The R7000 connection kit contains the following: 0.1 uf Capacitor 33K Resistor KBF-455R-20A Ceramic Filter 12" Shielded Cable Wire tie These Instructions The audio output from the R7000 will work as is when the radio is in the Wide Band FM mode. This mode is not desirable for most applications however since the signal must be strong and there can not be nearby transmissions. For narrow band FM be sure the switch on the back is set to FM(2) and the jumper inside (J8) is set to WIDE. A ceramic filter must also be changed and the DDI must be connected to an internal point as described in these instructions. Changing the -15 filter to a -20 filter: ----------------------------------------- 1. Remove top cover and unplug speaker. 2. Disconnect cables to allow removal of PCB near front of unit: - Unplug three cables near speaker plug. - Unplug cable on rear board that crosses this board. - Unplug single white plug on right side. - Unplug gray shielded cable on right over this board. - Unplug single wire on left side. - Unplug large cable on left. - One cable will remain connected to the PCB. 3. Remove six screws around the PCB. 4. Identify the filter to be removed. It will be nearest the front with a large E on it. The part is FI4 and the part number is CFW455E. The new part is a different color but is the same size with the same lead arrangement. 5. Desolder and remove old filter and replace it with the new one. R7100 UPDATE The R7100 schematic is very similar to the R7000 in the area of concern. Attached are the R7000 modification instructions. FI6 in the R7100 is the filter that will need to be changed. The connect point in the R7100 would be between R228 and R230. The R7100 does not have a spare jack in the rear as the R7000 does but an unused jack such as a AGC may be used by first diconnecting the wire on the jack. If you have any problems let me know. If you have any additional information that may help other R7100 users also let me know. PRO-200X MODIFICATION INSTRUCTIONS The following instructions are for the MFM unit. A more inexpensive modification may be made but it is more difficult to install. 1. Mount the MFM in the rear by drilling a hole for it. 2. Connect the red wire to +5V. This is found on 7805 voltage regulator on the pin closest to the rear of the unit. 3. Connect the brown wire to ground. This is the center pin of the 7805. 4. Connect the end of the resister at the end of the shielded cable to pin 3 of IC2. This IC has a 10420 on it. It is near the front of the unit in the center. Clip the resistor lead so it is as short as practical for soldering and positioning. AR-3000 MODIFICATION INSTRUCTIONS Disconnect all cables to the radio including the antenna. Turn the radio upside down, remove the four screws holding down the bottom cover and remove it. Place the radio such that the rear is closest to you. The MFM unit will mount just above the antenna jack. The red/brown wires will connect to the PC board above the RS-232 connector. The shielded cable will go under the large PC board and connect to a point under this board. Œ™A. Disconnect large PC board. 1. Write down the locations of the 5 shielded cables connected to the board near the front of the radio. Three may be color coded Red, Black and White. Two go to a metal coax connector. First be sure you will know where the cables should be connected then disconnect these five cables. 2. Remove the 6 screws around the perimeter of the board. B. Mount MFM. 1. There should be a hole in the metal frame near the rear of the radio above the antenna jack. If you hold the MFM unit solder side up in this area you should see how the unit can be mounted with the jack on the MFM extending through the hole. 2. Since the hole is in the metal frame but not the plastic plate you must cut the hole through the plastic plate. Use an exacto knife or drill. 3. Mount the MFM solder side up. The components on the card should face the antenna jack. The card will be parallel to the bottom cover. C. Connect power wires. 1. Solder the brown wire to the ground connection to the right of the RS-232 connector. 2. Solder the red wire to the +5V available near pin 16 of the MAX232 chip. Follow the trace from pin 16 of this chip to the left to the larger solder point. Solder the red wire here. D. Connect the shielded cable. 1. Turn the large PC board upside down. You may need to push some of the cabling around a little. The PC board will not be removed since several cables are still connected but it can be turned entirely upside down. 2. Identify the small IC chip with a 3357 on it. Orient the radio such that chip is farthest from you. 3. Pin 3 of the 3357 has a trace that goes under a surface mount part to a series of solder points. The connect point is anywhere in this group of connected solder points. 4. At the end of the shielded cable is a resister under the shrink tube. Cut the resister lead as short as you can while still long enough to solder to. Around 0.25" is good. 5. Solder the clipped end of the resistor to the connect point. The cable should move to the right off the board.Ô€€€h)€€€€€€€€€0*0*0*°°€€ÔŒ™6. Assuming the 3357 is near the top of the board the shielded cable should move to the right across the board. Make sure the bare resistor wire does not short to any point other than the connect point. The shielded cable should wrap around the board to the right and may be secured to nearby cables with the wire tie. E. Assemble radio. 1. Flip PC board back, Insert 6 screws, Attach 5 shielded cables. 2. Inspect MFM and cables to ensure it is secure and not shorting against anything. 3. Restore bottom cover with 4 screws. AR-2500 MODIFICATION INSTRUCTIONS This Kit includes the following: Audio Jack assembly with cable KBF-455R-20A Ceramic Filter Wire tie These Instructions Modifications to the AR-2500 may not be necessary. It appears that some radios require the ceramic filter to be replaced before it will operate properly with the DDI. Instructions to change the filter follow. To eliminate the effect of the volume control and to use the internal speaker you may also add a special jack for the DDI. Changing the filter: -------------------- 1. Remove bottom cover by removing four screws and disconnect speaker and computer jack cables. 2. Un-Screw four posts holding main PC board down. 3. Identify the filter to be removed. It will look much like the one you are inserting except that it is black. It is near the 7761 IC chip. 4. De-solder and remove old filter and replace it with the new one. 5. While you are under the PCB identify and remove the very small capacitor between pins 9 and 10 of the 7761. The capacitor is a very small surface mount chip. The cable you will install below contains a replacement (less restrictive) capacitor. 6. Re-assemble unit. Œ™ Connecting to the DDI: The speaker jack will work (DDI should be in the -Normal mode, no inversion of audio). The internal speaker will cut out and volume will have some effect on the data. To make an internal connection drill a hole in the rear. Between the power jack and the speaker jack is a good place. Mount the audio jack. Connect the other end of the shielded cable to pin 9 of the 7761 IC. This can be soldered on the component side of the PC board where the lead enters the IC. Connect the brown wire to ground. Ground may be found on top of the plate near the antenna. When using the internal connection the DDI & software should be in the INVERT mode. Set this with a -I command or with the DDI software use the ALT-M window. Note that the jack has a 4.7K resister and 0.1 uf resister in series with the center of the shielded cable. There is also a .0022 capacitor between the IC tap off point and ground. AR-2515 MODIFICATION INSTRUCTIONS Disconnect all cables to the radio including the antenna. Turn the radio upside down, remove the four screws holding down the bottom cover and remove it. The speaker cable can be unplugged. Remove the two screws and the top cover as well. Place the radio such that the rear is closest to you. The MFM unit will mount just above the antenna jack. A. Mount MFM. 1. There should be a hole in the metal frame near the rear of the radio above the antenna jack. If you hold the MFM unit solder side up in this area you should see how the unit can be mounted with the jack on the MFM extending through the hole. 2. Since the hole is in the metal frame but not the plastic plate you must cut the hole through the plastic plate. Use an exacto knife or drill. 3. Mount the MFM solder side up. The components on the card should face the antenna jack. The card will be parallel to the bottom cover. B. Connect power wires. Œ1. Solder the brown wire to a ground connection. There is a large solder joint in the center of the separating metal plate in the middle of the radio that will work well. 2. Solder the red wire to the +5V available on pin 13 of the MAX231 chip. This chip is behind the keyboard. C. Connect the shielded cable. 1. Feed the shielded cable so it is over the top PC board (when the radio sits as it does during operation). 2. Turn the radio upside right. Locate the 3357 chip near the right center edge (as the rear is toward you). 3. Solder the end of the cable to pin 3 of the 3357. Pin 3 is the third pin from the front of the radio on the inside. At the end of the shielded cable is a resister under the shrink tube. Cut the resister lead as short as you can while still long enough to solder to. Around 0.25" is good. With this connection the DDI software must not have the INVERT AUDIO in the ALT-M window selected. The serial connection to the radio is as follows: Radio 9 pin PC or 25 pin PC 3 2 3 2 3 2 7 5 7 The plug when looking at it from the back of the radio is numbered as follows: 8 7 6 5 4 3 2 1 16 15 14 13 12 11 10 9 BC-950/BC-760 MODIFICATION INSTRUCTIONS This Kit includes the following: Audio Jack 100K Resistor These Instructions Connecting to the DDI: A good audio signal is located off pin 10 of IC2 (the 3359). Connect to this point with a 100K resistor. Use a shielded cable to the supplied jack. Be sure to either mount the jack in the metal chassis or run a wire from the ground on the jack to a ground in the radio. Run a cable from the jack directly to the DDI. Ô€€€h)€€€€€€€€0*0*0*°°€€ÔŒ™If you ordered an audio cable with the DDI the cable sent will mate with the DDI on one end and the supplied jack on the other. Do not connect a speaker to the DDI. The volume control on the radio will have no effect on the DDI.