% FILENAME = N24.TXT % Practical Operating Knowledge % Release version 2, January 00 %QUESTION: 1 #24.1 You are mobile and talking through a VHF repeater. The other station reports that you keep "dropping out". This means: your signal is drifting lower in frequency your signal does not have enough strength to operate the repeater your voice is too low-pitched to be understood you are not speaking loudly enough % ans 2 %QUESTION: 2 #24.2 A "pileup" is: an old, worn-out radio another name for a junkbox a large group of stations all calling the same DX station a type of selenium rectifier % ans 3 %QUESTION: 3 #24.3 "Break-in keying" means: unauthorised entry has resulted in station equipment disappearing temporary emergency operating key-down changes the station to transmit, key-up to receive the other station's keying is erratic % ans 3 %QUESTION: 4 #24.4 A repeater operating with a "positive 600 kHz split": listens on a frequency 600 kHz higher than its designated frequency transmits on a frequency 600 kHz higher than its designated frequency transmits simultaneously on its designated frequency and one 600 kHz higher uses positive modulation with a bandwidth of 600 kHz % ans 1 %QUESTION: 5 #24.5 The standard frequency offset (split) for 2 metre repeaters in New Zealand is: plus 600 kHz above 147 MHz, minus 600 kHz on or below 147 MHz plus 600 kHz below 147 MHz, minus 600 kHz on or above 147 MHz minus 5 MHz below 147 MHz, plus 5 MHz kHz on or above 147 MHz plus 5 MHz below 147 MHz, minus 5 MHz kHz on or above 147 MHz % ans 1 %QUESTION: 6 #24.6 The standard frequency offset (split) for 70 cm repeaters in New Zealand is plus or minus: 600 kHz 1 MHz 2 MHZ 5 MHz % ans 4 %QUESTION: 7 #24.7 You are adjusting an antenna matching unit using an SWR bridge. You should adjust for: maximum reflected power equal reflected and transmitted power minimum reflected power minimum transmitted power % ans 3 %QUESTION: 8 #24.8 The "squelch" or "muting" circuitry on a VHF receiver: inhibits the audio output unless a station is being received compresses incoming voice signals to make them more intelligible reduces audio burst noise due to lightning emissions reduces the noise on incoming signals % ans 1 %QUESTION: 9 #24.9 The "S meter" on a receiver: indicates where the squelch control should be set indicates the standing wave ratio indicates the state of the battery voltage indicates relative incoming signal strengths % ans 4 %QUESTION: 10 #24.10 The "National System" is: the legal licensing standard of Amateur operation in New Zealand a series of nationwide amateur radio linked repeaters in the 70 cm band the official New Zealand repeater band plan A nationwide emergency communications procedure % ans 2 %QUESTION: 11 #24.11 A noise blanker on a receiver is most effective to reduce: 50 Hz power supply hum noise originating from the mixer stage of the receiver ignition noise noise originating from the RF stage of the receiver. % ans 3 %QUESTION: 12 #24.12 The purpose of a VOX unit in a transceiver is to: change from receiving to transmitting using the sound of the operator's voice check the transmitting frequency using the voice operated crystal enable a volume operated extension speaker for remote listening enable the variable oscillator crystal % ans 1 %QUESTION: 13 #24.13 "VOX" stands for: volume operated extension speaker voice operated transmit variable oscillator transmitter voice operated expander % ans 2 %QUESTION: 14 #24.14 "RIT" stands for: receiver interference transmuter range independent transmission receiver incremental tuning random interference tester % ans 3 %QUESTION: 15 #24.15 The "RIT" control on a transceiver: reduces interference on the transmission changes the frequency of the transmitter section without affecting the frequency of the receiver section changes the transmitting and receiver frequencies by the same amount changes the frequency of the receiver section without affecting the frequency of the transmitter section % ans 4 %QUESTION: 16 #24.16 The "split frequency" function on a transceiver allows the operator to: transmit on one frequency and receive on another monitor two frequencies simultaneously using a single loudspeaker monitor two frequencies simultaneously using two loudspeakers receive CW and SSB signals simultaneously on the same frequency % ans 1 %QUESTION: 17 #24.17 The term "ALC" stands for: audio limiter control automatic level control automatic loudness control automatic listening control % ans 2 %QUESTION: 18 #24.18 The AGC circuit is to: expand the audio gain limit the extent of amplitude generation minimise the adjustments needed to the receiver gain control knobs amplitude limit the crystal oscillator output % ans 3 %QUESTION: 19 #24.19 Many receivers have both RF and AF gain controls. These allow the operator to: vary the receiver frequency and AM transmitter frequency independently vary the low and high frequency audio gain independently vary the receiver's "real" and "absolute" frequencies independently vary the gain of the radio frequency and audio frequency amplifier stages independently % ans 4 %QUESTION: 20 #24.20 The term "PTT" means: push to talk piezo-electric transducer transmitter phase testing terminal phased transmission transponder % ans 1