Term
| 239-1. What is automatic link establishment? |
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Definition
| A means of automatically establishing an HF link between two or more stations with minimum operator inputs. |
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Term
| 239-2. What are the two major differences between conventional HF and ALE HF communications? |
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Definition
(1) ALE lets you call one station in a ALE net selectively without disturbing the rest of the net.
(2) The ALE system automatically chooses the best frequency (from a preprogrammed list) for a call under the conditions at that time. |
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Term
| 239-3. How many alphanumeric characters are used in most ALE addresses? |
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Definition
| Most ALE addresses consist of three alphanumeric characters, even though addresses up to 15 characters long may be used. |
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Term
239-4. Match the ALE addresses in column B with the description it is associated with in column A. Items in column B may be used once.
Column A
Column B
_____ (1) Addresses of other stations on the net.
_____ (2) User programmed address into your system.
_____ (3) Addresses not preprogrammed into your listing.
_____ (4) Addresses those shares with other stations.
a. Self Address.
b. Net Address.
c. Other-station Address.
d. Floating Address. |
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Definition
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Term
| 239-5. What happens if a link attempt is not successful on the first channel selected, or if the channel is busy? |
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Definition
| If a link attempt is not successful on the first channel selected, or if the channel is busy, alternative channels are selected automatically. |
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Term
| 239-6. What is an individual call? |
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Definition
| The individual call (station-to-station call) is intended to establish a two-way communication link between two ALE stations on a single, automatically selected channel. |
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Term
| 239-7. Differentiate between a group call and a net call? |
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Definition
| Unlike net calls, which require prior coordination by a network manager, group calls let you contact a group of stations when you know only the self address and scan list. |
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Term
| 240-1. Define the term “sounding.” |
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Definition
| The process of transmitting a signal on a frequency used by other stations to determine that channel’s usability. |
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Term
| 240-2. State the purpose of link quality analysis. |
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Definition
| To determine a particular frequency’s signal quality |
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Term
| 240-3. What does sounding contain? |
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Definition
| They contain station identity information for use by other stations to “rank” this channel among all channels on the scan list. |
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Term
| 241-1. Describe an AN/PRC–150 Manpack radio? |
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Definition
| The AN/PRC–150(C) is an advanced HF radio which operates from 1.6 MHz to 29.9999 MHz using sky wave (USB, LSB, CW, AME) modulations with selectable low (1.0 watt), medium (5.0 watts), and high (20.0 watts) output power. The AN/PRC–150(C) also operates from 20.0000 MHz to 59.9999 MHz in FM with maximum power of 10.0 watts. Communications can take place with manpack, mobile, and fixed-site radio configurations. |
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Term
| 241-2. Where are all functions of the radio controlled from? |
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Definition
| All functions are controlled from the front panel and KDU, or via a remote control device. |
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Term
| 241-3. What does the ALE phone call features allow? |
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Definition
| The ALE phone call features allow the radio to call and link to an “HF Ground Station” capable of patching voice calls to a Public Service Telephone Network (PSTN) landline or similar communications network. |
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Term
| 241-4. What common transmission technique does the AN/PRC–150 use? |
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Definition
| It uses a common transmission security technique called frequency hopping. |
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Term
| 241-5. What type of antenna comes with AN/PRC–150 radio? |
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Definition
| The OE–505 manpack whip antenna kit provided with the radio is 3.1 meters long and consists of six collapsible sections. |
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Term
| 241-6. What is required to operate in medium-range communications along with the AN/PRC–150? |
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Definition
| The AN/PRC–150 along with an RF–5834H-PA power amplifier can increase power to a 400-watt capability. It operates in applications where medium-range communications are required. |
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Term
242-1. Match the assembly/subassembly in column B with the description it is associated with in column A. Items in column B may be used once.
Column A
Column B
_____ (1) Contains the receiver and exciter.
_____ (2) Radio’s man-machine interface.
_____ (3) Distributes DC power to other assemblies.
_____ (4) Supervises control functions.
_____ (5) Contains the power supply.
a. Chassis.
b. Lower Chassis.
c. Upper Chassis.
d. Rear Panel.
e. Keypad Display Unit. |
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Definition
(1) c.
(2) e.
(3) a.
(4) b.
(5) d. |
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Term
| 242-2. Where are the impedance matching circuits located? |
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Definition
| The signal then passes through an impedance matching circuit in A3A5 Antenna Coupler Assembly. |
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Term
| 242-3. Where do the received audio signal digital data signals exit? |
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Definition
| Via J1 AUDIO connector, or a digital data signal exits the radio via J3 DATA connector. |
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