport built Frank Bacus Sig kit OS 60 Blackhead engine silk-covered finished acrylic lacquer Impact added flexibility two machine guns cowl Hobart Fuelersone fill other vent January1980 21 FCC LICENSE REFUNDS Beginning January 1980 mu lions citizens-band-radlo op erators paid up $20 license fees between 1970 1976 may begin receiving re funds Several years ago court struck down fees FCC now getting around reimbursing CB RC li cense holders get special booklet need apply refund write FCC Fee RefUnd Program Box 1788 Hyattsville MD 20788