Motorola HT 1000 ユーザーズマニュアル

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Compensation alignment balances the modulation sensitivity of the 
VCO and reference modulation (synthesizer low frequency port) lines. 
The compensation algorithm is critical to the operation of signalling 
schemes that have very low frequency components (e.g. DPL) and 
could result in distorted waveforms if improperly adjusted. 

NOTE: Disable all audio band filters on the service monitor.

NOTE: (Secure-Equipped Radios Only)

If a secure module is currently installed in the radio 
being aligned, refer to the appendix at the rear of this 
manual. Read section III, “Secure Alignment 
Procedure”, before performing the transmit deviation 
balance (compensation) procedure. 

1. Press F4 to select the TRANSMIT DEVIATION BALANCE softpot. 

The screen will indicate the transmit test frequencies to be used.

2. Begin with the lowest test frequency shown on the screen.

3. Set the Test Box (RTX4005B) meter selector switch to the “MX 

DISC” position, and inject an 80Hz tone at 100mVrms into the 
AC/DC MTR port. Keep the ac voltmeter in parallel to ensure the 
proper input signal level. 

4. Press F6 to key the radio, and measure deviation. Record this 

measurement. 

5. Change the input tone to 3 kHz, 100mVrms and use the UP/

DOWN arrow keys to adjust the deviation to within ±2% of the 
value recorded in step 4.

6. Change the input tone back to 80 Hz and measure the deviation.

7. Repeat steps 5 and 6 until the 3kHz tone deviation is within ±2% 

of the 80Hz tone deviation.

8. Press F6 to dekey the radio, and press F8 to program the softpot 

value. Press ENTER to move to next softpot value.

Power Level

Test Frequencies

Power Level

Test Frequencies

136 - 174MHz

177.975MHz

450 - 512MHz

512 - 520MHz

5.2 - 5.4 

4.2 - 4.4

4.2 - 4.4

3.2 - 3.4

1.2 - 1.4

1.2 - 1.4

1.2 - 1.4

1.2 - 1.4

Power Level

All Test Frequencies

Power Level

All Test Frequencies

3.2 - 3.4

2.4 - 2.6