Thesis (M.Diploma in Technology)--Cape Technikon, 1993 / This thesis describes the development of a 5-Tone Zentral
Verband Electrotechische Industrie eZVEI) Encoder
Analyser. The 5-Tone ZVEI Encoder Analyser is used by the
Radio Section of the Test and Metering Branch, which falls
under the Electricity Department of the Cape Town City
Council.
It assists the Quality Assurance Technician in determining
whether the 5 tone ZVEI encoder, of the radio under test,
is operating within the manufacturers specifications.
Various manufacturers of radio equipment tender for the
supply of mobile radios fitted with ZVEI tone
The Radio Section are now capable of testing
encoders.
all the
various radios and comparing the analysed ZVEI
specifications of each manufacturer's radio. The results
can be used to assist management in deciding which radio
would be the most suitable for purchasing.
The development of the 5-Tone ZVEI Encoder Analyser
involved the design and development of hardware and
software. It was designed to be housed in a compact
enclosure and to interface to a Motorola Communications
System Analyser Model R-2001C. The RF output, from the
radio under test, connects to the RF input of the
Communications System Analyser. The demodulated output of
the Communications System Analyser connects to the input
of the 5-Tone ZVEI Encoder Analyser.
The softwa~e was designed using PLM-51 high level language
to p~ovide ~eal-time analysis of va~ious selective-calls
(selcalls) ~eceived f~om the demodulated output of the
Communications System Analyser. Once all 5 tones of the
ZVEI selcall have been analysed the software background
task is flagged and the analysed results a~e displayed as
various MODES of display on a 16 cha~acte~ by 4 line dot
matrix display.
The following parameters of the ZVEI selcall a~e analysed:
i) Frequency Digits.
ii) Frequency fo~ each of the 5 tones.
iii) Tone Duration for each of the 5 tones.
iv) Frequency Error for the 5 tones.
v) Tone Duration Er~or for the 5 tones.
The design and development of the 5-Tone ZVEI Encode~
Analyser was conducted at the Computer Section of the
Electricity Depa~tment, Cape Town City Council.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:cput/oai:localhost:20.500.11838/1141 |
| Date | January 1993 |
| Creators | Wilson, Brian George |
| Publisher | Cape Technikon |
| Source Sets | South African National ETD Portal |
| Language | English |
| Detected Language | English |
| Type | Thesis |
| Rights | http://creativecommons.org/licenses/by-nc-sa/3.0/za/ |
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