TINY-2/MICRO-2 Technical Ref., 2. Ed 1989
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ADJUSTMENTS
Jumper Functions
The following table lists the function of each jumper on the TINY-2/MICRO-2 PC board. The nor-
mal (Standard jumper setting) positions for each are shown.
JP B : Lithium Battery
• ON (normal)
Lithium battery connected
• OFF
Lithium battery disconnected
JP D: NET/ROM + RFDCD
• N (normal)
NET/ROM input to DCDB
• RF
RF Squelch to DCDB
JP L: Digital Loopback
• N (normal)
Normal Modem Operation
• L
Digital loopback mode
JP RA: Audio Input Impedance
• ON (normal)
Speaker audio input
• OFF
High impedance audio input
JP Aux: Auxiliaryl/O
• Auxiliary I/O lines for MICROPOWER-2 with printer option
JP 8: Power Connection
• Auxiliary connection point for 12 V and gnd for accessories
Trimpot/Varicap Adjustments
Most of the following adjustments must be performed with the TINY 2/MICRO-2 removed from its
cabinet. Remove the packet controller from its cabinet by removing both front and rear end plates
and plastic bezels. Use caution not to damage the grounding straps attached to some of the end
plate screws.
• C17 CPU oscillator frequency
• R9
Modem bias level
• R12 Transmit output level
• R26 Modem carrier detect level
Baud Rate Setting
To set the baud rate on the packet controller, remove the TINY-2/MICRO-2 from its cabinet. There
are two sets of jumper headers [DIP switches] along the front edge of the circuit board with labels
of 3, 12, 24, 48, 96, and 19.2 for both TERMINAL and RADIO. These numbers correspond to 300,
1200, 2400, 4800, 9600, or 19,200 baud rates. Place the jumper on the two pins [turn the section
of the DIP switch ON] for the desired rate for both the computer and radio.
WARNING: Place one and only one jumper for the computer side, and only one on the radio side.
[Only one switch on the MICROPOWER-2 should be ON per section.
