TINY TRAK II mods for PHOENIX SX radios.
Gerry Dalton - W5MAY, Greg Jurrens - WD0ACD, Cave Wetterau - KA5MDY
1. Remove R9, C2, and R5 on the Tiny Trak II(TT2). Use CAUTION as the
traces on the TTII are very thin.
2. Install a jumper in R5 using a resistor lead.
3. Install one lead of a 3.3K Ohm 1/4W (ORG-ORG-RED) resistor into the
AUDIO IN side of the C2 part location. (See
4. Install a 2N2222 or equiv. NPN switching transistor as follows:
A. Emitter to the GROUND connection of R9
B. Collector to TAP connection of R9 going to IC1 Pin 10
C. Base to TOP of the 3.3K resistor mounted in STEP 3
(NOTE: IC1-10 is internally pulled up to +5V so no need for an additional
5. Remove the DE9S connector and add re-install pin for pin using 12"
A. Pin 2 - Serial Data FROM TT2
B. Pin 3 - Serial Data TO TT2
C. Pin 5 - Ground
(NOTE: This is a great opportunity to change to a DE9P Male connector and
swap Pins 2 and 3. This allows direct connect to GPS.
6. Connect the TT2 to the 12 Pin single row header located on the TOP
board of the Pheonix SX.
||Filtered Volume / Squelch HI
||Push to Talk
||AUDIO IN---RX MUTE (COR) Signal Active HI
||AUX Audio Input
||Ext Speaker AMP Control
||Int Speaker AMP Control
7. Locate the board in the Phoenix and affix with double-sided foam tape.
8. Rotate R6 on the TT2 FULLY counter clockwise.
WARNING! Before applying power to the radio, connect to a suitable antenna
or dummy load.
9. Apply Power.
A. D3 (RED) should light solid
B. D1 (YELLOW) and D2 (GREEN) will blink for about 1 second
C. D4 (RED) will blink NOTE: Tranmitter is keyed when D4 is lit.
10. Test the COR sense by rotating the Phoenix Squelch pot CCW until the
BUSY light on the front of the radio lights. D1 Should light. The SQL
pot is located on the bottom board of the Phoenix adjacent to the corner
of the RF shield CLOSEST to the front of the radio. Rotate SQL until BUSY
goes out. D1 should blink and then go out.
11. Program TT2 using the TT2config.exe software (http://www.byonics.com)
12. To set the output deviation, use TT2confige.exe SEND TONE and set to
about 3.5Khz by adjusting the MOD pot located on the top board far front
right corner of the Phoenix.
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