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| − | [[Image:Bc898T.gif|thumb|BC898T Trunktracker III Scanner Discriminator Tap Modification]]
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| − | ==Introduction==
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| − | This document is about installing a intermediate frequency tap in a [[BC898T]].
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| − | This document will not explain the theories behind [[Discriminator output]] or the
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| − | [[Trunked Radio Decoders]] used with discriminator taps.
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| − |
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| − | ==Credits==
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| − | Credits to Anthony W. Waukap of http://myweb.accessus.net/~090/bc-780xlt.html
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| − | His work on the BC780XLT was the starting point of my quest to install the tap of the BC898T.
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| − | I also would like to credit those before Mr. Waukap that took the risks and the time to
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| − | document their work on discriminator taps.
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| − |
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| − | ==Copyright==
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| − | This work is protected under GNU. Which means, give credit. You can add on to it. DO NOT restrict access or demand fees or donations to view it.
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| − |
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| − | ==Caution – Warning==
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| − | Here's the steps I took to tap the BC898T. I'm '''not responsible''' for anything that might go wrong if you try it. Installation steps including using a soldering iron or gun. It's '''hot''' and will '''burn you severely'''! '''Do not over heat the LND12 solder point.''' No implicit or suggested warranties applied.
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| − |
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| − | ==Installation==
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| − |
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| − | '''''Let's start with the BC898T case:'''''
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| − |
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| − | *Remove the 5 screws from the bottom case - 2 screws left and right of the case and one in the back
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| − | *Locate a place to drill the 1/4 hole for the phone connector (radio shack number 274-249).
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| − | *Put a cloth or something down inside the case to ketch the metal filings when the hole is drilled.
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| − | *Start with a pilot hole using a small drill bit.
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| − | *Use a 1/4" drill bit to make the hole the correct size.
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| − | *File any sharp edges
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| − | *Search for any metal filings in the case and remove them.
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| − |
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| − | '''''Installing wire to a resistor and phone connector connections:'''''
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| − |
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| − | *Remove the phone connector nut from the phone connector. You will be using the nut later.
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| − | *Find wire -- it can be solid core or stranded. In this example I choose wire used from a network cable.
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| − | *Cut two lengths of 8-10 inch wires.
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| − | *Strip ½ inch off the insulation on both sides of each wire.
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| − | *Examine the back of the radio shack package you will see numbers corresponding with the phone connectors.
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| − | *Connect a 10k ohm 1/4 watt resistor lead to the 1 terminal of the phone connector.
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| − | *Connect a wire to other resistor lead. Again, twist the wire and the resistor lead.
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| − | *Connect a wire to the 3 terminal of the phone connector. Twist the wire it will be easier to soldier.
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| − | *Solder the 1 terminal and the resistor lead
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| − | *Solder the wire to the resistor lead
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| − | *Solder the second wire to 3 terminal.
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| − | *Install the phone connector in the hole with the jack facing out.
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| − | *Install the phone connector nut firmly on the phone connector.
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| − |
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| − | '''''Installing wires on the main board and main board case mounting screw and final assembly:'''''
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| − |
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| − | *Warm up a soldering iron.
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| − | *Clean the soldering iron tip on a damp sponge.
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| − | *Locate the wire soldier to the resistor (1 terminal of the phone connector).
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| − | *Add a little solder to the wire tip. Just a little and no more. Place the end of the wire on LND12 soldier point.
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| − |
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| − | *The solder on the wire should combine with the LND12 solder point. Quickly remove the soldering tip.
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| − | *Wait a few seconds and gently tug on the wire connected to LND12. There should be no moment.
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| − | *Check the surrounding soldier points to make sure the wire is not in contact and there's no additional solder.
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| − | *Locate the main board case mount screw
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| − | *Turn the screw counter clockwise one full turn.
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| − | *Place the wire end of terminal 3 under the screw
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| − | *Firmly tighten the screw clockwise.
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| − | *Make any corrections necessary to the wires to avoid case or main board obstructions.
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| − | *Place the bottom half of the case back on the BC898T.
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| − | *Install the 5 screws to the case.
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| − |
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| − | ''This is the end of the installation portion of BC898T discriminator tap.''
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| − |
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| − | ==Post Production Notes==
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| − | *I used heat sink tubing to cover up the resistor and terminal solder connections.
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| − | *The 10k ohm resistor is to prevent harm to the main board if a short occurs.
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| − | *A capacitor is unnecessary. Most data slicers already have them.
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| − | *Ethernet network cable (CAT5-E) is 26 gauge wire.
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| − | *The phone connector 1 terminal is really close the BC898T case. I bent the terminal away from the case.
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| − |
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| − | ==Images==
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| − | [[Image:Bc898Tbackside.jpg]]
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| − | [[Image:Bc898Tbackside1a.jpg]]
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| − | [[Image:Bc898Ttestpoints.jpg]]
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| − | [[Image:Bc898Tbackside2.jpg]]
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| − | [[Image:Bc898Tback-mainboard.jpg]]
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| − | [[Image:Bc898Tback-mainboard2.jpg]]
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| − | [[Image:Unitrunker.jpg]]
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