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Modifications for the ICOM - RogerK

Modifications for the ICOM - RogerK

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---- gar keine Diode ----Breitband mit Ton-EncoderUSA: 144-148 und 430-450 Subaudible Tone-EncoderEUR: 144-146 und 430-440 1750HzBreitband:136-174 und 420-460 (RX und TX)Daher:Alle Dioden bis auf D102 entfernen. Wird auf den 1750-Tonruf verzichtet, auch D102 entfernen, so daá alle Dioden entfernt sind.Es geht dann der Subaudible-Ton-Encoder (nicht ..-Decoder!).Ergebnis: RX/TX-Breitband w.o., FM-Raster 5kHz/1kHz in VHF und UHF.Es empfiehlt sich ein CPU-Reset mit Neuparametrierung.Wegen der SMD-L”terei braucht's schon ein ruhiges H„ndchen, den richtigen L”tkolben mit der passenden Spitze, eine Pinzette,ggf. Arbeitslupe und zur Beruhigung einen Schluck Bier vorher (oder zwei).Alle Angaben ohne Gew„hr - versteht sich!Quelle: IC821H Service-ManualThis modification is read 801 times.top of page05-10-2000(IC-821) <strong>ICOM</strong> IC-821H X-Band modAuthor: Mark - pe3hmp@hotmail.com.MODIFICATION.NETThis mod can also be found on www.qsl.net/pe3hmp.On this page is <strong>the</strong> x-band (crossband) repeater mod discribed <strong>for</strong> <strong>the</strong> <strong>ICOM</strong> IC-821h allmode dualband tranciever with photo'sI have not done this mod myselve (yet) <strong>the</strong> schematics come from <strong>ICOM</strong> europe and <strong>the</strong> mod has been tested by WolfgangDJ9JY.You need to locate <strong>the</strong> row of diodes on <strong>the</strong> display board, <strong>for</strong> that You need to remove top and bottom covers of <strong>the</strong> 821(discribed in Your owners manual on page 50 and remove two screws witch hold <strong>the</strong> front of <strong>the</strong> 821 and turn <strong>the</strong> 2 o<strong>the</strong>r screws1/4 loose so You can pull <strong>the</strong> front towards You (about 5cm)Now You have to solder a diod in to <strong>the</strong> space reserved <strong>for</strong> D108.(1ss355) You can use one of <strong>the</strong> diods you have removed (d101-d107)As far as I know D108 is never in place as it leaves <strong>the</strong> factory.If this is Your first attempt to solder annything I would suggest to leave it untill You have alot of practiceIn this drawing You see were D108 should be placed

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