THE MOTOROLA RLN4008B RADIO INTERFACE BOX (RIB)

The RLN4008B Parts List Reference Symbol Description CAPACITOR C1, C3, C4  10uF 25V   C2  1uF 50V   C5  220pF DIODE CR1, CR2, CR7 thru CR10 1N4001   CR3 thru CR6 Zener  7.5V , 1/2W   DS1 LED  red , low current JACK J1 Receptacle  Power   P2 25 Position  Male "D"   P4 15 Position  Male "D" TRANSISTOR Q1 thru Q3, Q5, Q7 NPN   2N3904   Q4, Q6 PNP   2N3906 RESISTOR R1, R3, R4, R7, R9, R10, 4k7   1/4W   R12, R13, R15, R16, R17 4k7   1/4W   R2, R8 20k   1/4W   R5 3k     1/4W   R6 1k5   1/4W   R11, R14 2k     1/4W   R18 3k9   1/4W SWITCH SW1 Toggle, SPST IC U001 78L05 Voltage Reg.   U002 ICL7660 Inverter   U003 CA3140E  OTHER BT1 Battery   9V HARDWARE PCB Mounting  7 mm Round Spacer  4 pcs   Screw , PCB to Spacer M3 x 4       4 pcs   Screw , Chassis to Spacer M3 x 6       4 pcs   Plastic Chassis  W75 x L103 ( min. inside dim.) A modification you may be interested in for the RIB. There have been reports of problems using the RIB on different computers. It looks like one of the problems might be a lack of negative voltage swing on the Busy out and RX (data out) lines back to the computer. You might want to try and change the value of R14 to 1.5k and R11 to 1K.     Date: 3-Sep-2005 Prepare by: Tony, E-Mail: HelpYou@Two-Meter.COM