1. NAT NPX138N VHF-FM Radio Part 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

2. This is the Advanced Training for use of the NPX-138 from Northern Airborne Technology
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
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
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Remember, this means you may press any key to continue

3. 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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4. One makes display selections by means of 4 toggle switches.
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, let’s 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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5. We now see the normal operating screen
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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6. X X X “And how, exactly, do I do that?”, you ask.
Review X X X
“And how, exactly, do I do that?”, you ask.
The EDIT switch is normally centered so that important settings don’t 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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7. 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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8. 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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9. 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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10. The key is knowing what it is you want or need
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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11. And we know we can execute the change by toggling the SELECT switch.
Setting Options
“SELECT”
“NEXT”
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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12. 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 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
The first variable which comes up is the Simplex/Duplex selection
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
One usually thinks of Simplex operation as direct, radio-to-radio contact, while Duplex is most often associated with repeater use
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13. Setting Options
The choices for the TONES setting are: ON, OFF, or TX ONLY. Leave “ON” for most general use
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
IF you need to hear a channel without your receiver tone filter on, “TX ONLY” does this. Don’t ever set to “TONES=OFF”. This cuts TX tones as well & you’ll forget, leaving it unusable for future air crews.
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14. The next changeable option is the TONE DISPlay.
Setting Options
The TONE DISPlay mode determines how that tone is labeled, for programming or reference purposes
The next changeable option is the TONE DISPlay.
In order to explain it’s 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 you’re now in the RX Display mode
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15. Setting Options
We refer to tone types in both simplex and repeater service by their frequency Hz, Hz, etc
This will become important if you should need to install other users’ channels in the field
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16. 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 we’ll 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
Let’s go back to the STep SELECTion we just left, showing the TONE DISP option and continue from there…...
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17. 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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18. EDIT Switch = <Centered>
Setting Options
Verify that you left :
Consider leaving all settings as show above:
We didn’t go through all selections possible within each variable option category
Most people won’t need to change any of these aforementioned selections, but it’s good to know how to do so in the field or on a mission
Once all of the STepped variables have been set, return the EDIT switch to the center position.
DISPlay Switch = ID
POWER = HI
SCAN Switch = Normal
Channel = Air to Ground
or as directed by your local command
Guard1/Guard2 = G1
or as directed by local command
EDIT Switch = <Centered>
TONES = ON
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19. Advanced User Training
OK, let’s 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 it’s in use, so you can hear if there’s traffic of interest to you
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20. Advanced User TrainingSC
The display, in ID DISPlay mode, will show “SC“ to the right of the Channel Name if it’s on the Scan List
If you choose to use the SCAN feature, first put your radio on the primary Channel you’re going to be working
Then, move the SCAN/NORM switch upwards and the radio will begin scanning channels
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21. Advanced User TrainingSC
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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22. Advanced User TrainingSC PI
In addition to being on the normal Scan list , certain channels can be designated as Priority channels
You’ll 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 you’re scanning, the radio will go to the priority channel
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23. Advanced User TrainingSC 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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24. Advanced User TrainingSC PI 3 2 1
“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)
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
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?
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25. 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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26. Please take a 15 Minute recess before continuing with this program
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.