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tnc2.7
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1990-09-02
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48 lines
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