VU2YAM
http://www.niar.org/Aila%20Report.pdf
http://www.niar.org/Aila%20Report.pdf
Saturday, August 27, 2011
ASOC - Qn papers
GOVERNMENT OF INDIA
MINISTRY OF COMMUNICATIONS
MONITORING ORGANIZATION
* * * * * * * *
NOTE: Question No 1 from each section is compulsory.
Grade I answer any 5 of the remaining questions - 2 Hours
Grade II answer any 2 of the remaining questions - 1 Hour
SECTION A
Q.1. Choose the correct answer ( any 10 )
i) A3E indicates a) SSB b) AM-DSB voice c) FM Voice d) FSK
ii) Capacitance is measured in
a) Amperes b) watt c) Farad d) Coulombs
iii) Frequency is a) cycles per second b) Kilo cycles
per second c) Cycles per minute d) cycles per hour
iv) Line of sight propagation is the mode of communication
in a) LF b) HF c) MF d) VHF
v) The wavelength of 300 MHz is in Meters is
a) 1 b) .1 c) 1.1 d) 0.01
vi) 4th harmonic of 2.5 MHz is
a) 10 MHz b) 15 MHz c) 8 MHz d) 7.5 MHz
vii) Squelch control is used to eliminate
a) static interference b) electrical disturbance
c) receiver noise d) unwanted carrier
viii) Resonant frequency in a tuned circuit is equal to
a) 1/2ãLC b) 1/2ãûLC c) 2ãûLC d) 2ãûL+C
ix) Power dissipated in a 400 Ohm resistor at 1 Amp is
a) 40 Watts b) 400 KW c) 4 Watts d) 400 Watts
x) The frequency of 40 Meter band in MHz is
a) 14 - 14.350 b) 7 - 7.1 c) 21 - 21.450 d) 15 - 15.400
xi) Zener diode is used for a) Rectification b) Voltage
regulation c) Current regulation d) Switching
xii) The UHF range is a) 30 to 300 KHz b) 300 to 3000 KHz
c) 3 to 30 GHz d) 300 to 3000 MHz
Q.2 Write short notes on any three a) Skip distance
b) AVC c) eddy currents d) Antenna matching
Q.3 Draw the circuit of a full wave bridge rectifier with
and smoothing circuit and explain its function.
Q.4 a) Explain briefly FM and its advantages over AM
b) Explain briefly dipole aerial
Q.5 Draw the block diagram of a superhetrodyne receiver
and explain the function of each stage briefly.
Q.6 Explain briefly primary cell and secondary cell and
how do they differ ?
Q.7 State the color code of resistors
SECTION B
Q.1. Choose the correct answer ( any 10 )
i) Indian amateurs can communicate with other amateurs in
a) All countries b) Countries permitted by ITU
c) Countries permitted by Indian Government
d) Countries permitted by Indian Amateur society
ii) Grade II amateurs can communicate on 7 MHz in
a) A1 b) A3 c) F3 d) A3A
iii) Lady amateurs are known as a) XL b) XYL c) YL d) LY
iv) Minimum age to become an amateur is
a) 18 years b) 14 years c) 12 years d) 16 years
v) All timing in the Log book should be in
a) IST b) UTC c) GMT d) Local time
vi) Amateurs should preserve their log for a period of
a) 6 months b) 1 year c) 2 years d) 9 months from the
date of the last entry
vii) Q code to indicate time is a) QRG b) QRX c) QTR d) QSA
viii) Test signal shall not be continued more than
a) 30 seconds b) 1 minute c) 2 minutes d) 3 minutes
ix) In India the standard time signal is broadcast by
a) ISRO b) WPC c) OCS d) NPL
x) PANPAN transmitted thrice indicates a) Distress
b) Emergency c) Urgency d) Distress and emergency
xi) The broadcast of music is allowed in amateur service
a) on request b) when channel is free c) never
d) only for testing
__
xii) The abbreviation VA means a) End of transmission
b) End of message c) End of working d) End of schedule
Q.2 State the conditions under which an amateur station
can transmit third party messages ?
Q.3 Write the meaning of four of the following i) QRA
ii) QRL iii) QRX 1600 iv) QRM v) QSY
Q.4 What are the international distress frequencies and
write a specimen form of a distress message in A3.
Q.5a. Explain the need for a callsign ? How are the callsigns
for amateurs in India formed ?
5b. Who allots callsigns for amateurs in India ?
Q.6 On May 27 1986 Tuesday presume you had a contact
Sri Vidyaprakash of Coimbatore on 14025 KHz signing
VU2DVP at 2130 IST with good signal strength, tone and
readability. Convey your particulars to him before
closing down. Show the above contact in proper log form.
Q.7 What types of messages are the amateurs forbidden to
transmit ?
Thursday, August 25, 2011
Wednesday, August 24, 2011
Amateur Radio _revised Guidelines
The revised guidelines and clarification in the context of Indian Wireless Telegraph(Amateur Service) Amendment Rules,2009 dated 1st April and Indian Wireless Telegraph(Amateur Service) Amendment Rules 2005 dated 9th June 2005
Circular dated 13-08-2010
Tuesday, August 23, 2011
Channel Assignments
The channel assignments in India are different from the bandplans used elsewhere. The Indian bandplan consists of 40 frequencies spaced a relatively tight eight kHz apart, plus a few offset channels used for mountaineering and radio-controlled devices. Also, many of the channels are reserved for specific purposes such as forestry, disaster relief, and sporting events. For More Info Visit http://www.wpc.dot.gov.in/
| Frequency | Usage |
|---|---|
| 26.964 | Hobbyist comms |
| 26.968 [offset] | Mountaineering |
| 26.972 | Hobbyist comms |
| 26.976 [offset] | Mountaineering |
| 26.980 | Highway comms |
| 26.988 | spare |
| 26.996 | spare |
| 27.004 | Radio-controlled model aircraft |
| 27.012 | Rural comms |
| 27.020 | Radio-controlled devices, ex. garage door openers, alarms |
| 27.028 | Rural comms |
| 27.036 | Hobbyist comms |
| 27.044 | Highway emergency ( to contact police ) |
| 27.052 | Highway emergency ( to contact EMS ) |
| 27.060 | Marine lifesaving comms |
| 27.068 | Marine lifesaving comms |
| 27.076 | Disaster relief |
| 27.084 | Disaster relief |
| 27.092 | Forestry |
| 27.100 | Forestry |
| 27.108 | Radio-controlled devices, ex. garage door openers, alarms |
| 27.116 | Radio-controlled model aircraft |
| 27.124 | Hobbyist comms |
| 27.132 | spare |
| 27.140 | Mountaineering |
| 27.148 | Radio-controlled model aircraft |
| 27.155 [offset] | Radio-controlled models, general |
| 27.156 | Radio-controlled model aircraft |
| 27.164 | spare |
| 27.172 | Rural comms |
| 27.180 | spare |
| 27.188 | spare |
| 27.196 | spare |
| 27.204 | Mountaineering |
| 27.212 | Rural comms |
| 27.220 | Sports events |
| 27.225 [offset] | Radio-controlled models, general |
| 27.228 | Radio-controlled model aircraft |
| 27.236 | Highway comms |
| 27.244 | Sports events |
| 27.250 [offset] | Radio-controlled toys and gadgets |
| 27.252 | spare |
| 27.260 | Radio-controlled toys and gadgets |
| 27.268 | spare |
| 27.276 | spare |
Monday, August 22, 2011
Amateur radio, often called ham radio, is a service that uses various types of radio communications equipment to communicate with other radio amateurs for public service, recreation and self-training. A participant is called an amateur radio operator, or a ham.
Amateur radio operators have personal wireless communications with friends, family members, and even complete strangers, and often support their communities with emergency and disaster communications while increasing their personal knowledge of electronics and radio theory. An estimated six million people throughout the world are regularly involved with amateur radio.
The term "amateur" is not a reflection on the skills of the participants, which are often quite advanced; rather, "amateur" indicates that amateur radio communications are not allowed to be made for commercial or money-making purposes.
Though its origins can be traced to at least the late 1800s, amateur radio, as practiced today, began in the 1920s. As with radio in general, the birth of amateur radio was strongly associated with various amateur experimenters and hobbyists. Throughout its history, amateur radio enthusiasts have made significant contributions to science, engineering, industry, and social services. Research by amateur radio operators has founded new industries, built economies, empowered nations, and saved lives in times of emergency.
Radio amateurs use various modes of transmission to communicate. Voice transmissions are most common, with some such as frequency modulation (FM) offering high quality audio, and others such as single sideband (SSB) offering more reliable communications when signals are marginal and band width is restricted.
Radiotelegraphy using Morse code remains popular, particularly on the shortwave bands and for experimental work such as Moonbounce, with its inherent signal-to-noise ratio advantages. Morse, using internationally agreed code groups, also facilitates communications between amateurs who speak different languages. It is also popular with homebrewers as CW-only transmitters are simpler to construct. For many years, demonstrating a proficiency in Morse code was a requirement to obtain amateur licenses for the high frequency bands, but following changes in international regulations in 2003, many countries have now dropped this requirement (the United States Federal Communications Commission did so in 2007)Modern personal computers have led to a boom in digital modes such as radio teletype, which previously required cumbersome mechanical equipment. Hams led the development of packet radio, which has even used protocols such as TCP/IP since the 1970s. This has since been augmented by more specialized modes such as PSK31 to facilitate real-time, low-power communications on the shortwave bands. 'Echolink' using Voice over IP technology has enabled amateurs to communicate through local internet-connected repeaters and radio nodes, while IRLP has allowed easy linking together of repeaters.
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