RADIOBEACON TRANSMITTER
ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE
Page 5-8
15 September 2003
(y)
Verify speaker audio is available and can be
adjusted to the desired level, by adjusting
VOLUME
potentiometer R1. Set
VOLUME
potentiometer R1 for a comfortable level.
(z)
Set
KEYING
switch S1 to
ON
.
(aa) Modulation envelope shall be keyed on and off
by the pre-programmed identification code.
Verify identification code is correct and code
frames are repeated every 5 to 16 seconds
(typically 8 seconds), by listening to speaker
audio.
(ab) Set
KEYING
switch S1 to
OFF
.
(ac) Set
VOLUME
potentiometer R1 fully counter
clockwise (turned off).
5.3.7
IDENTIFICATION/STANDBY
CODES
: Check the assigned station identification
code and pre-programmed standby codes ('1' and '2'),
as follows:
5.3.7.1
Identification Code
: Check the assigned
identification code, as follows:
(a)
Verify requirements of paragraph 3.8.5 - Keyer
Pre-Installation have been completed.
(b)
Set switches to position tabulated for
Calibration Setting
in table 4-1.
(c)
Verify 'intended' carrier level has been set as
described in paragraph 5.3.5.
(d)
Verify 'intended' modulation depth has been set
as described in paragraph 5.3.6.
(e)
Set
MOD
switch S4 to
ON
.
(f)
Set
KEYING
switch S5 to
ON
.
(g)
Adjust
VOLUME
potentiometer R1 for an
audible keyed beacon identification tone.
(h)
The deciphered coded portion of the
identification message shall be the identification
characters assigned to the transmitter.
(i)
Using a stopwatch, measure and record the time
from the start of the code of one frame to the
start of the code of the next frame.
(j)
The time recorded in step (i) shall be between 5
and 16 seconds (typically 8 seconds).
5.3.7.2
Standby '1' and Standby '2' Codes
:
Verify standby '1' and standby '2' code operation, as
follows:
(a)
Verify the requirements detailed in paragraph
5.3.7.1 have been met.
(b)
Set switches to positions tabulated for
Calibration Setting
in table 4-1.
(c)
Verify 'intended' RF carrier level has been set
as described in paragraph 5.3.5.
(d)
Verify 'intended' modulation depth has been set
as described in paragraph 5.3.6.
(e)
Set
MOD
switch S4 to
ON
.
(f)
Set
KEYING
switch S5 to
ON
.
(g)
Adjust
VOLUME
potentiometer R1 clockwise to
obtain an audible keyed beacon identification
tone.
(h)
Connect a jumper between A11TB1-21 and
ground.
(i)
Deciphered identification code shall contain the
assigned standby '1' variation.
(j)
Remove the ground from A11TB1-21.
(k)
Connect a jumper between A11TB1-3 and
ground.
(l)
Deciphered identification code shall contain the
assigned standby '2' variation.
(m) Remove the ground from A11TB1-3.
