Most European RF-modulators are tunable on UHF, channels 21 - 69.
The modulator passes the antenna signal and adds one channel. It doesn't switch the antenna signal off, so you can still watch any broadcast channel.
Thanks Thomas. I see how it works now.
D
Tunable UHF modulator output. OK. Here in the US, if the modulator is active, all other signals are blocked. And our modulators are on low VHF, channel 3 or 4.
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