what is the gang in tuner spec??

[ilpizigi]

what is the gang in tuner spec?

According to the O.Manual, They mentioned about "4gang 50US Tuner pack"" What is the mean?

[mbar]

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).

[adason]

you can read more about gangs in fm tuners here:
Tuner Information Center - Vintage Stereo Tuners

[speaker dave]

Originally Posted by ilpizigi

what is the gang in tuner spec?

According to the O.Manual, They mentioned about "4gang 50US Tuner pack"" What is the mean?

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.

[DF96]

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.