Motorola Portable Radio Ep450 Basic Hkln4215a Manual

December 3, 2003HKLN4215A
5-2Radio Alignment Procedures: Radio Tuning Setup
5.3 Radio Tuning Setup
A Windows 98/NT4/2000/ME/XP PC (personal computer) and Global Tuner are required to tune the 
radio. To perform the tuning procedures, the radio must be connected to the PC, RIB (Radio Interface 
Box) and Universal Test Set as shown in Figure 5-2 below. Refer to online help files for the tuning 
procedures.
Figure 5-2.  Radio Tuning Setup
Service Monitor or 
Counter
Wattmeter
Audio Generator
Sinad Meter
AC...

HKLN4215ADecember 3, 2003
Radio Alignment Procedures: Transmitter Alignment Options 5-3
5.3.1 Initial Test Equipment Control Settings
The initial test equipment control settings are listed in Table 5-1. 
5.4 Transmitter Alignment Options
5.4.1 Reference Oscillator Warp
This is an important operation which affects all deviation values such as DTMF, MDC-1200 Signaling 
etc. The frequency will drift if not warped properly. Perform this operation prior to all other transmit 
tuning operations in order to...

December 3, 2003HKLN4215A
5-4Radio Alignment Procedures: Transmitter Alignment Options
1.Under Tx Align menu, select Reference Oscillator Warp (Figure 5-3).
2.There is only 1 frequency point shown which is always the last non-0 transmit frequency point, 
which will normally be F7. 
3.Click on the slider thumb and press PTT Toggle to key up the radio at the corresponding fre-
quency point. 
4.Monitor the transmit frequency. 
5.Adjust the slider, spin or edit control (press ENTER to confirm selection/send...

HKLN4215ADecember 3, 2003
Radio Alignment Procedures: Transmitter Alignment Options 5-5
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 Private-Line) and could result in 
distorted waveforms if improperly adjusted. To perform Modulation Balance tuning, follow the 
following steps. 
1.Under the...

December 3, 2003HKLN4215A
5-6Radio Alignment Procedures: Transmitter Alignment Options
5.4.3.1  To Perform Transmit High Power Tuning, do the following:
1.Under the Tx Align menu, select Transmit Power, then select High (Figure 5-5).
2.Press PTT Toggle. This will key the radio up at 1st test frequency (F1).   
3.Adjust the high power level to be as defined by Table 5-3. Move the slider/spin control or keying in 
values in the edit control (press ENTER to confirm your selection after typing in the softpot...

HKLN4215ADecember 3, 2003
Radio Alignment Procedures: Transmitter Alignment Options 5-7
5.4.4 VCO Attenuation
5.4.4.1  VCO Attenuation 25 kHz
1.Under the Tx Align menu, select VCO Attenuation 25 kHz (Figure 5-6).   
2.Begin with the lowest frequency. Select the thumb of the slider at the lowest frequency point and 
then press the PTT Toggle button to key up the radio at the corresponding frequency point. The 
spin control can also be toggled via its up/down arrow buttons. The softpot value can also be...

December 3, 2003HKLN4215A
5-8Radio Alignment Procedures: Transmitter Alignment Options
7.Program the softpot value by pressing the Program button.
8.Exit the VCO Attn. 25 kHz function.
5.4.4.2  VCO Attenuation 12.5 kHz
1.Under the Tx Align menu, select VCO Attenuation 12.5 kHz.
2.Press PTT Toggle to key up the radio at the last non-0 transmit frequency point (normally F7).
3.Inject 1 kHz at an appropriate level until 2.3 V rms is measured at the AC/DC METER (radio 
input) if using test box RLN4460....

HKLN4215ADecember 3, 2003
Radio Alignment Procedures: Transmitter Alignment Options 5-9
5.4.5 DTMF Deviation Tuning
This tuning option controls the Dual Tone Multi-Frequency deviation. Please note that Modulation 
Balancing and VCO Attenuation have to be performed prior to this tuning operation. Not doing so 
will result in the wrong deviation value being obtained while tuning the DTMF.
1.Under Tx Align, select DTMF Deviation (Figure 5-7).
2.Press PTT Toggle to key the radio. Monitor the deviation...

December 3, 2003HKLN4215A
5-10Radio Alignment Procedures: Receiver Tuning
5.4.6 MDC-1200 Deviation Tuning 
This tuning option controls the MDC-1200 Signaling deviation. Please note that Modulation Balancing 
and VCO Attenuation have to be performed prior to this tuning operation. Not doing so will result in 
the wrong deviation value being obtained while tuning this feature.
1.Under the Tx Align, select MDC-1200 Signaling (Figure 5-8).
2.Press PTT Toggle to key the radio up. Monitor the deviation...

HKLN4215ADecember 3, 2003
Radio Alignment Procedures: Receiver Tuning 5-11
5.5.1 Rated Volume Tuning
Perform the rated volume tuning procedure as follows:
1.Under the Rx Align menu, select Rated Volume (Figure 5-9).
2.Inject a -47 dBm RF signal modulated with 1 kHz tone at 3 KHz (for 25 kHz channel spacing). 
3.Adjust the softpot value by using the slider, keying in the edit box (press ENTER to confirm the 
selection or send a softpot value), or via the spin controls. Repeat this until 500 mW (3.24 V)...