13-6 MTR3000 Programming and Tuning: Tuning Setup (Wireline)
5. Set the Communication Analyzer to output a -47 dBm RF signal modulated with a 1 kHz tone
at 60% of full deviation on the tuning frequency. The tuning frequency is the value displayed
on the Tuner GUI under the heading of “Frequency Points”.
6. Adjust the softpot value until the desired receive audio level is achieved (-30 dBm to +7 dBm)
across line two of the J6 Wireline backplane connector terminals.
7. Click “Write” to save the new tuned softpot value into the radio’s codeplug.
13.5.2 Wireline Rx Equalization – 2800 Hz Tuning
The Rx Equalization feature allows the frequency response adjustment of the Rx Audio relative to a
specified rated system deviation, to compensate (equalize) for the response of the wireline backhaul
network itself. This section outlines the procedure for high frequency adjustment. Perform this
procedure only after setting the Wireline Receive Level. Refer to Section 13.5.1 on page 13-5.
The Rx Equalizer is adjusted relative to the response at 1 kHz. Note the 1 kHz response observed
when performing the tuning procedure for Wireline Receive Level. Equalizer adjustments are
approximate. Typical adjustments range from 0 dB to approximately +6 dB.
Note
The Tuner aligns this parameter in a 12.5 kHz channel spacing, so 60% is 1.5 kHz of
deviation. If the CPS is set for 25 kHz operation, the base station/repeater will automatically
scale the deviation by a factor of two when it is outside the Tuner environment.
Note
Programmed TPL and DPL squelch requirements are automatically disabled for the tuning
frequency while in the Tuner environment.
Note
It is imperative that the load the Wireline board is driving, matches that of the Wireline
board’s source impedance setting noted in the Tuner environment. Optimally, it is
recommended to use the actual load which is used during normal operation of the radio.
Line 2
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