BasicB-003-011-001
What does chirp mean?
C
Answer
Basic radio theory
Type
A
An overload in a receiver's audio circuit whenever CW is received
B
A slow change in transmitter frequency as the oscillator warms up
C
A small change in the output frequency of a transmitter each time a dit or dah is sent
D
A high-pitched tone which is received along with every CW dit and dah
Answer Notes
"Chirp" is an undesirable effect in CW (Morse code) transmissions where the oscillator frequency shifts slightly the exact moment the transmitter is keyed.
This slight frequency shift creates a distinct, changing audio pitch at the receiving end, sounding much like a bird's chirp, rather than a steady, clean tone.
It is distinct from a slow frequency drift caused by an oscillator warming up, and it is unrelated to audio overload or high-pitched receiver tones. Chirp is specifically tied to the momentary keying of the transmitter.
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When receiving CW, which of these frequency ranges is optimum for a band-pass filter?
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What can be done to keep a CW transmitter from chirping?