Tuning Instructions

Model AF160 (non-DIP switch units)

      STEP BY STEP GUIDE: 

1.      Remove "W3" jumper (AFC disabled).

2.      Connect accurate volt meter to test point "W2" (tuning voltage).

3.      Consult Table 1 below (Frequency vs. Voltage at "W2") for your desired frequency.

4.      Tune "R104" to the proper voltage reading for your frequency

5.      This should be the desired station.

6.      Once the desired station has been reached, replace the AFC jumper "W3" to its                 "ON" position.  If the voltage on "W2" varies more than 0.1 volt, adjust "R104"                     again.

7.      To test accuracy of frequency setting -- unplug unit -- wait one minute -- repower.  A 20      second timer will be tripped -- the unit will stablize in approximately 30 seconds.

8.      To adjust frequency response -- use "W8 - W17" for best sound.

9.      Adjust "R71" for maximum output without clipping into the amplifier.

10.      Adjust "R72" to adjust 8 ohm output level.

        Note:  "L1, L2, & L3" have been set at the factory and no attempt should be made to adjust any inductors on this unit.  If you need assistance contact Tech Support.

List of Jumper Functions

•  W1                12 volt to antenna

•  W2                Test point for tuning voltage

•  W3                AFC On

•  W4                Bias shift of AFC control circuit (to be used by factory)

•  W8 - W17     Five band graphic equalizer for audio response.

Adjustment Points

•  R71               Line audio level control to amplifier

•  R72               8 ohm amplified audio level control

•  R77               Carrier squelch control

•  R84               Audio squelch control

•  R104             Frequency setting

Table 1:  Frequency vs. Voltage at W2

•   88.1        1.55                    89.1          1.70                  90.1          1.87

•   91.1        2.04                    92.1          2.24                  93.1          2.44

•   94.1        2.64                    95.1          2.86                  96.1          3.08

•   97.1        3.37                    98.1          3.66                  99.1          3.94

• 100.1        4.24                  101.1          4.57                102.1          4.94

• 103.1        5.30                  104.1          5.70                105.1          6.10

• 106.1        6.53                  107.1          7.07                108.1          7.50

• 109.1        8.03

      Note:  Voltages are +/- 0.05V

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Last Updated Friday, March 07, 2003