Radio Alignment Procedures: Transmitter Alignment Options | |
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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 signaling schemes that have very low frequency components (Digital
1.Under the Tx Align menu, select Mod Balance Attn (Figure
2.Begin with the lowest frequency (i.e. the first frequency point from the top). Pressing PTT Toggle without selecting any slider control at the corresponding frequency point will key the radio up at the first frequency point.
3.Inject 80 Hz at an amplitude of 1.78 V.
4.Record the deviation obtained. Typical values should range from
5.Inject 3 kHz. Set the amplitude to 1.5 V.
6.Change the modulation balance attenuation setting until the Tx deviation is as recorded in step 4.
7.Inject 80 Hz at an amplitude of 1.78 V.
8.Check the deviation again. If the Tx deviation changes, record the reading and repeat steps
9.Press PTT Toggle to dekey the radio. Choose the next frequency, key up and repeat steps 3 to 8 until all seven tuning points are done.
10.Program the softpot value by pressing the Program button.
11.Exit the Modulation Balance Function.
5.4.3Transmit Power Tuning
Note: The maximum available power level given in the table below must not be exceeded. There are separate alignment procedures for High and Low power.
Note: When checking the RF power output of the radio with a test set, always use a pad of
at least 30 dB attached to the radio end of the RF cable. This will avoid an RF mismatch and ensure a stable RF reading that will not change with varying lengths of connecting cable
Figure 5-5. Transmit Power Window (High Power)
HKLN4215A | December 3, 2003 |
