Tandy 102 Service Manual page 37

Modem Transmitting Level Adjustment
1. Set the DIR/ACP switch to the DIR position.
2. Connect a 600-ohm dummy load between pin-3 (RXMD) and pin-7 (TXMD) of the MODEM
connector (CN4).
3. Connect an AC voltmeter across the above dummy load.
4. Set up the Tandy 102 in BASIC mode and enter the following command to generates the carrier
signal:
OUT 178 ,47 [ENTER]
OUT 168 ,02 [ENTER]
5. Adjust VR2 so as to read -14 to -17 dBm on the AC voltmeter for both ANS and ORIG modes.
600n
0
C
o ooooo0000
ooooo000000
0 0 0000 000
O
0
o
0
VR2
0
Figure 4-20. MODEM Adjustment