DEWG CAP

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NAT NPX138N VHF-FM RadioPart II
Advanced User Training on the use of Scanning,
Priority, and Direct Frequency / Channel Editing
DEWG CAP 9/30/00
DAFB Air Mobility Command Museum Dover, Delaware
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This is the Advanced Training for use of the
NPX-138 from Northern Airborne Technology

• It is assumed for the purposes of this advanced
  training that the operator/student has at least
  some experience with frequency agile radios
• Examples of such are aviation band comm radios
  or certain VHF-FM applications

• Specific assumptions are made that the student
  understands the purpose of certain VHF-FM
  specific matters such as CTCSS tones, and is
  comfortable with prior instruction on general use
  as covered under Part I of this user training
  series

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Remember, this means you may press any key to
continue
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Proceed further if you desire information on
Channel Scanning, Priority Scanning, and
in-the-field frequency entry.
Do so only if you feel entirely confident with
the preceding material under Part I, the Basic
NPX-138N User Training.
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Review
One makes display selections by means of 4 toggle
switches.
Many radios will arrive with the default screen
shown here. Your radio can be re-programmed to
come on and go directly to the channel position
of your choice. For now, lets assume this is
what you see.
Most references to adjustments will be with
respect to one or more of these switches.
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Review
NEXT

• IF your radio does power up with this screen,
  simply move the NEXT Brightness toggle to the
  left or right

• We now see the normal operating screen

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Review
X
X
X
And how, exactly, do I do that?, you
ask.

• The EDIT switch is normally centered so that
  important settings dont get messed up

• You can, however, make corrections to TONE,
  POWER, SIMPLEX/DUPLEX, SCAN PRIORITY choices
  by this means

• You can, however, make corrections to TONE,
  POWER, SIMPLEX/DUPLEX, SCAN PRIORITY choices
  by this means

• You can, however, make corrections to TONE,
  POWER, SIMPLEX/DUPLEX, SCAN PRIORITY choices
  by this means

• You can, however, make corrections to TONE,
  POWER, SIMPLEX/DUPLEX, SCAN PRIORITY choices
  by this means

• You can, however, make corrections to TONE,
  POWER, SIMPLEX/DUPLEX, SCAN PRIORITY choices
  by this means

• You can, however, make corrections to TONE,
  POWER, SIMPLEX/DUPLEX, SCAN PRIORITY choices
  by this means

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Setting Options

• The important mode selections are STEPPED
  through, one at a time, by moving the EDIT switch
  to the right -- to the STep position

• The important mode selections are STEPPED
  through, one at a time, by moving the EDIT switch
  to the right -- to the STep position

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Setting Options

• The important selections are STEPPED through,
  one at a time, by moving the EDIT switch to the
  right -- to the STep position

• The EDIT switch in this position changes the
  mode of these other two switches to NEXT and
  SELECT, as labeled below them

• The EDIT switch in this position changes the
  mode of these other two switches to NEXT and
  SELECT, as labeled below them

• The EDIT switch in this position changes the
  mode of these other two switches to NEXT and
  SELECT, as labeled below them

• The EDIT switch in this position changes the
  mode of these other two switches to NEXT and
  SELECT, as labeled below them

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Setting Options

• Toggling the switch labeled NEXT takes you
  through the different modes or settings which can
  be adjusted, such as Power, Tones, Scan, etc
• These settings are global - They affect all
  channels, not just the one displayed at the time

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Setting Options

• The SELECT toggle makes the desired change, such
  as (selection) On, (selection) Off, or setting
  High or Low, etc
• The key is knowing what it is you want or need

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Setting Options
NEXT
SELECT

• So we know now that we can change various
  parameters by running thru them one at a time
  with the NEXT switch

• So we know now that we can change various
  parameters by running thru them one at a time
  with the NEXT switch

• And we know we can execute the change by toggling
  the SELECT switch.

• And we know we can execute the change by toggling
  the SELECT switch.

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Setting Options

• The Transmit mode should be left in DUPLEX, so
  that repeater channels will work. Duplex
  channels use one frequency for transmit and
  another for receive

• The first variable which comes up is the
  Simplex/Duplex selection

• The next variable in this sequence is the POWER
  OUTPUT with a choice of HI, which is 10 Watts of
  power (max allowed in CAP air service), or
  LO, which is 1 Watt

• One usually thinks of Simplex operation as
  direct, radio-to-radio contact, while Duplex is
  most often associated with repeater use

• Channels meant to be Simplex , such as 1 thru
  4, have been programmed with TX and RX the
  same so they will act as simplex
  channels just fine

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Setting Options

• The TONES selection is the next variable
• You recall from ROA training that a channel is
  comprised of 1) a radio frequency, and, 2) a
  sub-audible note, or tone, which rides underneath
  the voice audio and opens up other radios
  receivers

• The choices for the TONES setting are ON, OFF,
  or TX ONLY. Leave ON for most general use

• IF you need to hear a channel without your
  receiver tone filter on, TX ONLY does this.
  Dont ever set to TONESOFF. This cuts TX tones
  as well youll forget, leaving it unusable for
  future air crews.

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Setting Options

• The next changeable option is the TONE DISPlay.

• The TONE DISPlay mode determines how that tone
  is labeled, for programming or reference
  purposes

• In order to explain its significance, take a
  look at the main screen again, in this DISPlay
  mode

• Choices are the audio frequency itself, such as
  100.0, or the EIA such as 12, or other
  nomenclatures used by the Motorola or
  Wulfsberg companies

• Assume youre now in the RX Display mode

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Setting Options

• We refer to tone types in both simplex and
  repeater service by their frequency - 156.7 Hz,
  203.5 Hz, etc

• This will become important if you should need to
  install other users channels in the field

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Setting Options

• The next selectable options are the SCAN bank
  designator and the PRIORITY selector
• These two functions and their set-up are
  related, so well cover them together in just
  a moment

• So, TONE DISPlay is simply a choice of ways to
  refer to the CTCSS tones you may need to enter in
  the field
• Lets go back to the STep SELECTion we just
  left, showing the TONE DISP option and continue
  from there...

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Setting Options

• Another selection along in the Step process lets
  you choose the channel you see when you POWER-UP
  the radio

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Setting Options
Once all of the STepped variables have been set,
return the EDIT switch to the center position.
Consider leaving all settings as show above

Verify that you left

• We didnt go through all selections possible
  within each variable option category
• Most people wont need to change any of these
  aforementioned selections, but its good to know
  how to do so in the field or on a
  mission

POWER HI
DISPlay Switch ID

Channel Air to Ground or as directed by
your local command
SCAN Switch Normal
Guard1/Guard2 G1 or as directed by local
command
TONES ON
EDIT Switch ltCenteredgt
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Advanced User Training

• OK, lets cover Channel Scan and
  Priority
• Scanning is the process of allowing the radio to
  listen to many channels in a repeating sequence
• The receiver stops on a channel if its in use,
  so you can hear if theres traffic of interest to
  you

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Advanced User Training
SC

• The display, in ID DISPlay mode, will show SC
  to the right of the Channel Name if its on the
  Scan List

• If you choose to use the SCAN feature, first
  put your radio on the primary Channel youre
  going to be working

• Then, move the SCAN/NORM switch upwards and the
  radio will begin scanning channels

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Advanced User Training
SC

• If the home channel becomes busy, the
  receiver will revert back there for you

• If a channel becomes a nuisance, toggle the
  CHANnel switch to - to make the radio ignore
  that channel

• This temporary bypass request is reset once you
  leave the SCAN mode, or if you power off the
  radio

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Advanced User Training
SC
PI

• In addition to being on the normal Scan list ,
  certain channels can be designated as Priority
  channels

• Youll see a PI or P2 to the right of the
  Channel Name if this channel was programmed as
  a Priority channel

• If a Priority channel becomes active while
  youre scanning, the radio will go to the
  priority channel

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Advanced User Training
SC
PI

• This is NOT the same as a guard channel. A
  scanned channel is monitored in sequence A
  Guard channel is monitored simultaneously
  regardless of other activities

• This is NOT the same as a guard channel. A
  scanned channel is monitored in sequence A
  Guard channel is monitored simultaneously
  regardless of other activities

• This is NOT the same as a guard channel. A
  scanned channel is monitored in sequence A
  Guard channel is monitored simultaneously
  regardless of other activities

• A channel is made a Priority channel at the time
  of programming This can be changed in the field
  by persons who know how to edit or enter channels
  in the field

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Advanced User Training
SC
PI
1
2
3
NEXT

• We now know that there is a batch of channels
  listed in a main Scan group, and that there are
  certain ones among this group which are Priority
  selections

1. Move the EDIT/STep switch to the right
2. Use the NEXT toggle to find the SCAN
options (Note that at present, only the normal
scan list is chosen)

• How do we decide if we want to simply scan those
  in the Scan group batch, or if we want to be
  interrupted by Priority channels as well?

3. SELECT whether to scan just the LIST of
scan-channels, or if you want the scan-LIST and
the PRIority feature to be engaged
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Advanced User Training
SC PI
SC PI
SC PI
SC PI
SC PI

• The use of scanning is a subject best covered
  in detail under self-study in front of the radio
  with the manual

• Please avail yourself of this time-honored
  training technique

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BREAK
Please take a 15 Minute recess before
continuing with this program
Please load the file NPX138 2of2 Advanced
Training.ppt for the rest of this training
session.
Please load the file NPX138 2of2 Advanced
Training.ppt for the rest of this training
session.
Please load the file NPX138 2of2 Advanced
Training.ppt for the rest of this training
session.
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