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Which of these is the least likely to be the effect of interference from an SSB amateur transmitter?
A digital TV picture becomes jerky
A digital TV picturefreezes
Clear speech from the amateur can be picked up on Hi-Fi speakers
Distorted speech from the amateur can be heard on Hi-Fi speakers.
Which of these is true of interference from a vehicle ignition system?
A whining sound on a domestic radio
A series of non-regular clicks on a domestic radio
Shadowing on an analogue TV image
A buzzing sound on a domestic radio
Mast head and downlead TV amplifiers can result in interference across all TV channels from an amateur transmission because:
Harmonics of the amateur transmission fall on TV frequencies which are amplified by the Tv amplifier
The amplifiers are broad band and amplify amateur frequencies as well as TV frequencies causing overload of the amplifier.
The coax of the TV system carries power to the TV amplifier which resonates with bypass capacitors to create a tuned circuit on amateur frequencies.
TV and downlead TV amplifiers are located high up where amateur signals are stronger
Interference can be reduced by using a number of techniques at the TV receiver end. Which of these would be least effective?
Reducing the number of elements on the TV antenna
Wrapping the mains lead round a ferrite core
Wrapping the antenna lead round a ferrite core
Using a high pass filter between the coax and the TV
If transmitting into a dummy still leads to interference on a neighbours TV it can be concluded that:
The interference is carried through the air
The interference is carried along the mains
The transmitter low pass filter is not tuned correctly