Standard Horizon HX400, Service Manual

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HX400 Service Manual
Alignment
Alignment - 2
Alignment Preparation & Precautions
A 50-ohm RF load and in-line wattmeter must be
connected to the main antenna jack in all proce -
dures that call for transmission, except where spec -
ified otherwise. Correct alignment is not possible
with an antenna. After completing one step, read
the next step to see if the same test equipment is
required. If not, remove the test equipment (except
dummy load and wattmeter, if connected) before
proceeding.
Correct alignment requires that the ambient tem -
perature be the same as that of the transceiver and
test equipment, and that this temperature be held
constant between 68 ~ 86 °F (20 ~ 30 °C) . When the
transceiver is brought into the shop from hot or
cold air, it should be allowed some time to come to
room temperature before alignment.
Whenever possible, alignments should be made
with oscillator shields and circuit boards firmly af -
fixed in place.
Also, the test equipment must be thoroughly
warmed up before beginning.
Set up the test equipment as shown below for
transceiver alignment, apply 7.4 VDC power to the
transceiver.
Notes: signal levels in dB referred to in alignment
are based on EMF (0 dBμ = 1.0 μV).
Test Equipment Setup
Entering the Alignment mode
Press and hold in the [ H/L ], [
p
], and [ CLR(WX) ]
keys while turn the transceiver on to enter the
alignment mode.