I did some drive in shows in past few years and i hope there will be some more in next month....
Anyway, here i can get temporarly licence for drive-in transmitter at very cheap cost and is legal. You need to apply some three weeks in advance and check for clear frequency, than you pass location data, frequency etc data in request to regulatory angency and if everything is ok they send you licence with parametres and some fee to pay
From tech point of view, i always used L/C/R summed to either mono if transmitter is mono or stereo like L+C, R+C. In not rate ocasion i notticed that mono is best way to ho, because car systems (speakers placement, some audio processing etc inside of car) are "doing" something to audio you don't want to have while listening dialogue. Some classic compresson was added on main mix to keep max modulation of transmitter up to 75khz, because some radio hates to get clipped. And plus extra compresson on C channel before mixing so you can raise dialogue level, so in case some music etc on L/R, Center will not be masked by other.
As for other processing like optimod, omnia, bw etc i think is not needed at all, while i was working on radio station, it quite different story than to pass clear signal to listener cars, and most of todays fm broadcast processor will sound soooo boosted, which on other hand is go for fm radio.
Mainly i have used half lambda dipole and 50 or 100mW by licence which is enought to cover field like footbal field with good signal without interference. Tried also some cheap to $100 china ebay transmitters but they are no go, since most, like 90% are based upon small bh1441 ic intended for wireless headphones. So either i used professional fm tx, or my own tx i developed back in days with pll and 1w output.
BW is great unit or either some used pro rvr, elenos fm exciter you can find, it cost something like $300 but it will not give you any problems or interference during show.
Anyway, here i can get temporarly licence for drive-in transmitter at very cheap cost and is legal. You need to apply some three weeks in advance and check for clear frequency, than you pass location data, frequency etc data in request to regulatory angency and if everything is ok they send you licence with parametres and some fee to pay
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From tech point of view, i always used L/C/R summed to either mono if transmitter is mono or stereo like L+C, R+C. In not rate ocasion i notticed that mono is best way to ho, because car systems (speakers placement, some audio processing etc inside of car) are "doing" something to audio you don't want to have while listening dialogue. Some classic compresson was added on main mix to keep max modulation of transmitter up to 75khz, because some radio hates to get clipped. And plus extra compresson on C channel before mixing so you can raise dialogue level, so in case some music etc on L/R, Center will not be masked by other.
As for other processing like optimod, omnia, bw etc i think is not needed at all, while i was working on radio station, it quite different story than to pass clear signal to listener cars, and most of todays fm broadcast processor will sound soooo boosted, which on other hand is go for fm radio.
Mainly i have used half lambda dipole and 50 or 100mW by licence which is enought to cover field like footbal field with good signal without interference. Tried also some cheap to $100 china ebay transmitters but they are no go, since most, like 90% are based upon small bh1441 ic intended for wireless headphones. So either i used professional fm tx, or my own tx i developed back in days with pll and 1w output.
BW is great unit or either some used pro rvr, elenos fm exciter you can find, it cost something like $300 but it will not give you any problems or interference during show.
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