TNC2.7 U34 assemble as: PIN Component PIN 1 no Connection 16 2 0.022 uf 15 3 22.1k 1% 14 4 226.0k 1% 13 5 0.0047 uf 12 6 0.01 uf 11 7 100.0k 1% 10 8 510k 5% 9 * All Capacitors are MONOLITHICS U30 assemble as: PIN Component PIN 1 23.7k 1% 16 2 10.0k 1% 15 3 11.3k 1% 14 4 10.0k 1% 13 * NOTE BELOW 5 43.2k 1% 12 6 10.0k 1% 11 7 38.2k 1% 10 * NOTE BELOW 8 10.0k 1% 9 In clipping off the resistor leads DO NOT clip the 10 k resistor lead at PIN 4. clip all other lead but that one. Bend PIN 4's lead frm the 10 k resistor down the side of the header and without touching any other pins (5 & 6) solder the end of the pin 4 10 k resistor to PIN 7 at the 38.2 K resistor. Turn the header over and clip the PIN 4 off close to the header base. Install this into U30 and the above into U34. Calibrate as follows: CAL:1/1152 CAL:2/1024 CAL:3 use the same procedure as in the TAPR installion alinement instructions in the manual where the leds ALTERNATE in equal brightness to get an error count of 0 ... You will then be on the air... Tuning is EXTREMELY critical on the HF bands so be patient sometimes helps to set TRAC to $ffff anad monitor all frame activity and then turn trac off and procede to packet. Radio must be stable & tunable to 10HZ increments. Most digitally systhesized rigs today have 10 hrtz steps but dont display ot on the dial. ...... ENJOY JOHN