Copyright 1993 Link Communications
AUDIO IN PRECAUTIONS, ADJUSTMENT:
The maximum audio the RLC-6 can accept without any clipping is 2.2V peak-peak input. The RLC-6 has
audio adjusting pots for 5 inputs; Main RX, Links 1, 2, 3 and the CW/Voice Audio input. The measurements needed
to adjust the audio levels are direct and require minimal equipment; an oscilloscope, true RMS AC voltmeter, or a
service monitor will serve this purpose. It is very important to adjust all of the audio inputs on the
RLC-6 to the same level for consistent output deviation. 5 test points are provided on the RLC-6 to
aid in the adjustment of the audio input signals. The test point connector is labeled JP1.
JP1 Pinout:
1 MAIN RECEIVER PORT 0
2 LINK RX 1 PORT 1
3 LINK RX 2 PORT 2
4 LINK RX 3 PORT 3
5 CW/VOICE INPUT
6 SYSTEM GROUND
Attach your measuring device to pin 1 of JP1. Present the Main Receiver with a known tone, about 1 Khz.
and adjust the input level pot (MIN) to 2V peak-peak (1.4V RMS), or a level that is not into clipping. Note that to
increase some of the levels, the pot must be turned counterclockwise. If no audio is seen at JP1,
then check and see if the Main RX COR is selected. If there is not a valid COR seen by the RLC-6,
there will not be audio present at JP1. Once the Main Receiver is adjusted, proceed to adjust the 3 Link
receivers in the same manner to the same level. It is very important in the adjusting of the audio input levels to keep
the levels matched between the 4 receivers. Any differences in the levels will result in instabilities in the output
deviations when operating the RLC-6. The final input adjustment is the TXIN level. This level is adjusted only after
all of the repeater setup is complete. This audio source is usually connected to the main transmitter audio bus. It is
never selected specifically by the software (in the EPROMs), and therefore would only be transmitted as part of the
mixed audio. We will cover this adjustment last.
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