Rhotheta RT-8556 Manuale utente

User Manual

Installation and Operating

Ramptester

for

RT-400, RT-500-M, RT-800

Radio Direction Finders

RT-8556 Ramptester User Manual

RHOTHETA Page 2 of 17 User Manual

Edited by:

RHOTHETA Elektronik GmbH

Kemmelpark

Dr.-Ingeborg-Haeckel-Str. 2

82418 Murnau

Germany

Tel.: +49 8841 4879 - 0

Fax: +49 8841 4879 - 15

Internet: www.rhotheta.de

E-Mail: email@rhotheta.de

-Issue: 2020/10/27 [Rev 1.00a]

-Document-ID: 12-9-1-0023-3-1-60

Note

The manufacturer reserves the right to make modifications to the product described here at

any time and without previous information.

RT-8556 Ramptester User Manual

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Content

1Safety Instructions ..................................................................................... 4

1.1 Legend of Signal Words .........................................................................................................................4

1.2 Basic Safety Instructions ........................................................................................................................5

2EU Declaration of Conformity.................................................................... 5

3General Description ................................................................................... 6

4Equipment for Test On-Site ....................................................................... 6

5Test Procedure ........................................................................................... 7

5.1 Test Preparation .....................................................................................................................................7

5.2 Bearing Accuracy Measurement ..........................................................................................................10

5.3 Bearing Sensitivity Measurement .........................................................................................................12

5.4 Audio Test.............................................................................................................................................14

6Product Disposal ...................................................................................... 16

6.1 Disposal within the European Union.....................................................................................................16

6.2 Disposal outside the European Union ..................................................................................................16

7List of abbreviations ................................................................................ 17

RT-8556 Ramptester User Manual

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1 Safety Instructions

RHOTHETA Elektronik GmbH is constantly trying to keep the safety standard of their

products up to date and to offer their customers the highest possible level of safety.

RHOTHETA products are designed and tested in accordance with the valid safety

regulations. The compliance with these standards is continuously monitored by our quality

assurance system.

This product is tested and left the factory in perfect technical and safety-relevant condition. To

maintain this condition and to ensure safe operation, the user must pay attention to all

instructions and warnings given. For any questions regarding these safety instructions,

RHOTHETA Elektronik GmbH can be contacted at any time.

The observance of the safety instructions will help to prevent personal injury or damage

caused by all kinds of dangers. This requires that the following safety instructions must be

read carefully and understood before using the product, as well as observed when using the

product. The additional safety instructions such as for protecting persons appear in relevant

parts of the product documentation and must also be paid attention to.

In addition, itisthe responsibility ofthe user to use the product appropriately. The

RT-8556 ramptester may not be used in any way that results in personal injury or property

damage.

The use of this product other than its designated purpose or in disregard of the instructions of

the manufacturer is the responsibility of the user. The manufacturer takes no responsibility for

the misuse of the product.

The manufacturer is not liable beyond the scope of legal rules!

1.1 Legend of Signal Words

Note

This symbol designates tips or additional notes that must be paid attention to and make

work easier.

Caution

Means that ignoring the instructions may lead to property damage or loss of data.

Warning

Means that ignoring the instructions, there may be a danger to health or life.

RT-8556 Ramptester User Manual

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1.2 Basic Safety Instructions

Caution

Read and observe the following instructions, warnings and safety guidelines from

the manufacturer!

•At all times, the local or national safety and accident prevention regulations must be

observed.

•When installing or operating with the product, always follow the manufacturer's instructions.

•Only place the product on appropriate locations.

•Do not expose the product to environmental conditions (heat, humidity, wind load etc.) that

exceed the specified conditions in the manuals.

•Use only the manufacturer prescribed components and/or use only recommended

materials and do not change them. Any other use or unauthorized modifications to the

product will void the authorization to operate it.

•Connect only approved accessories kits or additional equipment.

•Ensure that the connections with information technology equipment, e.g. industrial

computers, comply with the IEC 62368-1 standard that applies in each case.

•The product may only be opened by authorized service personnel.

2 EU Declaration of Conformity

Hereby RHOTHETA Elektronik GmbH declares that the product RT-8556 Ramptester

(Basic Equipment) is in compliance with the essential requirements and other relevant

provisions of:

•Directive 2011/65/EU on the restriction of the use of certain hazardous substances in

electrical and electronic equipment

The full text of the Declaration of Conformity can be found at:

http:// www.rhotheta.com

The EU Declaration of the Optional Equipment is on request available at RHOTHETA

Elektronik GmbH or directly at the manufacturer of the Optional Equipment.

RT-8556 Ramptester User Manual

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3 General Description

The RT-8556 ramptester is aDF (direction finder) performance measurement equipment

designed for quick test and maintenance of the RT-400, RT-500-M, and RT-800 radio

direction finder systems (RDFs). The ramptester consists of the antenna measurement

device (ramptester itself) and an optional RF signal generator, which allows tests on any

desired frequencies in the RT-8556 defined frequency range. The antenna measurement

device allows the bearing testing in 45° steps and can be simply attached to the

RT-400/RT-500-M/RT-800 AU (antenna unit). Thus, the RT-8556 ramptester provides an

extensive and convenient performance test of the direction finder installed on a vessel,

which includes the bearing accuracy, bearing sensitivity and audio modulation tests on

every customer desired frequency channel.

4 Equipment for Test On-Site

Device under test is the RT-400 / RT-500-M / RT-800 direction finder.

•Antenna unit (AU)

Basic Equipment:

•RT-8556 ramptester

(antenna measurement device)

•RF cable

•User manual

•Test protocol template

Optional Equipment:

•RF Signal Generator

-PN RT-14400WP

-Freq: 35-4400 MHz

-Level: -80 to +10dBm

-Battery, charging circuit

-Cables

-Carrying case

RT-8556 Ramptester User Manual

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5 Test Procedure

5.1 Test Preparation

•Assemble the ramptester in two steps:

1. Connect the measuring ring of the ramptester to the handle tube at the position

of the groove and fix the parts with the knurled screws.

2. Then screw the two dipole radiators into the corresponding threads.

•Mount the ramptester on the DF antenna unit.

Basically,the three guide pieces (brackets) must be on top.

RT-8556 Ramptester User Manual

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Standard mounting: Upside-down mounting:

1. Loosen the knurled screws in the three guide pieces of the measuring ring and

push the guide pieces outwards.

2. Loosen the knurled screw on the clamping piece. Impose the ramptester on the

antenna unit (AU).Pull on the handles ofthe clamping piece (it has a built-in

spring) and release as soon as the clamping piece is placed under the antenna

ring. Turn the measuring ring so that the locking piece of the clamping piece is

at the180° position and the dipole antenna is at the 0° position.

locking piece

0° mark

handles of

clamping piece

RT-8556 Ramptester User Manual

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3. Press the three guide pieces (brackets) against the antenna and tighten the

knurled screws.

4. Now you can turn the measuring ring on the handle tube and the ramptester

remains fixed to the antenna, the locking function of the clamping piece allows

exact 45°-steps.

•Ensure that the DF is switched on (for the audio test (s. 5.4) use either the

external speaker or connect the DCU to the audio system ofthe vessel).

•Connect the RT-14400WP generator - or another signal generator that fulfills the

requirements ofthe test procedure - with theramptester.

RF-signal feeding

RT-8556 Ramptester User Manual

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5.2 Bearing Accuracy Measurement

Test Procedure: Bearing Accuracy

Nr. Procedure Setting

1 Set the DF frequency to the desired frequency.

2 Set the signal generator frequency to the measurement frequency.

Depending on purchased frequency

options available on the DF, RHOTHETA

recommendstesting of following

frequencies. Additional frequencies can be

tested on demand.

VHF Air Band 121,500 MHz

VHF Maine Band 156,800 MHz

Military Air Band 243,000 MHz

COSPAS-SARSAT 406,025 MHz

3 Set the generator level. -30 dBm

4 Set the generator modulation.

AM = OFF

FM = OFF

5 Adjust the ramptester to the 0° Position.

Rotate the ramptester to each azimuth position and note the bearing results in the test

protocol.

7 Chose the next frequency and start with the first step.

Indice

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