Page 4-6
Vector-LP Radio Beacon Transmitter Technical Instruction Manual
Issue 1.1
Section 4 Testing and Adjustment
Ensure that antenna current feedback
is
OFF
(disabled, see 3.6.15) before
proceeding.
(b) Select the exciter (A or B) that will be
operational for the next year as the
Main Side (see 3.6.4) and note the
forward power level on the screen.
NOTE
For clarity of description this procedure
uses factory default values for changeover
thresholds (3 dB for low RF power, 60% for
low modulation) and timeout values (20
seconds). These thresholds and values are
user adjustable.
(c) From the diagnostic display, select
Main Menu / Settings / Monitor
Settings. The timeout counter should
read 20 sec. (default value; can be
user adjusted).
(d) Decrease the RF power until the
counter begins to count down. The RF
power should be 3 dB (default value,
can be user adjusted) below the
power noted in step (b).
(e) A changeover should occur after the
timeout counter value in step (c). If
not, adjust the RF power to the
original level noted in step (b). Select
Main Menu/Settings/Monitor Settings/
Power Thresholds. Press
Continue
to
proceed. Press
Compute New
Thresholds
to establish new power
thresholds. If a modification is made,
a screen appears which prompts you
to save changes to EEPROM. Select
Yes
. Return to step (d).
(f) Increase the RF power to the desired
power level noted in step (b). Press
Reset
in the
Status
menu. The
transmitter should switch back to the
main side and the
Changeover
LED
should no longer be on.
(g) Select Main Menu/Peripherals/Keyer
Settings/Audio Levels.
(h) Note the modulation level. Decrease
the Keying Pot level (see 3.6.13.1).
Power should be inhibited when 60
r
2% modulation is reached. A
changeover should occur 20 seconds
later. Power should still be inhibited
on the standby side. If not, continue to
decrease the Keying Pot until power is
inhibited on the standby side (this
should also occur at 60
r
2%
modulation). Press
Cancel
. Press
Reset
in the
Status
menu. The
transmitter should switch back to the
main side and the
Changeover
LED
should no longer be on.
(i) Select
Main
Menu/Settings/Monitor
Settings/Mod % Thresholds. Press
Continue
to proceed.
The third row in the Side A column
(63.8 in the example above) should
read 60
r
2%. The third row in the
Side B column (also 63.8 in the
example above) should read 60
r
2%.
Mod % Thresholds
Minimum Allowable Tone Modulation Depth
:
...PTT Inactive:
164
153
...PTT Active:
1023
1023
63.8
63.8
35.4
35.4
Compute New
Thresholds
Rf Mon: CURR
Toggle
Back
12:43:16 Power: 0W Side A Bypass
Mod % Thresholds
Minimum Allowable Tone Modulation Depth
:
...PTT Inactive:
164
153
...PTT Active:
1023
1023
63.8
63.8
35.4
35.4
Compute New
Thresholds
Rf Mon: CURR
Toggle
Back
12:43:16 Power: 0W Side A Bypass
Mod % Thresholds
Minimum Allowable Tone Modulation Depth
:
...PTT Inactive:
164
153
...PTT Active:
1023
1023
63.8
63.8
35.4
35.4
Compute New
Thresholds
Rf Mon: CURR
Toggle
Back
12:43:16 Power: 0W Side A Bypass
Side A
Side B
