Yaesu FTM-7250DR, Техническое дополнение

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FTM-7250DR/DE Technical Supplement
Alignment
ALIGNMENT-2
Alignment Preparation & Precautions
A 100-W RF dummy load and in-line wattmeter
must be connected to the main antenna jack in all
procedures that call for transmission; alignment
is not possible with an antenna. After complet-
ing 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 the transceiver and test equipment be
maintained at a constant ambient temperature be-
tween 68 °F ~ 86 °F (20 °C ~ 30 °C). When the trans-
ceiver 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 affixed in place. Also, the
test equipment must be thoroughly warmed up be-
fore beginning.
Note:
Signal levels in dB referred to in the alignment
procedure are based on 0 dBμ=0.5 μV (closed circuit).
Test Setup
Set up the test equipment as shown below for
transceiver alignment. Maintain the supply voltage
at 13.8V DC for all steps.
Internal System Alignment Routine
This uses a programmed routine in the transceiver
which simplifies many previously complex discrete
component settings and adjustments with digital
-
ly-controlled settings via front panel buttons and
LCD indications.
Programming the alignment password
1. Set the transceiver to the Analog-mode.
2. Press and hold in the [
MHz
(
SETUP
) ] key for
one second, then rotate the DIAL knob to select
" OPEN MSG 28 ".
3. Press the [ MHz
(
SETUP
) ] key, then rotate the
DIAL knob to select "MESSAGE".
4. Press the [ V/M
(
MW
) ] key momentarily to enable
programming of the opening message. You will
notice the first character entry’s location blink
-
ing.
5. Rotate the DIAL knob to select the "A", then
press the [ V/M
(
MW
) ] key momentarily to save
the "A" and move to the next character.
6. Repeat the previous step to complete the align-
ment password "AH075M".
7. When you have completed the password, press
and hold the [ MHz
(
SETUP
) ] key for one second
to save the settings and exit to normal operation.
MIC Jack Test Equipment Setup
MIC SW2
MIC SW1
GND +8V
MIC INPUT
PTT/CLONE
FTM-7250DR/DE
Inline
Wattmeter
SINAD Meter Deviation Meter
Frequency
Counter
RF
Signal Generator
AF
Signal Generator
50-Ohm
Dummy Load
MIC
ANT
EXT SP
RF Sampling
Coupler
DC INPUT