what is the gang in tuner spec??

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#2
I think a gang is a section in variable capacitor used to tune to chosen frequency. More gangs - more selectivity methinks, but I'm not really into radio technology 🙂
Not relevant in "digital" tuners (ones with frequency synthesis, not real DAB tuners).
 
#4
ilpizigi said:
what is the gang in tuner spec?

According to the O.Manual, They mentioned about "4gang 50US Tuner pack"" What is the mean?
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Yes, they are the sections of the tuning capacitor and are "all ganged together". Each gang would be drawn in the schematic as another capacitor section. A 4 gang cap has 4 variable capacitors on one shaft.

Each section allows the front end another tuning peak and some more skirt rolloff, so more gangs equals more tuning selectivity and a better ability to seperate a weak signal from the powerhouse next door.

With 4 gangs, 1 gang will be used for the oscillator (always) and the remaining 3 would give 3 tuned circuits. More gangs should be better but there are diminishing returns so no need to go crazy. 4 or 5 can be quite decent.

50us (microseconds) is the hf rolloff as used in Europe (US is 75us).

Trivia question: they are called gangs because in the 1920s a radio might have 3 tuning capacitors with their own knobs. You only received a station if you could get all three in the same exact position, like cracking a safe! "Ganging" them together was a high tech breakthrough.

David S.
 
#5
Two different selectivity issues here. The number of front-end tuning gangs affects the front-end VHF selectivity, which helps protect the mixer stage from strong signals a few MHz away (or more) from the desired signal. This also reduces image interference from another band.

Protection from nearby channels up to a MHz or so away is done by the IF selectivity which has nothing to to do with the front-end gangs.
 
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