Required Test Equipment; Alignment Preparation & Precautions - Motorola PM1200 Basic Service Manual

5-2
5.2

Required Test Equipment

RF signal generator: calibrated output level at 100 MHz (0 dBμ =1.0 μV - terminated circuit)
• Signal Generator (HP 8657A)
• Modulation Analyzer (HP 8901B)
• Audio Analyzer (8903B)
• Flash ROM Adapter (HKLN4376_)
• Radio Alignment Programming Cable (HKLN 4379_)
• Regulated DC Power Supply: adjustable from 10 to 17 VDC, 30 A
• AF Dummy Load: 4Ω, 20 W (Test Box)
• IBM PC/compatible computer with AARKN4081_ programming cable.
• -30 dB Attenuation Pad (Aeroflex/Weinschel 49-30-34-LIM)
5.3 Alignment Preparation & Precautions
A dummy load and wattmeter must be connected to the main antenna jack in all procedures that call
for transmission, except where specified otherwise. Correct alignment is not possible with an
antenna. After completing one step, read the following step to determine whether the same test
equipment will be required. If not, remove the test equipment (except dummy load and wattmeter, if
connected) before proceeding.
Correct alignment requires that the ambient temperature be the same as that of the transceiver and
test equipment, and that this temperature be held constant between 20 and 30 °C (68 to 86 °F).
When the transceiver is brought into the shop from hot or cold air it should be allowed some time for
thermal equalization with the environment before alignment. If possible, alignments should be made
with oscillator shields and circuit boards firmly affixed in place. Also, the test equipment must be
thoroughly warmed up before beginning.
Before beginning, connect the transceiver and PC using the AARKN4081_ programming cable as
described in the EEPROM Programming chapter, and download the EEPROM data from the
transceiver to the computer.
Store this data in a disk file so that it can be saved and retrieved later. Using the table below,
program the channel, CTCSS, and DCS alignment settings for your transceiver version. Upload this
file to the transceiver.
NOTE: Signal levels in dB referred to in this procedure are based on 0 dBμ = 0.5 μV (terminated
circuit).
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C a u t i o n
October 26, 2007
Radio Alignment and Programming Procedures: Required Test Equipment
Do not connect this line to ground, and be certain that the
speaker has adequate capability to handle the audio output
from the radio.
6880309U09-A